includes/GlobalFunctions.php

   1 <?php
   2
   3 if ( !defined( 'MEDIAWIKI' ) ) {
   4         die( "This file is part of MediaWiki, it is not a valid entry point" );
   5 }
   6
   7 /**
   8  * Global functions used everywhere
   9  */
  10
  11 require_once dirname(__FILE__) . '/normal/UtfNormalUtil.php';
  12
  13 // Hide compatibility functions from Doxygen
  14 /// @cond
  15
  16 /**
  17  * Compatibility functions
  18  *
  19  * We more or less support PHP 5.0.x and up.
  20  * Re-implementations of newer functions or functions in non-standard
  21  * PHP extensions may be included here.
  22  */
  23 if( !function_exists('iconv') ) {
  24         # iconv support is not in the default configuration and so may not be present.
  25         # Assume will only ever use utf-8 and iso-8859-1.
  26         # This will *not* work in all circumstances.
  27         function iconv( $from, $to, $string ) {
  28                 if(strcasecmp( $from, $to ) == 0) return $string;
  29                 if(strcasecmp( $from, 'utf-8' ) == 0) return utf8_decode( $string );
  30                 if(strcasecmp( $to, 'utf-8' ) == 0) return utf8_encode( $string );
  31                 return $string;
  32         }
  33 }
  34
  35 if ( !function_exists( 'mb_substr' ) ) {
  36         /**
  37          * Fallback implementation for mb_substr, hardcoded to UTF-8.
  38          * Attempts to be at least _moderately_ efficient; best optimized
  39          * for relatively small offset and count values -- about 5x slower
  40          * than native mb_string in my testing.
  41          *
  42          * Larger offsets are still fairly efficient for Latin text, but
  43          * can be up to 100x slower than native if the text is heavily
  44          * multibyte and we have to slog through a few hundred kb.
  45          */
  46         function mb_substr( $str, $start, $count='end' ) {
  47                 if( $start != 0 ) {
  48                         $split = mb_substr_split_unicode( $str, intval( $start ) );
  49                         $str = substr( $str, $split );
  50                 }
  51
  52                 if( $count !== 'end' ) {
  53                         $split = mb_substr_split_unicode( $str, intval( $count ) );
  54                         $str = substr( $str, 0, $split );
  55                 }
  56
  57                 return $str;
  58         }
  59
  60         function mb_substr_split_unicode( $str, $splitPos ) {
  61                 if( $splitPos == 0 ) {
  62                         return 0;
  63                 }
  64
  65                 $byteLen = strlen( $str );
  66
  67                 if( $splitPos > 0 ) {
  68                         if( $splitPos > 256 ) {
  69                                 // Optimize large string offsets by skipping ahead N bytes.
  70                                 // This will cut out most of our slow time on Latin-based text,
  71                                 // and 1/2 to 1/3 on East European and Asian scripts.
  72                                 $bytePos = $splitPos;
  73                                 while ($bytePos < $byteLen && $str{$bytePos} >= "\x80" && $str{$bytePos} < "\xc0")
  74                                         ++$bytePos;
  75                                 $charPos = mb_strlen( substr( $str, 0, $bytePos ) );
  76                         } else {
  77                                 $charPos = 0;
  78                                 $bytePos = 0;
  79                         }
  80
  81                         while( $charPos++ < $splitPos ) {
  82                                 ++$bytePos;
  83                                 // Move past any tail bytes
  84                                 while ($bytePos < $byteLen && $str{$bytePos} >= "\x80" && $str{$bytePos} < "\xc0")
  85                                         ++$bytePos;
  86                         }
  87                 } else {
  88                         $splitPosX = $splitPos + 1;
  89                         $charPos = 0; // relative to end of string; we don't care about the actual char position here
  90                         $bytePos = $byteLen;
  91                         while( $bytePos > 0 && $charPos-- >= $splitPosX ) {
  92                                 --$bytePos;
  93                                 // Move past any tail bytes
  94                                 while ($bytePos > 0 && $str{$bytePos} >= "\x80" && $str{$bytePos} < "\xc0")
  95                                         --$bytePos;
  96                         }
  97                 }
  98
  99                 return $bytePos;
 100         }
 101 }
 102
 103 if ( !function_exists( 'mb_strlen' ) ) {
 104         /**
 105          * Fallback implementation of mb_strlen, hardcoded to UTF-8.
 106          * @param string $str
 107          * @param string $enc optional encoding; ignored
 108          * @return int
 109          */
 110         function mb_strlen( $str, $enc="" ) {
 111                 $counts = count_chars( $str );
 112                 $total = 0;
 113
 114                 // Count ASCII bytes
 115                 for( $i = 0; $i < 0x80; $i++ ) {
 116                         $total += $counts[$i];
 117                 }
 118
 119                 // Count multibyte sequence heads
 120                 for( $i = 0xc0; $i < 0xff; $i++ ) {
 121                         $total += $counts[$i];
 122                 }
 123                 return $total;
 124         }
 125 }
 126
 127
 128 if( !function_exists( 'mb_strpos' ) ) {
 129         /**
 130          * Fallback implementation of mb_strpos, hardcoded to UTF-8.
 131          * @param $haystack String
 132          * @param $needle String
 133          * @param $offset String: optional start position
 134          * @param $encoding String: optional encoding; ignored
 135          * @return int
 136          */
 137         function mb_strpos( $haystack, $needle, $offset = 0, $encoding="" ) {
 138                 $needle = preg_quote( $needle, '/' );
 139
 140                 $ar = array();
 141                 preg_match( '/'.$needle.'/u', $haystack, $ar, PREG_OFFSET_CAPTURE, $offset );
 142
 143                 if( isset( $ar[0][1] ) ) {
 144                         return $ar[0][1];
 145                 } else {
 146                         return false;
 147                 }
 148         }
 149 }
 150
 151 if( !function_exists( 'mb_strrpos' ) ) {
 152         /**
 153          * Fallback implementation of mb_strrpos, hardcoded to UTF-8.
 154          * @param $haystack String
 155          * @param $needle String
 156          * @param $offset String: optional start position
 157          * @param $encoding String: optional encoding; ignored
 158          * @return int
 159          */
 160         function mb_strrpos( $haystack, $needle, $offset = 0, $encoding = "" ) {
 161                 $needle = preg_quote( $needle, '/' );
 162
 163                 $ar = array();
 164                 preg_match_all( '/'.$needle.'/u', $haystack, $ar, PREG_OFFSET_CAPTURE, $offset );
 165
 166                 if( isset( $ar[0] ) && count( $ar[0] ) > 0 &&
 167                     isset( $ar[0][count($ar[0])-1][1] ) ) {
 168                         return $ar[0][count($ar[0])-1][1];
 169                 } else {
 170                         return false;
 171                 }
 172         }
 173 }
 174
 175 // Support for Wietse Venema's taint feature
 176 if ( !function_exists( 'istainted' ) ) {
 177         function istainted( $var ) {
 178                 return 0;
 179         }
 180         function taint( $var, $level = 0 ) {}
 181         function untaint( $var, $level = 0 ) {}
 182         define( 'TC_HTML', 1 );
 183         define( 'TC_SHELL', 1 );
 184         define( 'TC_MYSQL', 1 );
 185         define( 'TC_PCRE', 1 );
 186         define( 'TC_SELF', 1 );
 187 }
 188 /// @endcond
 189
 190
 191 /**
 192  * Like array_diff( $a, $b ) except that it works with two-dimensional arrays.
 193  */
 194 function wfArrayDiff2( $a, $b ) {
 195         return array_udiff( $a, $b, 'wfArrayDiff2_cmp' );
 196 }
 197 function wfArrayDiff2_cmp( $a, $b ) {
 198         if ( !is_array( $a ) ) {
 199                 return strcmp( $a, $b );
 200         } elseif ( count( $a ) !== count( $b ) ) {
 201                 return count( $a ) < count( $b ) ? -1 : 1;
 202         } else {
 203                 reset( $a );
 204                 reset( $b );
 205                 while( ( list( $keyA, $valueA ) = each( $a ) ) && ( list( $keyB, $valueB ) = each( $b ) ) ) {
 206                         $cmp = strcmp( $valueA, $valueB );
 207                         if ( $cmp !== 0 ) {
 208                                 return $cmp;
 209                         }
 210                 }
 211                 return 0;
 212         }
 213 }
 214
 215 /**
 216  * Seed Mersenne Twister
 217  * No-op for compatibility; only necessary in PHP < 4.2.0
 218  */
 219 function wfSeedRandom() {
 220         /* No-op */
 221 }
 222
 223 /**
 224  * Get a random decimal value between 0 and 1, in a way
 225  * not likely to give duplicate values for any realistic
 226  * number of articles.
 227  *
 228  * @return string
 229  */
 230 function wfRandom() {
 231         # The maximum random value is "only" 2^31-1, so get two random
 232         # values to reduce the chance of dupes
 233         $max = mt_getrandmax() + 1;
 234         $rand = number_format( (mt_rand() * $max + mt_rand())
 235                 / $max / $max, 12, '.', '' );
 236         return $rand;
 237 }
 238
 239 /**
 240  * We want some things to be included as literal characters in our title URLs
 241  * for prettiness, which urlencode encodes by default.  According to RFC 1738,
 242  * all of the following should be safe:
 243  *
 244  * ;:@&=$-_.+!*'(),
 245  *
 246  * But + is not safe because it's used to indicate a space; &= are only safe in
 247  * paths and not in queries (and we don't distinguish here); ' seems kind of
 248  * scary; and urlencode() doesn't touch -_. to begin with.  Plus, although /
 249  * is reserved, we don't care.  So the list we unescape is:
 250  *
 251  * ;:@$!*(),/
 252  *
 253  * However, IIS7 redirects fail when the url contains a colon (Bug 22709),
 254  * so no fancy : for IIS7.
 255  *
 256  * %2F in the page titles seems to fatally break for some reason.
 257  *
 258  * @param $s String:
 259  * @return string
 260 */
 261 function wfUrlencode( $s ) {
 262         static $needle;
 263         if ( is_null( $needle ) ) {
 264                 $needle = array( '%3B','%40','%24','%21','%2A','%28','%29','%2C','%2F' );
 265                 if (! isset($_SERVER['SERVER_SOFTWARE']) || ( strpos($_SERVER['SERVER_SOFTWARE'], "Microsoft-IIS/7") === false)) {
 266                         $needle[] = '%3A';
 267                 }
 268         }
 269
 270         $s = urlencode( $s );
 271         $s = str_ireplace(
 272                 $needle,
 273                 array( ';',  '@',  '$',  '!',  '*',  '(',  ')',  ',',  '/',  ':' ),
 274                 $s
 275         );
 276
 277         return $s;
 278 }
 279
 280 /**
 281  * Sends a line to the debug log if enabled or, optionally, to a comment in output.
 282  * In normal operation this is a NOP.
 283  *
 284  * Controlling globals:
 285  * $wgDebugLogFile - points to the log file
 286  * $wgProfileOnly - if set, normal debug messages will not be recorded.
 287  * $wgDebugRawPage - if false, 'action=raw' hits will not result in debug output.
 288  * $wgDebugComments - if on, some debug items may appear in comments in the HTML output.
 289  *
 290  * @param $text String
 291  * @param $logonly Bool: set true to avoid appearing in HTML when $wgDebugComments is set
 292  */
 293 function wfDebug( $text, $logonly = false ) {
 294         global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly, $wgDebugRawPage;
 295         global $wgDebugLogPrefix, $wgShowDebug;
 296         static $recursion = 0;
 297
 298         static $cache = array(); // Cache of unoutputted messages
 299         $text = wfDebugTimer() . $text;
 300
 301         # Check for raw action using $_GET not $wgRequest, since the latter might not be initialised yet
 302         if ( isset( $_GET['action'] ) && $_GET['action'] == 'raw' && !$wgDebugRawPage ) {
 303                 return;
 304         }
 305
 306         if ( ( $wgDebugComments || $wgShowDebug ) && !$logonly ) {
 307                 $cache[] = $text;
 308
 309                 if ( !isset( $wgOut ) ) {
 310                         return;
 311                 }
 312                 if ( !StubObject::isRealObject( $wgOut ) ) {
 313                         if ( $recursion ) {
 314                                 return;
 315                         }
 316                         $recursion++;
 317                         $wgOut->_unstub();
 318                         $recursion--;
 319                 }
 320
 321                 // add the message and possible cached ones to the output
 322                 array_map( array( $wgOut, 'debug' ), $cache );
 323                 $cache = array();
 324         }
 325         if ( $wgDebugLogFile != '' && !$wgProfileOnly ) {
 326                 # Strip unprintables; they can switch terminal modes when binary data
 327                 # gets dumped, which is pretty annoying.
 328                 $text = preg_replace( '![\x00-\x08\x0b\x0c\x0e-\x1f]!', ' ', $text );
 329                 $text = $wgDebugLogPrefix . $text;
 330                 wfErrorLog( $text, $wgDebugLogFile );
 331         }
 332 }
 333
 334 function wfDebugTimer() {
 335         global $wgDebugTimestamps;
 336         if ( !$wgDebugTimestamps ) return '';
 337         static $start = null;
 338
 339         if ( $start === null ) {
 340                 $start = microtime( true );
 341                 $prefix = "\n$start";
 342         } else {
 343                 $prefix = sprintf( "%6.4f", microtime( true ) - $start );
 344         }
 345
 346         return $prefix . '  ';
 347 }
 348
 349 /**
 350  * Send a line giving PHP memory usage.
 351  * @param $exact Bool: print exact values instead of kilobytes (default: false)
 352  */
 353 function wfDebugMem( $exact = false ) {
 354         $mem = memory_get_usage();
 355         if( !$exact ) {
 356                 $mem = floor( $mem / 1024 ) . ' kilobytes';
 357         } else {
 358                 $mem .= ' bytes';
 359         }
 360         wfDebug( "Memory usage: $mem\n" );
 361 }
 362
 363 /**
 364  * Send a line to a supplementary debug log file, if configured, or main debug log if not.
 365  * $wgDebugLogGroups[$logGroup] should be set to a filename to send to a separate log.
 366  *
 367  * @param $logGroup String
 368  * @param $text String
 369  * @param $public Bool: whether to log the event in the public log if no private
 370  *                     log file is specified, (default true)
 371  */
 372 function wfDebugLog( $logGroup, $text, $public = true ) {
 373         global $wgDebugLogGroups, $wgShowHostnames;
 374         $text = trim($text)."\n";
 375         if( isset( $wgDebugLogGroups[$logGroup] ) ) {
 376                 $time = wfTimestamp( TS_DB );
 377                 $wiki = wfWikiID();
 378                 if ( $wgShowHostnames ) {
 379                         $host = wfHostname();
 380                 } else {
 381                         $host = '';
 382                 }
 383                 wfErrorLog( "$time $host $wiki: $text", $wgDebugLogGroups[$logGroup] );
 384         } else if ( $public === true ) {
 385                 wfDebug( $text, true );
 386         }
 387 }
 388
 389 /**
 390  * Log for database errors
 391  * @param $text String: database error message.
 392  */
 393 function wfLogDBError( $text ) {
 394         global $wgDBerrorLog, $wgDBname;
 395         if ( $wgDBerrorLog ) {
 396                 $host = trim(`hostname`);
 397                 $text = date('D M j G:i:s T Y') . "\t$host\t$wgDBname\t$text";
 398                 wfErrorLog( $text, $wgDBerrorLog );
 399         }
 400 }
 401
 402 /**
 403  * Log to a file without getting "file size exceeded" signals.
 404  *
 405  * Can also log to TCP or UDP with the syntax udp://host:port/prefix. This will
 406  * send lines to the specified port, prefixed by the specified prefix and a space.
 407  */
 408 function wfErrorLog( $text, $file ) {
 409         if ( substr( $file, 0, 4 ) == 'udp:' ) {
 410                 if ( preg_match( '!^(tcp|udp):(?://)?\[([0-9a-fA-F:]+)\]:(\d+)(?:/(.*))?$!', $file, $m ) ) {
 411                         // IPv6 bracketed host
 412                         $protocol = $m[1];
 413                         $host = $m[2];
 414                         $port = intval( $m[3] );
 415                         $prefix = isset( $m[4] ) ? $m[4] : false;
 416                         $domain = AF_INET6;
 417                 } elseif ( preg_match( '!^(tcp|udp):(?://)?([a-zA-Z0-9.-]+):(\d+)(?:/(.*))?$!', $file, $m ) ) {
 418                         $protocol = $m[1];
 419                         $host = $m[2];
 420                         if ( !IP::isIPv4( $host ) ) {
 421                                 $host = gethostbyname( $host );
 422                         }
 423                         $port = intval( $m[3] );
 424                         $prefix = isset( $m[4] ) ? $m[4] : false;
 425                         $domain = AF_INET;
 426                 } else {
 427                         throw new MWException( __METHOD__.": Invalid UDP specification" );
 428                 }
 429                 // Clean it up for the multiplexer
 430                 if ( strval( $prefix ) !== '' ) {
 431                         $text = preg_replace( '/^/m', $prefix . ' ', $text );
 432                         if ( substr( $text, -1 ) != "\n" ) {
 433                                 $text .= "\n";
 434                         }
 435                 }
 436
 437                 $sock = socket_create( $domain, SOCK_DGRAM, SOL_UDP );
 438                 if ( !$sock ) {
 439                         return;
 440                 }
 441                 socket_sendto( $sock, $text, strlen( $text ), 0, $host, $port );
 442                 socket_close( $sock );
 443         } else {
 444                 wfSuppressWarnings();
 445                 $exists = file_exists( $file );
 446                 $size = $exists ? filesize( $file ) : false;
 447                 if ( !$exists || ( $size !== false && $size + strlen( $text ) < 0x7fffffff ) ) {
 448                         error_log( $text, 3, $file );
 449                 }
 450                 wfRestoreWarnings();
 451         }
 452 }
 453
 454 /**
 455  * @todo document
 456  */
 457 function wfLogProfilingData() {
 458         global $wgRequestTime, $wgDebugLogFile, $wgDebugRawPage, $wgRequest;
 459         global $wgProfiler, $wgProfileLimit, $wgUser;
 460         # Profiling must actually be enabled...
 461         if( is_null( $wgProfiler ) ) return;
 462         # Get total page request time
 463         $now = wfTime();
 464         $elapsed = $now - $wgRequestTime;
 465         # Only show pages that longer than $wgProfileLimit time (default is 0)
 466         if( $elapsed <= $wgProfileLimit ) return;
 467         $prof = wfGetProfilingOutput( $wgRequestTime, $elapsed );
 468         $forward = '';
 469         if( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
 470                 $forward = ' forwarded for ' . $_SERVER['HTTP_X_FORWARDED_FOR'];
 471         if( !empty( $_SERVER['HTTP_CLIENT_IP'] ) )
 472                 $forward .= ' client IP ' . $_SERVER['HTTP_CLIENT_IP'];
 473         if( !empty( $_SERVER['HTTP_FROM'] ) )
 474                 $forward .= ' from ' . $_SERVER['HTTP_FROM'];
 475         if( $forward )
 476                 $forward = "\t(proxied via {$_SERVER['REMOTE_ADDR']}{$forward})";
 477         // Don't unstub $wgUser at this late stage just for statistics purposes
 478         if( StubObject::isRealObject($wgUser) && $wgUser->isAnon() )
 479                 $forward .= ' anon';
 480         $log = sprintf( "%s\t%04.3f\t%s\n",
 481           gmdate( 'YmdHis' ), $elapsed,
 482           urldecode( $wgRequest->getRequestURL() . $forward ) );
 483         if ( $wgDebugLogFile != '' && ( $wgRequest->getVal('action') != 'raw' || $wgDebugRawPage ) ) {
 484                 wfErrorLog( $log . $prof, $wgDebugLogFile );
 485         }
 486 }
 487
 488 /**
 489  * Check if the wiki read-only lock file is present. This can be used to lock
 490  * off editing functions, but doesn't guarantee that the database will not be
 491  * modified.
 492  * @return bool
 493  */
 494 function wfReadOnly() {
 495         global $wgReadOnlyFile, $wgReadOnly;
 496
 497         if ( !is_null( $wgReadOnly ) ) {
 498                 return (bool)$wgReadOnly;
 499         }
 500         if ( $wgReadOnlyFile == '' ) {
 501                 return false;
 502         }
 503         // Set $wgReadOnly for faster access next time
 504         if ( is_file( $wgReadOnlyFile ) ) {
 505                 $wgReadOnly = file_get_contents( $wgReadOnlyFile );
 506         } else {
 507                 $wgReadOnly = false;
 508         }
 509         return (bool)$wgReadOnly;
 510 }
 511
 512 function wfReadOnlyReason() {
 513         global $wgReadOnly;
 514         wfReadOnly();
 515         return $wgReadOnly;
 516 }
 517
 518 /**
 519  * Return a Language object from $langcode
 520  * @param $langcode Mixed: either:
 521  *                  - a Language object
 522  *                  - code of the language to get the message for, if it is
 523  *                    a valid code create a language for that language, if
 524  *                    it is a string but not a valid code then make a basic
 525  *                    language object
 526  *                  - a boolean: if it's false then use the current users
 527  *                    language (as a fallback for the old parameter
 528  *                    functionality), or if it is true then use the wikis
 529  * @return Language object
 530  */
 531 function wfGetLangObj( $langcode = false ){
 532         # Identify which language to get or create a language object for.
 533         if( $langcode instanceof Language )
 534                 # Great, we already have the object!
 535                 return $langcode;
 536
 537         global $wgContLang;
 538         if( $langcode === $wgContLang->getCode() || $langcode === true )
 539                 # $langcode is the language code of the wikis content language object.
 540                 # or it is a boolean and value is true
 541                 return $wgContLang;
 542
 543         global $wgLang;
 544         if( $langcode === $wgLang->getCode() || $langcode === false )
 545                 # $langcode is the language code of user language object.
 546                 # or it was a boolean and value is false
 547                 return $wgLang;
 548
 549         $validCodes = array_keys( Language::getLanguageNames() );
 550         if( in_array( $langcode, $validCodes ) )
 551                 # $langcode corresponds to a valid language.
 552                 return Language::factory( $langcode );
 553
 554         # $langcode is a string, but not a valid language code; use content language.
 555         wfDebug( "Invalid language code passed to wfGetLangObj, falling back to content language.\n" );
 556         return $wgContLang;
 557 }
 558
 559 /**
 560  * Get a message from anywhere, for the current user language.
 561  *
 562  * Use wfMsgForContent() instead if the message should NOT
 563  * change depending on the user preferences.
 564  *
 565  * @param $key String: lookup key for the message, usually
 566  *    defined in languages/Language.php
 567  *
 568  * This function also takes extra optional parameters (not
 569  * shown in the function definition), which can by used to
 570  * insert variable text into the predefined message.
 571  */
 572 function wfMsg( $key ) {
 573         $args = func_get_args();
 574         array_shift( $args );
 575         return wfMsgReal( $key, $args, true );
 576 }
 577
 578 /**
 579  * Same as above except doesn't transform the message
 580  */
 581 function wfMsgNoTrans( $key ) {
 582         $args = func_get_args();
 583         array_shift( $args );
 584         return wfMsgReal( $key, $args, true, false, false );
 585 }
 586
 587 /**
 588  * Get a message from anywhere, for the current global language
 589  * set with $wgLanguageCode.
 590  *
 591  * Use this if the message should NOT change  dependent on the
 592  * language set in the user's preferences. This is the case for
 593  * most text written into logs, as well as link targets (such as
 594  * the name of the copyright policy page). Link titles, on the
 595  * other hand, should be shown in the UI language.
 596  *
 597  * Note that MediaWiki allows users to change the user interface
 598  * language in their preferences, but a single installation
 599  * typically only contains content in one language.
 600  *
 601  * Be wary of this distinction: If you use wfMsg() where you should
 602  * use wfMsgForContent(), a user of the software may have to
 603  * customize potentially hundreds of messages in
 604  * order to, e.g., fix a link in every possible language.
 605  *
 606  * @param $key String: lookup key for the message, usually
 607  *    defined in languages/Language.php
 608  */
 609 function wfMsgForContent( $key ) {
 610         global $wgForceUIMsgAsContentMsg;
 611         $args = func_get_args();
 612         array_shift( $args );
 613         $forcontent = true;
 614         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 615                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 616                 $forcontent = false;
 617         return wfMsgReal( $key, $args, true, $forcontent );
 618 }
 619
 620 /**
 621  * Same as above except doesn't transform the message
 622  */
 623 function wfMsgForContentNoTrans( $key ) {
 624         global $wgForceUIMsgAsContentMsg;
 625         $args = func_get_args();
 626         array_shift( $args );
 627         $forcontent = true;
 628         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 629                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 630                 $forcontent = false;
 631         return wfMsgReal( $key, $args, true, $forcontent, false );
 632 }
 633
 634 /**
 635  * Get a message from the language file, for the UI elements
 636  */
 637 function wfMsgNoDB( $key ) {
 638         $args = func_get_args();
 639         array_shift( $args );
 640         return wfMsgReal( $key, $args, false );
 641 }
 642
 643 /**
 644  * Get a message from the language file, for the content
 645  */
 646 function wfMsgNoDBForContent( $key ) {
 647         global $wgForceUIMsgAsContentMsg;
 648         $args = func_get_args();
 649         array_shift( $args );
 650         $forcontent = true;
 651         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 652                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 653                 $forcontent = false;
 654         return wfMsgReal( $key, $args, false, $forcontent );
 655 }
 656
 657
 658 /**
 659  * Really get a message
 660  * @param $key String: key to get.
 661  * @param $args
 662  * @param $useDB Boolean
 663  * @param $forContent Mixed: Language code, or false for user lang, true for content lang.
 664  * @param $transform Boolean: Whether or not to transform the message.
 665  * @return String: the requested message.
 666  */
 667 function wfMsgReal( $key, $args, $useDB = true, $forContent = false, $transform = true ) {
 668         wfProfileIn( __METHOD__ );
 669         $message = wfMsgGetKey( $key, $useDB, $forContent, $transform );
 670         $message = wfMsgReplaceArgs( $message, $args );
 671         wfProfileOut( __METHOD__ );
 672         return $message;
 673 }
 674
 675 /**
 676  * This function provides the message source for messages to be edited which are *not* stored in the database.
 677  * @param $key String:
 678  */
 679 function wfMsgWeirdKey( $key ) {
 680         $source = wfMsgGetKey( $key, false, true, false );
 681         if ( wfEmptyMsg( $key, $source ) )
 682                 return "";
 683         else
 684                 return $source;
 685 }
 686
 687 /**
 688  * Fetch a message string value, but don't replace any keys yet.
 689  * @param $key String
 690  * @param $useDB Bool
 691  * @param $langCode String: Code of the language to get the message for, or
 692  *                  behaves as a content language switch if it is a boolean.
 693  * @param $transform Boolean: whether to parse magic words, etc.
 694  * @return string
 695  * @private
 696  */
 697 function wfMsgGetKey( $key, $useDB, $langCode = false, $transform = true ) {
 698         global $wgContLang, $wgMessageCache;
 699
 700         wfRunHooks('NormalizeMessageKey', array(&$key, &$useDB, &$langCode, &$transform));
 701
 702         # If $wgMessageCache isn't initialised yet, try to return something sensible.
 703         if( is_object( $wgMessageCache ) ) {
 704                 $message = $wgMessageCache->get( $key, $useDB, $langCode );
 705                 if( $message === false ){
 706                         $message = '&lt;' . htmlspecialchars( $key ) . '&gt;';
 707                 } elseif ( $transform ) {
 708                         $message = $wgMessageCache->transform( $message );
 709                 }
 710         } else {
 711                 $lang = wfGetLangObj( $langCode );
 712
 713                 # MessageCache::get() does this already, Language::getMessage() doesn't
 714                 # ISSUE: Should we try to handle "message/lang" here too?
 715                 $key = str_replace( ' ' , '_' , $wgContLang->lcfirst( $key ) );
 716
 717                 if( is_object( $lang ) ) {
 718                         $message = $lang->getMessage( $key );
 719                 } else {
 720                         $message = false;
 721                 }
 722         }
 723
 724         return $message;
 725 }
 726
 727 /**
 728  * Replace message parameter keys on the given formatted output.
 729  *
 730  * @param $message String
 731  * @param $args Array
 732  * @return string
 733  * @private
 734  */
 735 function wfMsgReplaceArgs( $message, $args ) {
 736         # Fix windows line-endings
 737         # Some messages are split with explode("\n", $msg)
 738         $message = str_replace( "\r", '', $message );
 739
 740         // Replace arguments
 741         if ( count( $args ) ) {
 742                 if ( is_array( $args[0] ) ) {
 743                         $args = array_values( $args[0] );
 744                 }
 745                 $replacementKeys = array();
 746                 foreach( $args as $n => $param ) {
 747                         $replacementKeys['$' . ($n + 1)] = $param;
 748                 }
 749                 $message = strtr( $message, $replacementKeys );
 750         }
 751
 752         return $message;
 753 }
 754
 755 /**
 756  * Return an HTML-escaped version of a message.
 757  * Parameter replacements, if any, are done *after* the HTML-escaping,
 758  * so parameters may contain HTML (eg links or form controls). Be sure
 759  * to pre-escape them if you really do want plaintext, or just wrap
 760  * the whole thing in htmlspecialchars().
 761  *
 762  * @param $key String
 763  * @param string ... parameters
 764  * @return string
 765  */
 766 function wfMsgHtml( $key ) {
 767         $args = func_get_args();
 768         array_shift( $args );
 769         return wfMsgReplaceArgs( htmlspecialchars( wfMsgGetKey( $key, true ) ), $args );
 770 }
 771
 772 /**
 773  * Return an HTML version of message
 774  * Parameter replacements, if any, are done *after* parsing the wiki-text message,
 775  * so parameters may contain HTML (eg links or form controls). Be sure
 776  * to pre-escape them if you really do want plaintext, or just wrap
 777  * the whole thing in htmlspecialchars().
 778  *
 779  * @param $key String
 780  * @param string ... parameters
 781  * @return string
 782  */
 783 function wfMsgWikiHtml( $key ) {
 784         global $wgOut;
 785         $args = func_get_args();
 786         array_shift( $args );
 787         return wfMsgReplaceArgs( $wgOut->parse( wfMsgGetKey( $key, true ), /* can't be set to false */ true ), $args );
 788 }
 789
 790 /**
 791  * Returns message in the requested format
 792  * @param $key String: key of the message
 793  * @param $options Array: processing rules. Can take the following options:
 794  *   <i>parse</i>: parses wikitext to html
 795  *   <i>parseinline</i>: parses wikitext to html and removes the surrounding
 796  *       p's added by parser or tidy
 797  *   <i>escape</i>: filters message through htmlspecialchars
 798  *   <i>escapenoentities</i>: same, but allows entity references like &#160; through
 799  *   <i>replaceafter</i>: parameters are substituted after parsing or escaping
 800  *   <i>parsemag</i>: transform the message using magic phrases
 801  *   <i>content</i>: fetch message for content language instead of interface
 802  * Also can accept a single associative argument, of the form 'language' => 'xx':
 803  *   <i>language</i>: Language object or language code to fetch message for
 804  *       (overriden by <i>content</i>), its behaviour with parser, parseinline
 805  *       and parsemag is undefined.
 806  * Behavior for conflicting options (e.g., parse+parseinline) is undefined.
 807  */
 808 function wfMsgExt( $key, $options ) {
 809         global $wgOut;
 810
 811         $args = func_get_args();
 812         array_shift( $args );
 813         array_shift( $args );
 814         $options = (array)$options;
 815
 816         foreach( $options as $arrayKey => $option ) {
 817                 if( !preg_match( '/^[0-9]+|language$/', $arrayKey ) ) {
 818                         # An unknown index, neither numeric nor "language"
 819                         wfWarn( "wfMsgExt called with incorrect parameter key $arrayKey", 1, E_USER_WARNING );
 820                 } elseif( preg_match( '/^[0-9]+$/', $arrayKey ) && !in_array( $option,
 821                 array( 'parse', 'parseinline', 'escape', 'escapenoentities',
 822                 'replaceafter', 'parsemag', 'content' ) ) ) {
 823                         # A numeric index with unknown value
 824                         wfWarn( "wfMsgExt called with incorrect parameter $option", 1, E_USER_WARNING );
 825                 }
 826         }
 827
 828         if( in_array('content', $options, true ) ) {
 829                 $forContent = true;
 830                 $langCode = true;
 831         } elseif( array_key_exists('language', $options) ) {
 832                 $forContent = false;
 833                 $langCode = wfGetLangObj( $options['language'] );
 834         } else {
 835                 $forContent = false;
 836                 $langCode = false;
 837         }
 838
 839         $string = wfMsgGetKey( $key, /*DB*/true, $langCode, /*Transform*/false );
 840
 841         if( !in_array('replaceafter', $options, true ) ) {
 842                 $string = wfMsgReplaceArgs( $string, $args );
 843         }
 844
 845         if( in_array('parse', $options, true ) ) {
 846                 $string = $wgOut->parse( $string, true, !$forContent );
 847         } elseif ( in_array('parseinline', $options, true ) ) {
 848                 $string = $wgOut->parse( $string, true, !$forContent );
 849                 $m = array();
 850                 if( preg_match( '/^<p>(.*)\n?<\/p>\n?$/sU', $string, $m ) ) {
 851                         $string = $m[1];
 852                 }
 853         } elseif ( in_array('parsemag', $options, true ) ) {
 854                 global $wgMessageCache;
 855                 if ( isset( $wgMessageCache ) ) {
 856                         $string = $wgMessageCache->transform( $string,
 857                                 !$forContent,
 858                                 is_object( $langCode ) ? $langCode : null );
 859                 }
 860         }
 861
 862         if ( in_array('escape', $options, true ) ) {
 863                 $string = htmlspecialchars ( $string );
 864         } elseif ( in_array( 'escapenoentities', $options, true  ) ) {
 865                 $string = Sanitizer::escapeHtmlAllowEntities( $string );
 866         }
 867
 868         if( in_array('replaceafter', $options, true ) ) {
 869                 $string = wfMsgReplaceArgs( $string, $args );
 870         }
 871
 872         return $string;
 873 }
 874
 875
 876 /**
 877  * Just like exit() but makes a note of it.
 878  * Commits open transactions except if the error parameter is set
 879  *
 880  * @deprecated Please return control to the caller or throw an exception
 881  */
 882 function wfAbruptExit( $error = false ){
 883         static $called = false;
 884         if ( $called ){
 885                 exit( -1 );
 886         }
 887         $called = true;
 888
 889         $bt = wfDebugBacktrace();
 890         if( $bt ) {
 891                 for($i = 0; $i < count($bt) ; $i++){
 892                         $file = isset($bt[$i]['file']) ? $bt[$i]['file'] : "unknown";
 893                         $line = isset($bt[$i]['line']) ? $bt[$i]['line'] : "unknown";
 894                         wfDebug("WARNING: Abrupt exit in $file at line $line\n");
 895                 }
 896         } else {
 897                 wfDebug("WARNING: Abrupt exit\n");
 898         }
 899
 900         wfLogProfilingData();
 901
 902         if ( !$error ) {
 903                 wfGetLB()->closeAll();
 904         }
 905         exit( -1 );
 906 }
 907
 908 /**
 909  * @deprecated Please return control the caller or throw an exception
 910  */
 911 function wfErrorExit() {
 912         wfAbruptExit( true );
 913 }
 914
 915 /**
 916  * Print a simple message and die, returning nonzero to the shell if any.
 917  * Plain die() fails to return nonzero to the shell if you pass a string.
 918  * @param $msg String
 919  */
 920 function wfDie( $msg='' ) {
 921         echo $msg;
 922         die( 1 );
 923 }
 924
 925 /**
 926  * Throw a debugging exception. This function previously once exited the process,
 927  * but now throws an exception instead, with similar results.
 928  *
 929  * @param $msg String: message shown when dieing.
 930  */
 931 function wfDebugDieBacktrace( $msg = '' ) {
 932         throw new MWException( $msg );
 933 }
 934
 935 /**
 936  * Fetch server name for use in error reporting etc.
 937  * Use real server name if available, so we know which machine
 938  * in a server farm generated the current page.
 939  * @return string
 940  */
 941 function wfHostname() {
 942         static $host;
 943         if ( is_null( $host ) ) {
 944                 if ( function_exists( 'posix_uname' ) ) {
 945                         // This function not present on Windows
 946                         $uname = @posix_uname();
 947                 } else {
 948                         $uname = false;
 949                 }
 950                 if( is_array( $uname ) && isset( $uname['nodename'] ) ) {
 951                         $host = $uname['nodename'];
 952                 } elseif ( getenv( 'COMPUTERNAME' ) ) {
 953                         # Windows computer name
 954                         $host = getenv( 'COMPUTERNAME' );
 955                 } else {
 956                         # This may be a virtual server.
 957                         $host = $_SERVER['SERVER_NAME'];
 958                 }
 959         }
 960         return $host;
 961 }
 962
 963 /**
 964  * Returns a HTML comment with the elapsed time since request.
 965  * This method has no side effects.
 966  * @return string
 967  */
 968 function wfReportTime() {
 969         global $wgRequestTime, $wgShowHostnames;
 970
 971         $now = wfTime();
 972         $elapsed = $now - $wgRequestTime;
 973
 974         return $wgShowHostnames
 975                 ? sprintf( "<!-- Served by %s in %01.3f secs. -->", wfHostname(), $elapsed )
 976                 : sprintf( "<!-- Served in %01.3f secs. -->", $elapsed );
 977 }
 978
 979 /**
 980  * Safety wrapper for debug_backtrace().
 981  *
 982  * With Zend Optimizer 3.2.0 loaded, this causes segfaults under somewhat
 983  * murky circumstances, which may be triggered in part by stub objects
 984  * or other fancy talkin'.
 985  *
 986  * Will return an empty array if Zend Optimizer is detected or if
 987  * debug_backtrace is disabled, otherwise the output from
 988  * debug_backtrace() (trimmed).
 989  *
 990  * @return array of backtrace information
 991  */
 992 function wfDebugBacktrace() {
 993         static $disabled = null;
 994
 995         if( extension_loaded( 'Zend Optimizer' ) ) {
 996                 wfDebug( "Zend Optimizer detected; skipping debug_backtrace for safety.\n" );
 997                 return array();
 998         }
 999
1000         if ( is_null( $disabled ) ) {
1001                 $disabled = false;
1002                 $functions = explode( ',', ini_get( 'disable_functions' ) );
1003                 $functions = array_map( 'trim', $functions );
1004                 $functions = array_map( 'strtolower', $functions );
1005                 if ( in_array( 'debug_backtrace', $functions ) ) {
1006                         wfDebug( "debug_backtrace is in disabled_functions\n" );
1007                         $disabled = true;
1008                 }
1009         }
1010         if ( $disabled ) {
1011                 return array();
1012         }
1013
1014         return array_slice( debug_backtrace(), 1 );
1015 }
1016
1017 function wfBacktrace() {
1018         global $wgCommandLineMode;
1019
1020         if ( $wgCommandLineMode ) {
1021                 $msg = '';
1022         } else {
1023                 $msg = "<ul>\n";
1024         }
1025         $backtrace = wfDebugBacktrace();
1026         foreach( $backtrace as $call ) {
1027                 if( isset( $call['file'] ) ) {
1028                         $f = explode( DIRECTORY_SEPARATOR, $call['file'] );
1029                         $file = $f[count($f)-1];
1030                 } else {
1031                         $file = '-';
1032                 }
1033                 if( isset( $call['line'] ) ) {
1034                         $line = $call['line'];
1035                 } else {
1036                         $line = '-';
1037                 }
1038                 if ( $wgCommandLineMode ) {
1039                         $msg .= "$file line $line calls ";
1040                 } else {
1041                         $msg .= '<li>' . $file . ' line ' . $line . ' calls ';
1042                 }
1043                 if( !empty( $call['class'] ) ) $msg .= $call['class'] . '::';
1044                 $msg .= $call['function'] . '()';
1045
1046                 if ( $wgCommandLineMode ) {
1047                         $msg .= "\n";
1048                 } else {
1049                         $msg .= "</li>\n";
1050                 }
1051         }
1052         if ( $wgCommandLineMode ) {
1053                 $msg .= "\n";
1054         } else {
1055                 $msg .= "</ul>\n";
1056         }
1057
1058         return $msg;
1059 }
1060
1061
1062 /* Some generic result counters, pulled out of SearchEngine */
1063
1064
1065 /**
1066  * @todo document
1067  */
1068 function wfShowingResults( $offset, $limit ) {
1069         global $wgLang;
1070         return wfMsgExt( 'showingresults', array( 'parseinline' ), $wgLang->formatNum( $limit ),
1071                 $wgLang->formatNum( $offset+1 ) );
1072 }
1073
1074 /**
1075  * @todo document
1076  */
1077 function wfShowingResultsNum( $offset, $limit, $num ) {
1078         global $wgLang;
1079         return wfMsgExt( 'showingresultsnum', array( 'parseinline' ), $wgLang->formatNum( $limit ),
1080                 $wgLang->formatNum( $offset+1 ), $wgLang->formatNum( $num ) );
1081 }
1082
1083 /**
1084  * Generate (prev x| next x) (20|50|100...) type links for paging
1085  * @param $offset String
1086  * @param $limit Integer
1087  * @param $link String
1088  * @param $query String: optional URL query parameter string
1089  * @param $atend Bool: optional param for specified if this is the last page
1090  */
1091 function wfViewPrevNext( $offset, $limit, $link, $query = '', $atend = false ) {
1092         global $wgLang;
1093         $fmtLimit = $wgLang->formatNum( $limit );
1094         // FIXME: Why on earth this needs one message for the text and another one for tooltip??
1095         # Get prev/next link display text
1096         $prev =  wfMsgExt( 'prevn', array('parsemag','escape'), $fmtLimit );
1097         $next =  wfMsgExt( 'nextn', array('parsemag','escape'), $fmtLimit );
1098         # Get prev/next link title text
1099         $pTitle = wfMsgExt( 'prevn-title', array('parsemag','escape'), $fmtLimit );
1100         $nTitle = wfMsgExt( 'nextn-title', array('parsemag','escape'), $fmtLimit );
1101         # Fetch the title object
1102         if( is_object( $link ) ) {
1103                 $title =& $link;
1104         } else {
1105                 $title = Title::newFromText( $link );
1106                 if( is_null( $title ) ) {
1107                         return false;
1108                 }
1109         }
1110         # Make 'previous' link
1111         if( 0 != $offset ) {
1112                 $po = $offset - $limit;
1113                 $po = max($po,0);
1114                 $q = "limit={$limit}&offset={$po}";
1115                 if( $query != '' ) {
1116                         $q .= '&'.$query;
1117                 }
1118                 $plink = '<a href="' . $title->escapeLocalUrl( $q ) . "\" title=\"{$pTitle}\" class=\"mw-prevlink\">{$prev}</a>";
1119         } else {
1120                 $plink = $prev;
1121         }
1122         # Make 'next' link
1123         $no = $offset + $limit;
1124         $q = "limit={$limit}&offset={$no}";
1125         if( $query != '' ) {
1126                 $q .= '&'.$query;
1127         }
1128         if( $atend ) {
1129                 $nlink = $next;
1130         } else {
1131                 $nlink = '<a href="' . $title->escapeLocalUrl( $q ) . "\" title=\"{$nTitle}\" class=\"mw-nextlink\">{$next}</a>";
1132         }
1133         # Make links to set number of items per page
1134         $nums = $wgLang->pipeList( array(
1135                 wfNumLink( $offset, 20, $title, $query ),
1136                 wfNumLink( $offset, 50, $title, $query ),
1137                 wfNumLink( $offset, 100, $title, $query ),
1138                 wfNumLink( $offset, 250, $title, $query ),
1139                 wfNumLink( $offset, 500, $title, $query )
1140         ) );
1141         return wfMsgHtml( 'viewprevnext', $plink, $nlink, $nums );
1142 }
1143
1144 /**
1145  * Generate links for (20|50|100...) items-per-page links
1146  * @param $offset String
1147  * @param $limit Integer
1148  * @param $title Title
1149  * @param $query String: optional URL query parameter string
1150  */
1151 function wfNumLink( $offset, $limit, $title, $query = '' ) {
1152         global $wgLang;
1153         if( $query == '' ) {
1154                 $q = '';
1155         } else {
1156                 $q = $query.'&';
1157         }
1158         $q .= "limit={$limit}&offset={$offset}";
1159         $fmtLimit = $wgLang->formatNum( $limit );
1160         $lTitle = wfMsgExt('shown-title',array('parsemag','escape'),$limit);
1161         $s = '<a href="' . $title->escapeLocalUrl( $q ) . "\" title=\"{$lTitle}\" class=\"mw-numlink\">{$fmtLimit}</a>";
1162         return $s;
1163 }
1164
1165 /**
1166  * @todo document
1167  * @todo FIXME: we may want to blacklist some broken browsers
1168  *
1169  * @return bool Whereas client accept gzip compression
1170  */
1171 function wfClientAcceptsGzip() {
1172         if( isset( $_SERVER['HTTP_ACCEPT_ENCODING'] ) ) {
1173                 # FIXME: we may want to blacklist some broken browsers
1174                 $m = array();
1175                 if( preg_match(
1176                         '/\bgzip(?:;(q)=([0-9]+(?:\.[0-9]+)))?\b/',
1177                         $_SERVER['HTTP_ACCEPT_ENCODING'],
1178                         $m ) ) {
1179                         if( isset( $m[2] ) && ( $m[1] == 'q' ) && ( $m[2] == 0 ) ) return false;
1180                         wfDebug( " accepts gzip\n" );
1181                         return true;
1182                 }
1183         }
1184         return false;
1185 }
1186
1187 /**
1188  * Obtain the offset and limit values from the request string;
1189  * used in special pages
1190  *
1191  * @param $deflimit Default limit if none supplied
1192  * @param $optionname Name of a user preference to check against
1193  * @return array
1194  *
1195  */
1196 function wfCheckLimits( $deflimit = 50, $optionname = 'rclimit' ) {
1197         global $wgRequest;
1198         return $wgRequest->getLimitOffset( $deflimit, $optionname );
1199 }
1200
1201 /**
1202  * Escapes the given text so that it may be output using addWikiText()
1203  * without any linking, formatting, etc. making its way through. This
1204  * is achieved by substituting certain characters with HTML entities.
1205  * As required by the callers, <nowiki> is not used. It currently does
1206  * not filter out characters which have special meaning only at the
1207  * start of a line, such as "*".
1208  *
1209  * @param $text String: text to be escaped
1210  */
1211 function wfEscapeWikiText( $text ) {
1212         $text = str_replace(
1213                 array( '[',     '|',      ']',     '\'',    'ISBN ',     'RFC ',     '://',     "\n=",     '{{' ), # }}
1214                 array( '&#91;', '&#124;', '&#93;', '&#39;', 'ISBN&#32;', 'RFC&#32;', '&#58;//', "\n&#61;", '&#123;&#123;' ),
1215                 htmlspecialchars($text) );
1216         return $text;
1217 }
1218
1219 /**
1220  * @todo document
1221  */
1222 function wfQuotedPrintable( $string, $charset = '' ) {
1223         # Probably incomplete; see RFC 2045
1224         if( empty( $charset ) ) {
1225                 global $wgInputEncoding;
1226                 $charset = $wgInputEncoding;
1227         }
1228         $charset = strtoupper( $charset );
1229         $charset = str_replace( 'ISO-8859', 'ISO8859', $charset ); // ?
1230
1231         $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
1232         $replace = $illegal . '\t ?_';
1233         if( !preg_match( "/[$illegal]/", $string ) ) return $string;
1234         $out = "=?$charset?Q?";
1235         $out .= preg_replace( "/([$replace])/e", 'sprintf("=%02X",ord("$1"))', $string );
1236         $out .= '?=';
1237         return $out;
1238 }
1239
1240
1241 /**
1242  * @todo document
1243  * @return float
1244  */
1245 function wfTime() {
1246         return microtime(true);
1247 }
1248
1249 /**
1250  * Sets dest to source and returns the original value of dest
1251  * If source is NULL, it just returns the value, it doesn't set the variable
1252  */
1253 function wfSetVar( &$dest, $source ) {
1254         $temp = $dest;
1255         if ( !is_null( $source ) ) {
1256                 $dest = $source;
1257         }
1258         return $temp;
1259 }
1260
1261 /**
1262  * As for wfSetVar except setting a bit
1263  */
1264 function wfSetBit( &$dest, $bit, $state = true ) {
1265         $temp = (bool)($dest & $bit );
1266         if ( !is_null( $state ) ) {
1267                 if ( $state ) {
1268                         $dest |= $bit;
1269                 } else {
1270                         $dest &= ~$bit;
1271                 }
1272         }
1273         return $temp;
1274 }
1275
1276 /**
1277  * This function takes two arrays as input, and returns a CGI-style string, e.g.
1278  * "days=7&limit=100". Options in the first array override options in the second.
1279  * Options set to "" will not be output.
1280  */
1281 function wfArrayToCGI( $array1, $array2 = null )
1282 {
1283         if ( !is_null( $array2 ) ) {
1284                 $array1 = $array1 + $array2;
1285         }
1286
1287         $cgi = '';
1288         foreach ( $array1 as $key => $value ) {
1289                 if ( $value !== '' ) {
1290                         if ( $cgi != '' ) {
1291                                 $cgi .= '&';
1292                         }
1293                         if ( is_array( $value ) ) {
1294                                 $firstTime = true;
1295                                 foreach ( $value as $v ) {
1296                                         $cgi .= ( $firstTime ? '' : '&') .
1297                                                 urlencode( $key . '[]' ) . '=' .
1298                                                 urlencode( $v );
1299                                         $firstTime = false;
1300                                 }
1301                         } else {
1302                                 if ( is_object( $value ) ) {
1303                                         $value = $value->__toString();
1304                                 }
1305                                 $cgi .= urlencode( $key ) . '=' .
1306                                         urlencode( $value );
1307                         }
1308                 }
1309         }
1310         return $cgi;
1311 }
1312
1313 /**
1314  * This is the logical opposite of wfArrayToCGI(): it accepts a query string as
1315  * its argument and returns the same string in array form.  This allows compa-
1316  * tibility with legacy functions that accept raw query strings instead of nice
1317  * arrays.  Of course, keys and values are urldecode()d.  Don't try passing in-
1318  * valid query strings, or it will explode.
1319  *
1320  * @param $query String: query string
1321  * @return array Array version of input
1322  */
1323 function wfCgiToArray( $query ) {
1324         if( isset( $query[0] ) and $query[0] == '?' ) {
1325                 $query = substr( $query, 1 );
1326         }
1327         $bits = explode( '&', $query );
1328         $ret = array();
1329         foreach( $bits as $bit ) {
1330                 if( $bit === '' ) {
1331                         continue;
1332                 }
1333                 list( $key, $value ) = explode( '=', $bit );
1334                 $key = urldecode( $key );
1335                 $value = urldecode( $value );
1336                 $ret[$key] = $value;
1337         }
1338         return $ret;
1339 }
1340
1341 /**
1342  * Append a query string to an existing URL, which may or may not already
1343  * have query string parameters already. If so, they will be combined.
1344  *
1345  * @param $url String
1346  * @param $query Mixed: string or associative array
1347  * @return string
1348  */
1349 function wfAppendQuery( $url, $query ) {
1350         if ( is_array( $query ) ) {
1351                 $query = wfArrayToCGI( $query );
1352         }
1353         if( $query != '' ) {
1354                 if( false === strpos( $url, '?' ) ) {
1355                         $url .= '?';
1356                 } else {
1357                         $url .= '&';
1358                 }
1359                 $url .= $query;
1360         }
1361         return $url;
1362 }
1363
1364 /**
1365  * Expand a potentially local URL to a fully-qualified URL.  Assumes $wgServer
1366  * and $wgProto are correct.
1367  *
1368  * @todo this won't work with current-path-relative URLs
1369  * like "subdir/foo.html", etc.
1370  *
1371  * @param $url String: either fully-qualified or a local path + query
1372  * @return string Fully-qualified URL
1373  */
1374 function wfExpandUrl( $url ) {
1375         if( substr( $url, 0, 2 ) == '//' ) {
1376                 global $wgProto;
1377                 return $wgProto . ':' . $url;
1378         } elseif( substr( $url, 0, 1 ) == '/' ) {
1379                 global $wgServer;
1380                 return $wgServer . $url;
1381         } else {
1382                 return $url;
1383         }
1384 }
1385
1386 /**
1387  * This is obsolete, use SquidUpdate::purge()
1388  * @deprecated
1389  */
1390 function wfPurgeSquidServers ($urlArr) {
1391         SquidUpdate::purge( $urlArr );
1392 }
1393
1394 /**
1395  * Windows-compatible version of escapeshellarg()
1396  * Windows doesn't recognise single-quotes in the shell, but the escapeshellarg()
1397  * function puts single quotes in regardless of OS.
1398  *
1399  * Also fixes the locale problems on Linux in PHP 5.2.6+ (bug backported to
1400  * earlier distro releases of PHP)
1401  */
1402 function wfEscapeShellArg( ) {
1403         wfInitShellLocale();
1404
1405         $args = func_get_args();
1406         $first = true;
1407         $retVal = '';
1408         foreach ( $args as $arg ) {
1409                 if ( !$first ) {
1410                         $retVal .= ' ';
1411                 } else {
1412                         $first = false;
1413                 }
1414
1415                 if ( wfIsWindows() ) {
1416                         // Escaping for an MSVC-style command line parser
1417                         // Ref: http://mailman.lyra.org/pipermail/scite-interest/2002-March/000436.html
1418                         // Double the backslashes before any double quotes. Escape the double quotes.
1419                         $tokens = preg_split( '/(\\\\*")/', $arg, -1, PREG_SPLIT_DELIM_CAPTURE );
1420                         $arg = '';
1421                         $delim = false;
1422                         foreach ( $tokens as $token ) {
1423                                 if ( $delim ) {
1424                                         $arg .= str_replace( '\\', '\\\\', substr( $token, 0, -1 ) ) . '\\"';
1425                                 } else {
1426                                         $arg .= $token;
1427                                 }
1428                                 $delim = !$delim;
1429                         }
1430
1431                         // Double the backslashes before the end of the string, because
1432                         // we will soon add a quote
1433                         $m = array();
1434                         if ( preg_match( '/^(.*?)(\\\\+)$/', $arg, $m ) ) {
1435                                 $arg = $m[1] . str_replace( '\\', '\\\\', $m[2] );
1436                         }
1437
1438                         // The caret is also an special character
1439                         $arg = str_replace( "^", "^^", $arg );
1440
1441                         // Add surrounding quotes
1442                         $retVal .= '"' . $arg . '"';
1443                 } else {
1444                         $retVal .= escapeshellarg( $arg );
1445                 }
1446         }
1447         return $retVal;
1448 }
1449
1450 /**
1451  * wfMerge attempts to merge differences between three texts.
1452  * Returns true for a clean merge and false for failure or a conflict.
1453  */
1454 function wfMerge( $old, $mine, $yours, &$result ){
1455         global $wgDiff3;
1456
1457         # This check may also protect against code injection in
1458         # case of broken installations.
1459         if( !$wgDiff3 || !file_exists( $wgDiff3 ) ) {
1460                 wfDebug( "diff3 not found\n" );
1461                 return false;
1462         }
1463
1464         # Make temporary files
1465         $td = wfTempDir();
1466         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
1467         $mytextFile = fopen( $mytextName = tempnam( $td, 'merge-mine-' ), 'w' );
1468         $yourtextFile = fopen( $yourtextName = tempnam( $td, 'merge-your-' ), 'w' );
1469
1470         fwrite( $oldtextFile, $old ); fclose( $oldtextFile );
1471         fwrite( $mytextFile, $mine ); fclose( $mytextFile );
1472         fwrite( $yourtextFile, $yours ); fclose( $yourtextFile );
1473
1474         # Check for a conflict
1475         $cmd = $wgDiff3 . ' -a --overlap-only ' .
1476           wfEscapeShellArg( $mytextName ) . ' ' .
1477           wfEscapeShellArg( $oldtextName ) . ' ' .
1478           wfEscapeShellArg( $yourtextName );
1479         $handle = popen( $cmd, 'r' );
1480
1481         if( fgets( $handle, 1024 ) ){
1482                 $conflict = true;
1483         } else {
1484                 $conflict = false;
1485         }
1486         pclose( $handle );
1487
1488         # Merge differences
1489         $cmd = $wgDiff3 . ' -a -e --merge ' .
1490           wfEscapeShellArg( $mytextName, $oldtextName, $yourtextName );
1491         $handle = popen( $cmd, 'r' );
1492         $result = '';
1493         do {
1494                 $data = fread( $handle, 8192 );
1495                 if ( strlen( $data ) == 0 ) {
1496                         break;
1497                 }
1498                 $result .= $data;
1499         } while ( true );
1500         pclose( $handle );
1501         unlink( $mytextName ); unlink( $oldtextName ); unlink( $yourtextName );
1502
1503         if ( $result === '' && $old !== '' && $conflict == false ) {
1504                 wfDebug( "Unexpected null result from diff3. Command: $cmd\n" );
1505                 $conflict = true;
1506         }
1507         return ! $conflict;
1508 }
1509
1510 /**
1511  * Returns unified plain-text diff of two texts.
1512  * Useful for machine processing of diffs.
1513  * @param $before String: the text before the changes.
1514  * @param $after String: the text after the changes.
1515  * @param $params String: command-line options for the diff command.
1516  * @return String: unified diff of $before and $after
1517  */
1518 function wfDiff( $before, $after, $params = '-u' ) {
1519         if ($before == $after) {
1520                 return '';
1521         }
1522
1523         global $wgDiff;
1524
1525         # This check may also protect against code injection in
1526         # case of broken installations.
1527         if( !file_exists( $wgDiff ) ){
1528                 wfDebug( "diff executable not found\n" );
1529                 $diffs = new Diff( explode( "\n", $before ), explode( "\n", $after ) );
1530                 $format = new UnifiedDiffFormatter();
1531                 return $format->format( $diffs );
1532         }
1533
1534         # Make temporary files
1535         $td = wfTempDir();
1536         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
1537         $newtextFile = fopen( $newtextName = tempnam( $td, 'merge-your-' ), 'w' );
1538
1539         fwrite( $oldtextFile, $before ); fclose( $oldtextFile );
1540         fwrite( $newtextFile, $after ); fclose( $newtextFile );
1541
1542         // Get the diff of the two files
1543         $cmd = "$wgDiff " . $params . ' ' .wfEscapeShellArg( $oldtextName, $newtextName );
1544
1545         $h = popen( $cmd, 'r' );
1546
1547         $diff = '';
1548
1549         do {
1550                 $data = fread( $h, 8192 );
1551                 if ( strlen( $data ) == 0 ) {
1552                         break;
1553                 }
1554                 $diff .= $data;
1555         } while ( true );
1556
1557         // Clean up
1558         pclose( $h );
1559         unlink( $oldtextName );
1560         unlink( $newtextName );
1561
1562         // Kill the --- and +++ lines. They're not useful.
1563         $diff_lines = explode( "\n", $diff );
1564         if (strpos( $diff_lines[0], '---' ) === 0) {
1565                 unset($diff_lines[0]);
1566         }
1567         if (strpos( $diff_lines[1], '+++' ) === 0) {
1568                 unset($diff_lines[1]);
1569         }
1570
1571         $diff = implode( "\n", $diff_lines );
1572
1573         return $diff;
1574 }
1575
1576 /**
1577  * A wrapper around the PHP function var_export().
1578  * Either print it or add it to the regular output ($wgOut).
1579  *
1580  * @param $var A PHP variable to dump.
1581  */
1582 function wfVarDump( $var ) {
1583         global $wgOut;
1584         $s = str_replace("\n","<br />\n", var_export( $var, true ) . "\n");
1585         if ( headers_sent() || !@is_object( $wgOut ) ) {
1586                 print $s;
1587         } else {
1588                 $wgOut->addHTML( $s );
1589         }
1590 }
1591
1592 /**
1593  * Provide a simple HTTP error.
1594  */
1595 function wfHttpError( $code, $label, $desc ) {
1596         global $wgOut;
1597         $wgOut->disable();
1598         header( "HTTP/1.0 $code $label" );
1599         header( "Status: $code $label" );
1600         $wgOut->sendCacheControl();
1601
1602         header( 'Content-type: text/html; charset=utf-8' );
1603         print "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">".
1604                 "<html><head><title>" .
1605                 htmlspecialchars( $label ) .
1606                 "</title></head><body><h1>" .
1607                 htmlspecialchars( $label ) .
1608                 "</h1><p>" .
1609                 nl2br( htmlspecialchars( $desc ) ) .
1610                 "</p></body></html>\n";
1611 }
1612
1613 /**
1614  * Clear away any user-level output buffers, discarding contents.
1615  *
1616  * Suitable for 'starting afresh', for instance when streaming
1617  * relatively large amounts of data without buffering, or wanting to
1618  * output image files without ob_gzhandler's compression.
1619  *
1620  * The optional $resetGzipEncoding parameter controls suppression of
1621  * the Content-Encoding header sent by ob_gzhandler; by default it
1622  * is left. See comments for wfClearOutputBuffers() for why it would
1623  * be used.
1624  *
1625  * Note that some PHP configuration options may add output buffer
1626  * layers which cannot be removed; these are left in place.
1627  *
1628  * @param $resetGzipEncoding Bool
1629  */
1630 function wfResetOutputBuffers( $resetGzipEncoding=true ) {
1631         if( $resetGzipEncoding ) {
1632                 // Suppress Content-Encoding and Content-Length
1633                 // headers from 1.10+s wfOutputHandler
1634                 global $wgDisableOutputCompression;
1635                 $wgDisableOutputCompression = true;
1636         }
1637         while( $status = ob_get_status() ) {
1638                 if( $status['type'] == 0 /* PHP_OUTPUT_HANDLER_INTERNAL */ ) {
1639                         // Probably from zlib.output_compression or other
1640                         // PHP-internal setting which can't be removed.
1641                         //
1642                         // Give up, and hope the result doesn't break
1643                         // output behavior.
1644                         break;
1645                 }
1646                 if( !ob_end_clean() ) {
1647                         // Could not remove output buffer handler; abort now
1648                         // to avoid getting in some kind of infinite loop.
1649                         break;
1650                 }
1651                 if( $resetGzipEncoding ) {
1652                         if( $status['name'] == 'ob_gzhandler' ) {
1653                                 // Reset the 'Content-Encoding' field set by this handler
1654                                 // so we can start fresh.
1655                                 header( 'Content-Encoding:' );
1656                                 break;
1657                         }
1658                 }
1659         }
1660 }
1661
1662 /**
1663  * More legible than passing a 'false' parameter to wfResetOutputBuffers():
1664  *
1665  * Clear away output buffers, but keep the Content-Encoding header
1666  * produced by ob_gzhandler, if any.
1667  *
1668  * This should be used for HTTP 304 responses, where you need to
1669  * preserve the Content-Encoding header of the real result, but
1670  * also need to suppress the output of ob_gzhandler to keep to spec
1671  * and avoid breaking Firefox in rare cases where the headers and
1672  * body are broken over two packets.
1673  */
1674 function wfClearOutputBuffers() {
1675         wfResetOutputBuffers( false );
1676 }
1677
1678 /**
1679  * Converts an Accept-* header into an array mapping string values to quality
1680  * factors
1681  */
1682 function wfAcceptToPrefs( $accept, $def = '*/*' ) {
1683         # No arg means accept anything (per HTTP spec)
1684         if( !$accept ) {
1685                 return array( $def => 1.0 );
1686         }
1687
1688         $prefs = array();
1689
1690         $parts = explode( ',', $accept );
1691
1692         foreach( $parts as $part ) {
1693                 # FIXME: doesn't deal with params like 'text/html; level=1'
1694                 @list( $value, $qpart ) = explode( ';', trim( $part ) );
1695                 $match = array();
1696                 if( !isset( $qpart ) ) {
1697                         $prefs[$value] = 1.0;
1698                 } elseif( preg_match( '/q\s*=\s*(\d*\.\d+)/', $qpart, $match ) ) {
1699                         $prefs[$value] = floatval($match[1]);
1700                 }
1701         }
1702
1703         return $prefs;
1704 }
1705
1706 /**
1707  * Checks if a given MIME type matches any of the keys in the given
1708  * array. Basic wildcards are accepted in the array keys.
1709  *
1710  * Returns the matching MIME type (or wildcard) if a match, otherwise
1711  * NULL if no match.
1712  *
1713  * @param $type String
1714  * @param $avail Array
1715  * @return string
1716  * @private
1717  */
1718 function mimeTypeMatch( $type, $avail ) {
1719         if( array_key_exists($type, $avail) ) {
1720                 return $type;
1721         } else {
1722                 $parts = explode( '/', $type );
1723                 if( array_key_exists( $parts[0] . '/*', $avail ) ) {
1724                         return $parts[0] . '/*';
1725                 } elseif( array_key_exists( '*/*', $avail ) ) {
1726                         return '*/*';
1727                 } else {
1728                         return null;
1729                 }
1730         }
1731 }
1732
1733 /**
1734  * Returns the 'best' match between a client's requested internet media types
1735  * and the server's list of available types. Each list should be an associative
1736  * array of type to preference (preference is a float between 0.0 and 1.0).
1737  * Wildcards in the types are acceptable.
1738  *
1739  * @param $cprefs Array: client's acceptable type list
1740  * @param $sprefs Array: server's offered types
1741  * @return string
1742  *
1743  * @todo FIXME: doesn't handle params like 'text/plain; charset=UTF-8'
1744  * XXX: generalize to negotiate other stuff
1745  */
1746 function wfNegotiateType( $cprefs, $sprefs ) {
1747         $combine = array();
1748
1749         foreach( array_keys($sprefs) as $type ) {
1750                 $parts = explode( '/', $type );
1751                 if( $parts[1] != '*' ) {
1752                         $ckey = mimeTypeMatch( $type, $cprefs );
1753                         if( $ckey ) {
1754                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
1755                         }
1756                 }
1757         }
1758
1759         foreach( array_keys( $cprefs ) as $type ) {
1760                 $parts = explode( '/', $type );
1761                 if( $parts[1] != '*' && !array_key_exists( $type, $sprefs ) ) {
1762                         $skey = mimeTypeMatch( $type, $sprefs );
1763                         if( $skey ) {
1764                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
1765                         }
1766                 }
1767         }
1768
1769         $bestq = 0;
1770         $besttype = null;
1771
1772         foreach( array_keys( $combine ) as $type ) {
1773                 if( $combine[$type] > $bestq ) {
1774                         $besttype = $type;
1775                         $bestq = $combine[$type];
1776                 }
1777         }
1778
1779         return $besttype;
1780 }
1781
1782 /**
1783  * Array lookup
1784  * Returns an array where the values in the first array are replaced by the
1785  * values in the second array with the corresponding keys
1786  *
1787  * @return array
1788  */
1789 function wfArrayLookup( $a, $b ) {
1790         return array_flip( array_intersect( array_flip( $a ), array_keys( $b ) ) );
1791 }
1792
1793 /**
1794  * Convenience function; returns MediaWiki timestamp for the present time.
1795  * @return string
1796  */
1797 function wfTimestampNow() {
1798         # return NOW
1799         return wfTimestamp( TS_MW, time() );
1800 }
1801
1802 /**
1803  * Reference-counted warning suppression
1804  */
1805 function wfSuppressWarnings( $end = false ) {
1806         static $suppressCount = 0;
1807         static $originalLevel = false;
1808
1809         if ( $end ) {
1810                 if ( $suppressCount ) {
1811                         --$suppressCount;
1812                         if ( !$suppressCount ) {
1813                                 error_reporting( $originalLevel );
1814                         }
1815                 }
1816         } else {
1817                 if ( !$suppressCount ) {
1818                         $originalLevel = error_reporting( E_ALL & ~( E_WARNING | E_NOTICE | E_USER_WARNING | E_USER_NOTICE ) );
1819                 }
1820                 ++$suppressCount;
1821         }
1822 }
1823
1824 /**
1825  * Restore error level to previous value
1826  */
1827 function wfRestoreWarnings() {
1828         wfSuppressWarnings( true );
1829 }
1830
1831 # Autodetect, convert and provide timestamps of various types
1832
1833 /**
1834  * Unix time - the number of seconds since 1970-01-01 00:00:00 UTC
1835  */
1836 define('TS_UNIX', 0);
1837
1838 /**
1839  * MediaWiki concatenated string timestamp (YYYYMMDDHHMMSS)
1840  */
1841 define('TS_MW', 1);
1842
1843 /**
1844  * MySQL DATETIME (YYYY-MM-DD HH:MM:SS)
1845  */
1846 define('TS_DB', 2);
1847
1848 /**
1849  * RFC 2822 format, for E-mail and HTTP headers
1850  */
1851 define('TS_RFC2822', 3);
1852
1853 /**
1854  * ISO 8601 format with no timezone: 1986-02-09T20:00:00Z
1855  *
1856  * This is used by Special:Export
1857  */
1858 define('TS_ISO_8601', 4);
1859
1860 /**
1861  * An Exif timestamp (YYYY:MM:DD HH:MM:SS)
1862  *
1863  * @see http://exif.org/Exif2-2.PDF The Exif 2.2 spec, see page 28 for the
1864  *       DateTime tag and page 36 for the DateTimeOriginal and
1865  *       DateTimeDigitized tags.
1866  */
1867 define('TS_EXIF', 5);
1868
1869 /**
1870  * Oracle format time.
1871  */
1872 define('TS_ORACLE', 6);
1873
1874 /**
1875  * Postgres format time.
1876  */
1877 define('TS_POSTGRES', 7);
1878
1879 /**
1880  * DB2 format time
1881  */
1882 define('TS_DB2', 8);
1883
1884 /**
1885  * @param $outputtype Mixed: A timestamp in one of the supported formats, the
1886  *                    function will autodetect which format is supplied and act
1887  *                    accordingly.
1888  * @param $ts Mixed: the timestamp to convert or 0 for the current timestamp
1889  * @return String: in the format specified in $outputtype
1890  */
1891 function wfTimestamp( $outputtype = TS_UNIX, $ts = 0 ) {
1892         $uts = 0;
1893         $da = array();
1894         if ($ts==0) {
1895                 $uts=time();
1896         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/D',$ts,$da)) {
1897                 # TS_DB
1898         } elseif (preg_match('/^(\d{4}):(\d\d):(\d\d) (\d\d):(\d\d):(\d\d)$/D',$ts,$da)) {
1899                 # TS_EXIF
1900         } elseif (preg_match('/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/D',$ts,$da)) {
1901                 # TS_MW
1902         } elseif (preg_match('/^\d{1,13}$/D',$ts)) {
1903                 # TS_UNIX
1904                 $uts = $ts;
1905         } elseif (preg_match('/^\d{2}-\d{2}-\d{4} \d{2}:\d{2}:\d{2}.\d{6}$/', $ts)) {
1906                 # TS_ORACLE // session altered to DD-MM-YYYY HH24:MI:SS.FF6
1907                 $uts = strtotime(preg_replace('/(\d\d)\.(\d\d)\.(\d\d)(\.(\d+))?/', "$1:$2:$3",
1908                                 str_replace("+00:00", "UTC", $ts)));
1909         } elseif (preg_match('/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.*\d*)?Z$/', $ts, $da)) {
1910                 # TS_ISO_8601
1911         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.*\d*[\+\- ](\d\d)$/',$ts,$da)) {
1912                 # TS_POSTGRES
1913         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.*\d* GMT$/',$ts,$da)) {
1914                 # TS_POSTGRES
1915         } else {
1916                 # Bogus value; fall back to the epoch...
1917                 wfDebug("wfTimestamp() fed bogus time value: $outputtype; $ts\n");
1918                 $uts = 0;
1919         }
1920
1921         if (count( $da ) ) {
1922                 // Warning! gmmktime() acts oddly if the month or day is set to 0
1923                 // We may want to handle that explicitly at some point
1924                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1925                         (int)$da[2],(int)$da[3],(int)$da[1]);
1926         }
1927
1928         switch($outputtype) {
1929                 case TS_UNIX:
1930                         return $uts;
1931                 case TS_MW:
1932                         return gmdate( 'YmdHis', $uts );
1933                 case TS_DB:
1934                         return gmdate( 'Y-m-d H:i:s', $uts );
1935                 case TS_ISO_8601:
1936                         return gmdate( 'Y-m-d\TH:i:s\Z', $uts );
1937                 // This shouldn't ever be used, but is included for completeness
1938                 case TS_EXIF:
1939                         return gmdate(  'Y:m:d H:i:s', $uts );
1940                 case TS_RFC2822:
1941                         return gmdate( 'D, d M Y H:i:s', $uts ) . ' GMT';
1942                 case TS_ORACLE:
1943                         return gmdate( 'd-m-Y H:i:s.000000', $uts);
1944                         //return gmdate( 'd-M-y h.i.s A', $uts) . ' +00:00';
1945                 case TS_POSTGRES:
1946                         return gmdate( 'Y-m-d H:i:s', $uts) . ' GMT';
1947                 case TS_DB2:
1948                         return gmdate( 'Y-m-d H:i:s', $uts);
1949                 default:
1950                         throw new MWException( 'wfTimestamp() called with illegal output type.');
1951         }
1952 }
1953
1954 /**
1955  * Return a formatted timestamp, or null if input is null.
1956  * For dealing with nullable timestamp columns in the database.
1957  * @param $outputtype Integer
1958  * @param $ts String
1959  * @return String
1960  */
1961 function wfTimestampOrNull( $outputtype = TS_UNIX, $ts = null ) {
1962         if( is_null( $ts ) ) {
1963                 return null;
1964         } else {
1965                 return wfTimestamp( $outputtype, $ts );
1966         }
1967 }
1968
1969 /**
1970  * Check if the operating system is Windows
1971  *
1972  * @return Bool: true if it's Windows, False otherwise.
1973  */
1974 function wfIsWindows() {
1975         if (substr(php_uname(), 0, 7) == 'Windows') {
1976                 return true;
1977         } else {
1978                 return false;
1979         }
1980 }
1981
1982 /**
1983  * Swap two variables
1984  */
1985 function swap( &$x, &$y ) {
1986         $z = $x;
1987         $x = $y;
1988         $y = $z;
1989 }
1990
1991 function wfGetCachedNotice( $name ) {
1992         global $wgOut, $wgRenderHashAppend, $parserMemc;
1993         $fname = 'wfGetCachedNotice';
1994         wfProfileIn( $fname );
1995
1996         $needParse = false;
1997
1998         if( $name === 'default' ) {
1999                 // special case
2000                 global $wgSiteNotice;
2001                 $notice = $wgSiteNotice;
2002                 if( empty( $notice ) ) {
2003                         wfProfileOut( $fname );
2004                         return false;
2005                 }
2006         } else {
2007                 $notice = wfMsgForContentNoTrans( $name );
2008                 if( wfEmptyMsg( $name, $notice ) || $notice == '-' ) {
2009                         wfProfileOut( $fname );
2010                         return( false );
2011                 }
2012         }
2013
2014         // Use the extra hash appender to let eg SSL variants separately cache.
2015         $key = wfMemcKey( $name . $wgRenderHashAppend );
2016         $cachedNotice = $parserMemc->get( $key );
2017         if( is_array( $cachedNotice ) ) {
2018                 if( md5( $notice ) == $cachedNotice['hash'] ) {
2019                         $notice = $cachedNotice['html'];
2020                 } else {
2021                         $needParse = true;
2022                 }
2023         } else {
2024                 $needParse = true;
2025         }
2026
2027         if( $needParse ) {
2028                 if( is_object( $wgOut ) ) {
2029                         $parsed = $wgOut->parse( $notice );
2030                         $parserMemc->set( $key, array( 'html' => $parsed, 'hash' => md5( $notice ) ), 600 );
2031                         $notice = $parsed;
2032                 } else {
2033                         wfDebug( 'wfGetCachedNotice called for ' . $name . ' with no $wgOut available'."\n" );
2034                         $notice = '';
2035                 }
2036         }
2037
2038         wfProfileOut( $fname );
2039         return $notice;
2040 }
2041
2042 function wfGetNamespaceNotice() {
2043         global $wgTitle;
2044
2045         # Paranoia
2046         if ( !isset( $wgTitle ) || !is_object( $wgTitle ) )
2047                 return "";
2048
2049         $fname = 'wfGetNamespaceNotice';
2050         wfProfileIn( $fname );
2051
2052         $key = "namespacenotice-" . $wgTitle->getNsText();
2053         $namespaceNotice = wfGetCachedNotice( $key );
2054         if ( $namespaceNotice && substr ( $namespaceNotice , 0 ,7 ) != "<p>&lt;" ) {
2055                  $namespaceNotice = '<div id="namespacebanner">' . $namespaceNotice . "</div>";
2056         } else {
2057                 $namespaceNotice = "";
2058         }
2059
2060         wfProfileOut( $fname );
2061         return $namespaceNotice;
2062 }
2063
2064 function wfGetSiteNotice() {
2065         global $wgUser, $wgSiteNotice;
2066         $fname = 'wfGetSiteNotice';
2067         wfProfileIn( $fname );
2068         $siteNotice = '';
2069
2070         if( wfRunHooks( 'SiteNoticeBefore', array( &$siteNotice ) ) ) {
2071                 if( is_object( $wgUser ) && $wgUser->isLoggedIn() ) {
2072                         $siteNotice = wfGetCachedNotice( 'sitenotice' );
2073                 } else {
2074                         $anonNotice = wfGetCachedNotice( 'anonnotice' );
2075                         if( !$anonNotice ) {
2076                                 $siteNotice = wfGetCachedNotice( 'sitenotice' );
2077                         } else {
2078                                 $siteNotice = $anonNotice;
2079                         }
2080                 }
2081                 if( !$siteNotice ) {
2082                         $siteNotice = wfGetCachedNotice( 'default' );
2083                 }
2084         }
2085
2086         wfRunHooks( 'SiteNoticeAfter', array( &$siteNotice ) );
2087         wfProfileOut( $fname );
2088         return $siteNotice;
2089 }
2090
2091 /**
2092  * BC wrapper for MimeMagic::singleton()
2093  * @deprecated
2094  */
2095 function &wfGetMimeMagic() {
2096         return MimeMagic::singleton();
2097 }
2098
2099 /**
2100  * Tries to get the system directory for temporary files. For PHP >= 5.2.1,
2101  * we'll use sys_get_temp_dir(). The TMPDIR, TMP, and TEMP environment
2102  * variables are then checked in sequence, and if none are set /tmp is
2103  * returned as the generic Unix default.
2104  *
2105  * NOTE: When possible, use the tempfile() function to create temporary
2106  * files to avoid race conditions on file creation, etc.
2107  *
2108  * @return String
2109  */
2110 function wfTempDir() {
2111         if( function_exists( 'sys_get_temp_dir' ) ) {
2112                 return sys_get_temp_dir();
2113         }
2114         foreach( array( 'TMPDIR', 'TMP', 'TEMP' ) as $var ) {
2115                 $tmp = getenv( $var );
2116                 if( $tmp && file_exists( $tmp ) && is_dir( $tmp ) && is_writable( $tmp ) ) {
2117                         return $tmp;
2118                 }
2119         }
2120         # Hope this is Unix of some kind!
2121         return '/tmp';
2122 }
2123
2124 /**
2125  * Make directory, and make all parent directories if they don't exist
2126  *
2127  * @param $dir String: full path to directory to create
2128  * @param $mode Integer: chmod value to use, default is $wgDirectoryMode
2129  * @param $caller String: optional caller param for debugging.
2130  * @return bool
2131  */
2132 function wfMkdirParents( $dir, $mode = null, $caller = null ) {
2133         global $wgDirectoryMode;
2134
2135         if ( !is_null( $caller ) ) {
2136                 wfDebug( "$caller: called wfMkdirParents($dir)" );
2137         }
2138
2139         if( strval( $dir ) === '' || file_exists( $dir ) )
2140                 return true;
2141
2142         $dir = str_replace( array( '\\', '/' ), DIRECTORY_SEPARATOR, $dir );
2143
2144         if ( is_null( $mode ) )
2145                 $mode = $wgDirectoryMode;
2146
2147         $ok = mkdir( $dir, $mode, true );  // PHP5 <3
2148         if( !$ok ) {
2149                 // PHP doesn't report the path in its warning message, so add our own to aid in diagnosis.
2150                 trigger_error( __FUNCTION__ . ": failed to mkdir \"$dir\" mode $mode", E_USER_WARNING );
2151         }
2152         return $ok;
2153 }
2154
2155 /**
2156  * Increment a statistics counter
2157  */
2158 function wfIncrStats( $key ) {
2159         global $wgStatsMethod;
2160
2161         if( $wgStatsMethod == 'udp' ) {
2162                 global $wgUDPProfilerHost, $wgUDPProfilerPort, $wgDBname;
2163                 static $socket;
2164                 if (!$socket) {
2165                         $socket=socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
2166                         $statline="stats/{$wgDBname} - 1 1 1 1 1 -total\n";
2167                         socket_sendto($socket,$statline,strlen($statline),0,$wgUDPProfilerHost,$wgUDPProfilerPort);
2168                 }
2169                 $statline="stats/{$wgDBname} - 1 1 1 1 1 {$key}\n";
2170                 @socket_sendto($socket,$statline,strlen($statline),0,$wgUDPProfilerHost,$wgUDPProfilerPort);
2171         } elseif( $wgStatsMethod == 'cache' ) {
2172                 global $wgMemc;
2173                 $key = wfMemcKey( 'stats', $key );
2174                 if ( is_null( $wgMemc->incr( $key ) ) ) {
2175                         $wgMemc->add( $key, 1 );
2176                 }
2177         } else {
2178                 // Disabled
2179         }
2180 }
2181
2182 /**
2183  * @param $nr Mixed: the number to format
2184  * @param $acc Integer: the number of digits after the decimal point, default 2
2185  * @param $round Boolean: whether or not to round the value, default true
2186  * @return float
2187  */
2188 function wfPercent( $nr, $acc = 2, $round = true ) {
2189         $ret = sprintf( "%.${acc}f", $nr );
2190         return $round ? round( $ret, $acc ) . '%' : "$ret%";
2191 }
2192
2193 /**
2194  * Encrypt a username/password.
2195  *
2196  * @param $userid Integer: ID of the user
2197  * @param $password String: password of the user
2198  * @return String: hashed password
2199  * @deprecated Use User::crypt() or User::oldCrypt() instead
2200  */
2201 function wfEncryptPassword( $userid, $password ) {
2202         wfDeprecated(__FUNCTION__);
2203         # Just wrap around User::oldCrypt()
2204         return User::oldCrypt($password, $userid);
2205 }
2206
2207 /**
2208  * Appends to second array if $value differs from that in $default
2209  */
2210 function wfAppendToArrayIfNotDefault( $key, $value, $default, &$changed ) {
2211         if ( is_null( $changed ) ) {
2212                 throw new MWException('GlobalFunctions::wfAppendToArrayIfNotDefault got null');
2213         }
2214         if ( $default[$key] !== $value ) {
2215                 $changed[$key] = $value;
2216         }
2217 }
2218
2219 /**
2220  * Since wfMsg() and co suck, they don't return false if the message key they
2221  * looked up didn't exist but a XHTML string, this function checks for the
2222  * nonexistance of messages by looking at wfMsg() output
2223  *
2224  * @param $key      String: the message key looked up
2225  * @return Boolean True if the message *doesn't* exist.
2226  */
2227 function wfEmptyMsg( $key ) {
2228         global $wgMessageCache;
2229         return $wgMessageCache->get( $key, /*useDB*/true, /*content*/false ) === false;
2230 }
2231
2232 /**
2233  * Find out whether or not a mixed variable exists in a string
2234  *
2235  * @param $needle String
2236  * @param $str String
2237  * @return Boolean
2238  */
2239 function in_string( $needle, $str ) {
2240         return strpos( $str, $needle ) !== false;
2241 }
2242
2243 function wfSpecialList( $page, $details ) {
2244         global $wgContLang;
2245         $details = $details ? ' ' . $wgContLang->getDirMark() . "($details)" : "";
2246         return $page . $details;
2247 }
2248
2249 /**
2250  * Returns a regular expression of url protocols
2251  *
2252  * @return String
2253  */
2254 function wfUrlProtocols() {
2255         global $wgUrlProtocols;
2256
2257         static $retval = null;
2258         if ( !is_null( $retval ) )
2259                 return $retval;
2260
2261         // Support old-style $wgUrlProtocols strings, for backwards compatibility
2262         // with LocalSettings files from 1.5
2263         if ( is_array( $wgUrlProtocols ) ) {
2264                 $protocols = array();
2265                 foreach ($wgUrlProtocols as $protocol)
2266                         $protocols[] = preg_quote( $protocol, '/' );
2267
2268                 $retval = implode( '|', $protocols );
2269         } else {
2270                 $retval = $wgUrlProtocols;
2271         }
2272         return $retval;
2273 }
2274
2275 /**
2276  * Safety wrapper around ini_get() for boolean settings.
2277  * The values returned from ini_get() are pre-normalized for settings
2278  * set via php.ini or php_flag/php_admin_flag... but *not*
2279  * for those set via php_value/php_admin_value.
2280  *
2281  * It's fairly common for people to use php_value instead of php_flag,
2282  * which can leave you with an 'off' setting giving a false positive
2283  * for code that just takes the ini_get() return value as a boolean.
2284  *
2285  * To make things extra interesting, setting via php_value accepts
2286  * "true" and "yes" as true, but php.ini and php_flag consider them false. :)
2287  * Unrecognized values go false... again opposite PHP's own coercion
2288  * from string to bool.
2289  *
2290  * Luckily, 'properly' set settings will always come back as '0' or '1',
2291  * so we only have to worry about them and the 'improper' settings.
2292  *
2293  * I frickin' hate PHP... :P
2294  *
2295  * @param $setting String
2296  * @return Bool
2297  */
2298 function wfIniGetBool( $setting ) {
2299         $val = ini_get( $setting );
2300         // 'on' and 'true' can't have whitespace around them, but '1' can.
2301         return strtolower( $val ) == 'on'
2302                 || strtolower( $val ) == 'true'
2303                 || strtolower( $val ) == 'yes'
2304                 || preg_match( "/^\s*[+-]?0*[1-9]/", $val ); // approx C atoi() function
2305 }
2306
2307 /**
2308  * Execute a shell command, with time and memory limits mirrored from the PHP
2309  * configuration if supported.
2310  * @param $cmd Command line, properly escaped for shell.
2311  * @param &$retval optional, will receive the program's exit code.
2312  *                 (non-zero is usually failure)
2313  * @return collected stdout as a string (trailing newlines stripped)
2314  */
2315 function wfShellExec( $cmd, &$retval=null ) {
2316         global $IP, $wgMaxShellMemory, $wgMaxShellFileSize, $wgMaxShellTime;
2317
2318         static $disabled;
2319         if ( is_null( $disabled ) ) {
2320                 $disabled = false;
2321                 if( wfIniGetBool( 'safe_mode' ) ) {
2322                         wfDebug( "wfShellExec can't run in safe_mode, PHP's exec functions are too broken.\n" );
2323                         $disabled = true;
2324                 }
2325                 $functions = explode( ',', ini_get( 'disable_functions' ) );
2326                 $functions = array_map( 'trim', $functions );
2327                 $functions = array_map( 'strtolower', $functions );
2328                 if ( in_array( 'passthru', $functions ) ) {
2329                         wfDebug( "passthru is in disabled_functions\n" );
2330                         $disabled = true;
2331                 }
2332         }
2333         if ( $disabled ) {
2334                 $retval = 1;
2335                 return "Unable to run external programs in safe mode.";
2336         }
2337
2338         wfInitShellLocale();
2339
2340         if ( php_uname( 's' ) == 'Linux' ) {
2341                 $time = intval( $wgMaxShellTime );
2342                 $mem = intval( $wgMaxShellMemory );
2343                 $filesize = intval( $wgMaxShellFileSize );
2344
2345                 if ( $time > 0 && $mem > 0 ) {
2346                         $script = "$IP/bin/ulimit4.sh";
2347                         if ( is_executable( $script ) ) {
2348                                 $cmd = escapeshellarg( $script ) . " $time $mem $filesize " . escapeshellarg( $cmd );
2349                         }
2350                 }
2351         } elseif ( php_uname( 's' ) == 'Windows NT' &&
2352                 version_compare( PHP_VERSION, '5.3.0', '<' ) )
2353         {
2354                 # This is a hack to work around PHP's flawed invocation of cmd.exe
2355                 # http://news.php.net/php.internals/21796
2356                 # Which is fixed in 5.3.0 :)
2357                 $cmd = '"' . $cmd . '"';
2358         }
2359         wfDebug( "wfShellExec: $cmd\n" );
2360
2361         $retval = 1; // error by default?
2362         ob_start();
2363         passthru( $cmd, $retval );
2364         $output = ob_get_contents();
2365         ob_end_clean();
2366
2367         if ( $retval == 127 ) {
2368                 wfDebugLog( 'exec', "Possibly missing executable file: $cmd\n" );
2369         }
2370         return $output;
2371 }
2372
2373 /**
2374  * Workaround for http://bugs.php.net/bug.php?id=45132
2375  * escapeshellarg() destroys non-ASCII characters if LANG is not a UTF-8 locale
2376  */
2377 function wfInitShellLocale() {
2378         static $done = false;
2379         if ( $done ) return;
2380         $done = true;
2381         global $wgShellLocale;
2382         if ( !wfIniGetBool( 'safe_mode' ) ) {
2383                 putenv( "LC_CTYPE=$wgShellLocale" );
2384                 setlocale( LC_CTYPE, $wgShellLocale );
2385         }
2386 }
2387
2388 /**
2389  * This function works like "use VERSION" in Perl, the program will die with a
2390  * backtrace if the current version of PHP is less than the version provided
2391  *
2392  * This is useful for extensions which due to their nature are not kept in sync
2393  * with releases, and might depend on other versions of PHP than the main code
2394  *
2395  * Note: PHP might die due to parsing errors in some cases before it ever
2396  *       manages to call this function, such is life
2397  *
2398  * @see perldoc -f use
2399  *
2400  * @param $req_ver Mixed: the version to check, can be a string, an integer, or
2401  *                 a float
2402  */
2403 function wfUsePHP( $req_ver ) {
2404         $php_ver = PHP_VERSION;
2405
2406         if ( version_compare( $php_ver, (string)$req_ver, '<' ) )
2407                  throw new MWException( "PHP $req_ver required--this is only $php_ver" );
2408 }
2409
2410 /**
2411  * This function works like "use VERSION" in Perl except it checks the version
2412  * of MediaWiki, the program will die with a backtrace if the current version
2413  * of MediaWiki is less than the version provided.
2414  *
2415  * This is useful for extensions which due to their nature are not kept in sync
2416  * with releases
2417  *
2418  * @see perldoc -f use
2419  *
2420  * @param $req_ver Mixed: the version to check, can be a string, an integer, or
2421  *                 a float
2422  */
2423 function wfUseMW( $req_ver ) {
2424         global $wgVersion;
2425
2426         if ( version_compare( $wgVersion, (string)$req_ver, '<' ) )
2427                 throw new MWException( "MediaWiki $req_ver required--this is only $wgVersion" );
2428 }
2429
2430 /**
2431  * @deprecated use StringUtils::escapeRegexReplacement
2432  */
2433 function wfRegexReplacement( $string ) {
2434         return StringUtils::escapeRegexReplacement( $string );
2435 }
2436
2437 /**
2438  * Return the final portion of a pathname.
2439  * Reimplemented because PHP5's basename() is buggy with multibyte text.
2440  * http://bugs.php.net/bug.php?id=33898
2441  *
2442  * PHP's basename() only considers '\' a pathchar on Windows and Netware.
2443  * We'll consider it so always, as we don't want \s in our Unix paths either.
2444  *
2445  * @param $path String
2446  * @param $suffix String: to remove if present
2447  * @return String
2448  */
2449 function wfBaseName( $path, $suffix='' ) {
2450         $encSuffix = ($suffix == '')
2451                 ? ''
2452                 : ( '(?:' . preg_quote( $suffix, '#' ) . ')?' );
2453         $matches = array();
2454         if( preg_match( "#([^/\\\\]*?){$encSuffix}[/\\\\]*$#", $path, $matches ) ) {
2455                 return $matches[1];
2456         } else {
2457                 return '';
2458         }
2459 }
2460
2461 /**
2462  * Generate a relative path name to the given file.
2463  * May explode on non-matching case-insensitive paths,
2464  * funky symlinks, etc.
2465  *
2466  * @param $path String: absolute destination path including target filename
2467  * @param $from String: Absolute source path, directory only
2468  * @return String
2469  */
2470 function wfRelativePath( $path, $from ) {
2471         // Normalize mixed input on Windows...
2472         $path = str_replace( '/', DIRECTORY_SEPARATOR, $path );
2473         $from = str_replace( '/', DIRECTORY_SEPARATOR, $from );
2474
2475         // Trim trailing slashes -- fix for drive root
2476         $path = rtrim( $path, DIRECTORY_SEPARATOR );
2477         $from = rtrim( $from, DIRECTORY_SEPARATOR );
2478
2479         $pieces  = explode( DIRECTORY_SEPARATOR, dirname( $path ) );
2480         $against = explode( DIRECTORY_SEPARATOR, $from );
2481
2482         if( $pieces[0] !== $against[0] ) {
2483                 // Non-matching Windows drive letters?
2484                 // Return a full path.
2485                 return $path;
2486         }
2487
2488         // Trim off common prefix
2489         while( count( $pieces ) && count( $against )
2490                 && $pieces[0] == $against[0] ) {
2491                 array_shift( $pieces );
2492                 array_shift( $against );
2493         }
2494
2495         // relative dots to bump us to the parent
2496         while( count( $against ) ) {
2497                 array_unshift( $pieces, '..' );
2498                 array_shift( $against );
2499         }
2500
2501         array_push( $pieces, wfBaseName( $path ) );
2502
2503         return implode( DIRECTORY_SEPARATOR, $pieces );
2504 }
2505
2506 /**
2507  * Backwards array plus for people who haven't bothered to read the PHP manual
2508  * XXX: will not darn your socks for you.
2509  *
2510  * @param $array1 Array
2511  * @param [$array2, [...]] Arrays
2512  * @return Array
2513  */
2514 function wfArrayMerge( $array1/* ... */ ) {
2515         $args = func_get_args();
2516         $args = array_reverse( $args, true );
2517         $out = array();
2518         foreach ( $args as $arg ) {
2519                 $out += $arg;
2520         }
2521         return $out;
2522 }
2523
2524 /**
2525  * Merge arrays in the style of getUserPermissionsErrors, with duplicate removal
2526  * e.g.
2527  *      wfMergeErrorArrays(
2528  *              array( array( 'x' ) ),
2529  *              array( array( 'x', '2' ) ),
2530  *              array( array( 'x' ) ),
2531  *              array( array( 'y') )
2532  *      );
2533  * returns:
2534  *              array(
2535  *              array( 'x', '2' ),
2536  *              array( 'x' ),
2537  *              array( 'y' )
2538  *      )
2539  */
2540 function wfMergeErrorArrays( /*...*/ ) {
2541         $args = func_get_args();
2542         $out = array();
2543         foreach ( $args as $errors ) {
2544                 foreach ( $errors as $params ) {
2545                         # FIXME: sometimes get nested arrays for $params,
2546                         # which leads to E_NOTICEs
2547                         $spec = implode( "\t", $params );
2548                         $out[$spec] = $params;
2549                 }
2550         }
2551         return array_values( $out );
2552 }
2553
2554 /**
2555  * parse_url() work-alike, but non-broken.  Differences:
2556  *
2557  * 1) Does not raise warnings on bad URLs (just returns false)
2558  * 2) Handles protocols that don't use :// (e.g., mailto: and news:) correctly
2559  * 3) Adds a "delimiter" element to the array, either '://' or ':' (see (2))
2560  *
2561  * @param $url String: a URL to parse
2562  * @return Array: bits of the URL in an associative array, per PHP docs
2563  */
2564 function wfParseUrl( $url ) {
2565         global $wgUrlProtocols; // Allow all protocols defined in DefaultSettings/LocalSettings.php
2566         wfSuppressWarnings();
2567         $bits = parse_url( $url );
2568         wfRestoreWarnings();
2569         if ( !$bits ) {
2570                 return false;
2571         }
2572
2573         // most of the protocols are followed by ://, but mailto: and sometimes news: not, check for it
2574         if ( in_array( $bits['scheme'] . '://', $wgUrlProtocols ) ) {
2575                 $bits['delimiter'] = '://';
2576         } elseif ( in_array( $bits['scheme'] . ':', $wgUrlProtocols ) ) {
2577                 $bits['delimiter'] = ':';
2578                 // parse_url detects for news: and mailto: the host part of an url as path
2579                 // We have to correct this wrong detection
2580                 if ( isset ( $bits['path'] ) ) {
2581                         $bits['host'] = $bits['path'];
2582                         $bits['path'] = '';
2583                 }
2584         } else {
2585                 return false;
2586         }
2587
2588         return $bits;
2589 }
2590
2591 /**
2592  * Make a URL index, appropriate for the el_index field of externallinks.
2593  */
2594 function wfMakeUrlIndex( $url ) {
2595         $bits = wfParseUrl( $url );
2596
2597         // Reverse the labels in the hostname, convert to lower case
2598         // For emails reverse domainpart only
2599         if ( $bits['scheme'] == 'mailto' ) {
2600                 $mailparts = explode( '@', $bits['host'], 2 );
2601                 if ( count($mailparts) === 2 ) {
2602                         $domainpart = strtolower( implode( '.', array_reverse( explode( '.', $mailparts[1] ) ) ) );
2603                 } else {
2604                         // No domain specified, don't mangle it
2605                         $domainpart = '';
2606                 }
2607                 $reversedHost = $domainpart . '@' . $mailparts[0];
2608         } else {
2609                 $reversedHost = strtolower( implode( '.', array_reverse( explode( '.', $bits['host'] ) ) ) );
2610         }
2611         // Add an extra dot to the end
2612         // Why? Is it in wrong place in mailto links?
2613         if ( substr( $reversedHost, -1, 1 ) !== '.' ) {
2614                 $reversedHost .= '.';
2615         }
2616         // Reconstruct the pseudo-URL
2617         $prot = $bits['scheme'];
2618         $index = $prot . $bits['delimiter'] . $reversedHost;
2619         // Leave out user and password. Add the port, path, query and fragment
2620         if ( isset( $bits['port'] ) )      $index .= ':' . $bits['port'];
2621         if ( isset( $bits['path'] ) ) {
2622                 $index .= $bits['path'];
2623         } else {
2624                 $index .= '/';
2625         }
2626         if ( isset( $bits['query'] ) )     $index .= '?' . $bits['query'];
2627         if ( isset( $bits['fragment'] ) )  $index .= '#' . $bits['fragment'];
2628         return $index;
2629 }
2630
2631 /**
2632  * Do any deferred updates and clear the list
2633  * TODO: This could be in Wiki.php if that class made any sense at all
2634  */
2635 function wfDoUpdates()
2636 {
2637         global $wgPostCommitUpdateList, $wgDeferredUpdateList;
2638         foreach ( $wgDeferredUpdateList as $update ) {
2639                 $update->doUpdate();
2640         }
2641         foreach ( $wgPostCommitUpdateList as $update ) {
2642                 $update->doUpdate();
2643         }
2644         $wgDeferredUpdateList = array();
2645         $wgPostCommitUpdateList = array();
2646 }
2647
2648 /**
2649  * @deprecated use StringUtils::explodeMarkup
2650  */
2651 function wfExplodeMarkup( $separator, $text ) {
2652         return StringUtils::explodeMarkup( $separator, $text );
2653 }
2654
2655 /**
2656  * Convert an arbitrarily-long digit string from one numeric base
2657  * to another, optionally zero-padding to a minimum column width.
2658  *
2659  * Supports base 2 through 36; digit values 10-36 are represented
2660  * as lowercase letters a-z. Input is case-insensitive.
2661  *
2662  * @param $input String: of digits
2663  * @param $sourceBase Integer: 2-36
2664  * @param $destBase Integer: 2-36
2665  * @param $pad Integer: 1 or greater
2666  * @param $lowercase Boolean
2667  * @return String or false on invalid input
2668  */
2669 function wfBaseConvert( $input, $sourceBase, $destBase, $pad=1, $lowercase=true ) {
2670         $input = strval( $input );
2671         if( $sourceBase < 2 ||
2672                 $sourceBase > 36 ||
2673                 $destBase < 2 ||
2674                 $destBase > 36 ||
2675                 $pad < 1 ||
2676                 $sourceBase != intval( $sourceBase ) ||
2677                 $destBase != intval( $destBase ) ||
2678                 $pad != intval( $pad ) ||
2679                 !is_string( $input ) ||
2680                 $input == '' ) {
2681                 return false;
2682         }
2683         $digitChars = ( $lowercase ) ?  '0123456789abcdefghijklmnopqrstuvwxyz' : '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
2684         $inDigits = array();
2685         $outChars = '';
2686
2687         // Decode and validate input string
2688         $input = strtolower( $input );
2689         for( $i = 0; $i < strlen( $input ); $i++ ) {
2690                 $n = strpos( $digitChars, $input{$i} );
2691                 if( $n === false || $n > $sourceBase ) {
2692                         return false;
2693                 }
2694                 $inDigits[] = $n;
2695         }
2696
2697         // Iterate over the input, modulo-ing out an output digit
2698         // at a time until input is gone.
2699         while( count( $inDigits ) ) {
2700                 $work = 0;
2701                 $workDigits = array();
2702
2703                 // Long division...
2704                 foreach( $inDigits as $digit ) {
2705                         $work *= $sourceBase;
2706                         $work += $digit;
2707
2708                         if( $work < $destBase ) {
2709                                 // Gonna need to pull another digit.
2710                                 if( count( $workDigits ) ) {
2711                                         // Avoid zero-padding; this lets us find
2712                                         // the end of the input very easily when
2713                                         // length drops to zero.
2714                                         $workDigits[] = 0;
2715                                 }
2716                         } else {
2717                                 // Finally! Actual division!
2718                                 $workDigits[] = intval( $work / $destBase );
2719
2720                                 // Isn't it annoying that most programming languages
2721                                 // don't have a single divide-and-remainder operator,
2722                                 // even though the CPU implements it that way?
2723                                 $work = $work % $destBase;
2724                         }
2725                 }
2726
2727                 // All that division leaves us with a remainder,
2728                 // which is conveniently our next output digit.
2729                 $outChars .= $digitChars[$work];
2730
2731                 // And we continue!
2732                 $inDigits = $workDigits;
2733         }
2734
2735         while( strlen( $outChars ) < $pad ) {
2736                 $outChars .= '0';
2737         }
2738
2739         return strrev( $outChars );
2740 }
2741
2742 /**
2743  * Create an object with a given name and an array of construct parameters
2744  * @param $name String
2745  * @param $p Array: parameters
2746  */
2747 function wfCreateObject( $name, $p ){
2748         $p = array_values( $p );
2749         switch ( count( $p ) ) {
2750                 case 0:
2751                         return new $name;
2752                 case 1:
2753                         return new $name( $p[0] );
2754                 case 2:
2755                         return new $name( $p[0], $p[1] );
2756                 case 3:
2757                         return new $name( $p[0], $p[1], $p[2] );
2758                 case 4:
2759                         return new $name( $p[0], $p[1], $p[2], $p[3] );
2760                 case 5:
2761                         return new $name( $p[0], $p[1], $p[2], $p[3], $p[4] );
2762                 case 6:
2763                         return new $name( $p[0], $p[1], $p[2], $p[3], $p[4], $p[5] );
2764                 default:
2765                         throw new MWException( "Too many arguments to construtor in wfCreateObject" );
2766         }
2767 }
2768
2769 /**
2770  * Alias for modularized function
2771  * @deprecated Use Http::isLocalURL() instead
2772  */
2773 function wfIsLocalURL( $url ) {
2774         wfDeprecated(__FUNCTION__);
2775         return Http::isLocalURL( $url );
2776 }
2777
2778 function wfHttpOnlySafe() {
2779         global $wgHttpOnlyBlacklist;
2780         if( !version_compare("5.2", PHP_VERSION, "<") )
2781                 return false;
2782
2783         if( isset( $_SERVER['HTTP_USER_AGENT'] ) ) {
2784                 foreach( $wgHttpOnlyBlacklist as $regex ) {
2785                         if( preg_match( $regex, $_SERVER['HTTP_USER_AGENT'] ) ) {
2786                                 return false;
2787                         }
2788                 }
2789         }
2790
2791         return true;
2792 }
2793
2794 /**
2795  * Initialise php session
2796  */
2797 function wfSetupSession() {
2798         global $wgSessionsInMemcached, $wgCookiePath, $wgCookieDomain,
2799                         $wgCookieSecure, $wgCookieHttpOnly, $wgSessionHandler;
2800         if( $wgSessionsInMemcached ) {
2801                 require_once( 'MemcachedSessions.php' );
2802         } elseif( $wgSessionHandler && $wgSessionHandler != ini_get( 'session.save_handler' ) ) {
2803                 # Only set this if $wgSessionHandler isn't null and session.save_handler
2804                 # hasn't already been set to the desired value (that causes errors)
2805                 ini_set ( 'session.save_handler', $wgSessionHandler );
2806         }
2807         $httpOnlySafe = wfHttpOnlySafe();
2808         wfDebugLog( 'cookie',
2809                 'session_set_cookie_params: "' . implode( '", "',
2810                         array(
2811                                 0,
2812                                 $wgCookiePath,
2813                                 $wgCookieDomain,
2814                                 $wgCookieSecure,
2815                                 $httpOnlySafe && $wgCookieHttpOnly ) ) . '"' );
2816         if( $httpOnlySafe && $wgCookieHttpOnly ) {
2817                 session_set_cookie_params( 0, $wgCookiePath, $wgCookieDomain, $wgCookieSecure, $wgCookieHttpOnly );
2818         } else {
2819                 // PHP 5.1 throws warnings if you pass the HttpOnly parameter for 5.2.
2820                 session_set_cookie_params( 0, $wgCookiePath, $wgCookieDomain, $wgCookieSecure );
2821         }
2822         session_cache_limiter( 'private, must-revalidate' );
2823         wfSuppressWarnings();
2824         session_start();
2825         wfRestoreWarnings();
2826 }
2827
2828 /**
2829  * Get an object from the precompiled serialized directory
2830  *
2831  * @return Mixed: the variable on success, false on failure
2832  */
2833 function wfGetPrecompiledData( $name ) {
2834         global $IP;
2835
2836         $file = "$IP/serialized/$name";
2837         if ( file_exists( $file ) ) {
2838                 $blob = file_get_contents( $file );
2839                 if ( $blob ) {
2840                         return unserialize( $blob );
2841                 }
2842         }
2843         return false;
2844 }
2845
2846 function wfGetCaller( $level = 2 ) {
2847         $backtrace = wfDebugBacktrace();
2848         if ( isset( $backtrace[$level] ) ) {
2849                 return wfFormatStackFrame($backtrace[$level]);
2850         } else {
2851                 $caller = 'unknown';
2852         }
2853         return $caller;
2854 }
2855
2856 /**
2857  * Return a string consisting all callers in stack, somewhat useful sometimes
2858  * for profiling specific points
2859  */
2860 function wfGetAllCallers() {
2861         return implode('/', array_map('wfFormatStackFrame',array_reverse(wfDebugBacktrace())));
2862 }
2863
2864 /**
2865  * Return a string representation of frame
2866  */
2867 function wfFormatStackFrame($frame) {
2868         return isset( $frame["class"] )?
2869                 $frame["class"]."::".$frame["function"]:
2870                 $frame["function"];
2871 }
2872
2873 /**
2874  * Get a cache key
2875  */
2876 function wfMemcKey( /*... */ ) {
2877         $args = func_get_args();
2878         $key = wfWikiID() . ':' . implode( ':', $args );
2879         $key = str_replace( ' ', '_', $key );
2880         return $key;
2881 }
2882
2883 /**
2884  * Get a cache key for a foreign DB
2885  */
2886 function wfForeignMemcKey( $db, $prefix /*, ... */ ) {
2887         $args = array_slice( func_get_args(), 2 );
2888         if ( $prefix ) {
2889                 $key = "$db-$prefix:" . implode( ':', $args );
2890         } else {
2891                 $key = $db . ':' . implode( ':', $args );
2892         }
2893         return $key;
2894 }
2895
2896 /**
2897  * Get an ASCII string identifying this wiki
2898  * This is used as a prefix in memcached keys
2899  */
2900 function wfWikiID() {
2901         global $wgDBprefix, $wgDBname;
2902         if ( $wgDBprefix ) {
2903                 return "$wgDBname-$wgDBprefix";
2904         } else {
2905                 return $wgDBname;
2906         }
2907 }
2908
2909 /**
2910  * Split a wiki ID into DB name and table prefix
2911  */
2912 function wfSplitWikiID( $wiki ) {
2913         $bits = explode( '-', $wiki, 2 );
2914         if ( count( $bits ) < 2 ) {
2915                 $bits[] = '';
2916         }
2917         return $bits;
2918 }
2919
2920 /*
2921  * Get a Database object.
2922  * @param $db Integer: index of the connection to get. May be DB_MASTER for the
2923  *            master (for write queries), DB_SLAVE for potentially lagged read
2924  *            queries, or an integer >= 0 for a particular server.
2925  *
2926  * @param $groups Mixed: query groups. An array of group names that this query
2927  *                belongs to. May contain a single string if the query is only
2928  *                in one group.
2929  *
2930  * @param $wiki String: the wiki ID, or false for the current wiki
2931  *
2932  * Note: multiple calls to wfGetDB(DB_SLAVE) during the course of one request
2933  * will always return the same object, unless the underlying connection or load
2934  * balancer is manually destroyed.
2935  */
2936 function &wfGetDB( $db, $groups = array(), $wiki = false ) {
2937         return wfGetLB( $wiki )->getConnection( $db, $groups, $wiki );
2938 }
2939
2940 /**
2941  * Get a load balancer object.
2942  *
2943  * @param $wiki String: wiki ID, or false for the current wiki
2944  * @return LoadBalancer
2945  */
2946 function wfGetLB( $wiki = false ) {
2947         return wfGetLBFactory()->getMainLB( $wiki );
2948 }
2949
2950 /**
2951  * Get the load balancer factory object
2952  */
2953 function &wfGetLBFactory() {
2954         return LBFactory::singleton();
2955 }
2956
2957 /**
2958  * Find a file.
2959  * Shortcut for RepoGroup::singleton()->findFile()
2960  * @param $title Either a string or Title object
2961  * @param $options Associative array of options:
2962  *     time:           requested time for an archived image, or false for the
2963  *                     current version. An image object will be returned which was
2964  *                     created at the specified time.
2965  *
2966  *     ignoreRedirect: If true, do not follow file redirects
2967  *
2968  *     private:        If true, return restricted (deleted) files if the current
2969  *                     user is allowed to view them. Otherwise, such files will not
2970  *                     be found.
2971  *
2972  *     bypassCache:    If true, do not use the process-local cache of File objects
2973  *
2974  * @return File, or false if the file does not exist
2975  */
2976 function wfFindFile( $title, $options = array() ) {
2977         return RepoGroup::singleton()->findFile( $title, $options );
2978 }
2979
2980 /**
2981  * Get an object referring to a locally registered file.
2982  * Returns a valid placeholder object if the file does not exist.
2983  * @param $title Either a string or Title object
2984  * @return File, or null if passed an invalid Title
2985  */
2986 function wfLocalFile( $title ) {
2987         return RepoGroup::singleton()->getLocalRepo()->newFile( $title );
2988 }
2989
2990 /**
2991  * Should low-performance queries be disabled?
2992  *
2993  * @return Boolean
2994  */
2995 function wfQueriesMustScale() {
2996         global $wgMiserMode;
2997         return $wgMiserMode
2998                 || ( SiteStats::pages() > 100000
2999                 && SiteStats::edits() > 1000000
3000                 && SiteStats::users() > 10000 );
3001 }
3002
3003 /**
3004  * Get the path to a specified script file, respecting file
3005  * extensions; this is a wrapper around $wgScriptExtension etc.
3006  *
3007  * @param $script String: script filename, sans extension
3008  * @return String
3009  */
3010 function wfScript( $script = 'index' ) {
3011         global $wgScriptPath, $wgScriptExtension;
3012         return "{$wgScriptPath}/{$script}{$wgScriptExtension}";
3013 }
3014 /**
3015  * Get the script url.
3016  *
3017  * @return script url
3018  */
3019 function wfGetScriptUrl(){
3020         if( isset( $_SERVER['SCRIPT_NAME'] ) ) {
3021                 #
3022                 # as it was called, minus the query string.
3023                 #
3024                 # Some sites use Apache rewrite rules to handle subdomains,
3025                 # and have PHP set up in a weird way that causes PHP_SELF
3026                 # to contain the rewritten URL instead of the one that the
3027                 # outside world sees.
3028                 #
3029                 # If in this mode, use SCRIPT_URL instead, which mod_rewrite
3030                 # provides containing the "before" URL.
3031                 return $_SERVER['SCRIPT_NAME'];
3032         } else {
3033                 return $_SERVER['URL'];
3034         }
3035 }
3036
3037 /**
3038  * Convenience function converts boolean values into "true"
3039  * or "false" (string) values
3040  *
3041  * @param $value Boolean
3042  * @return String
3043  */
3044 function wfBoolToStr( $value ) {
3045         return $value ? 'true' : 'false';
3046 }
3047
3048 /**
3049  * Load an extension messages file
3050  * @deprecated in 1.16 (warnings in 1.18, removed in ?)
3051  */
3052 function wfLoadExtensionMessages( $extensionName, $langcode = false ) {
3053 }
3054
3055 /**
3056  * Get a platform-independent path to the null file, e.g.
3057  * /dev/null
3058  *
3059  * @return string
3060  */
3061 function wfGetNull() {
3062         return wfIsWindows()
3063                 ? 'NUL'
3064                 : '/dev/null';
3065 }
3066
3067 /**
3068  * Displays a maxlag error
3069  *
3070  * @param $host String: server that lags the most
3071  * @param $lag Integer: maxlag (actual)
3072  * @param $maxLag Integer: maxlag (requested)
3073  */
3074 function wfMaxlagError( $host, $lag, $maxLag ) {
3075         global $wgShowHostnames;
3076         header( 'HTTP/1.1 503 Service Unavailable' );
3077         header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
3078         header( 'X-Database-Lag: ' . intval( $lag ) );
3079         header( 'Content-Type: text/plain' );
3080         if( $wgShowHostnames ) {
3081                 echo "Waiting for $host: $lag seconds lagged\n";
3082         } else {
3083                 echo "Waiting for a database server: $lag seconds lagged\n";
3084         }
3085 }
3086
3087 /**
3088  * Throws a warning that $function is deprecated
3089  * @param $function String
3090  * @return null
3091  */
3092 function wfDeprecated( $function ) {
3093         static $functionsWarned = array();
3094         if ( !isset( $functionsWarned[$function] ) ) {
3095                 $functionsWarned[$function] = true;
3096                 wfWarn( "Use of $function is deprecated.", 2 );
3097         }
3098 }
3099
3100 /**
3101  * Send a warning either to the debug log or in a PHP error depending on
3102  * $wgDevelopmentWarnings
3103  *
3104  * @param $msg String: message to send
3105  * @param $callerOffset Integer: number of itmes to go back in the backtrace to
3106  *        find the correct caller (1 = function calling wfWarn, ...)
3107  * @param $level Integer: PHP error level; only used when $wgDevelopmentWarnings
3108  *        is true
3109  */
3110 function wfWarn( $msg, $callerOffset = 1, $level = E_USER_NOTICE ) {
3111         $callers = wfDebugBacktrace();
3112         if( isset( $callers[$callerOffset+1] ) ){
3113                 $callerfunc = $callers[$callerOffset+1];
3114                 $callerfile = $callers[$callerOffset];
3115                 if( isset( $callerfile['file'] ) && isset( $callerfile['line'] ) ){
3116                         $file = $callerfile['file'] . ' at line ' . $callerfile['line'];
3117                 } else {
3118                         $file = '(internal function)';
3119                 }
3120                 $func = '';
3121                 if( isset( $callerfunc['class'] ) )
3122                         $func .= $callerfunc['class'] . '::';
3123                 $func .= @$callerfunc['function'];
3124                 $msg .= " [Called from $func in $file]";
3125         }
3126
3127         global $wgDevelopmentWarnings;
3128         if ( $wgDevelopmentWarnings ) {
3129                 trigger_error( $msg, $level );
3130         } else {
3131                 wfDebug( "$msg\n" );
3132         }
3133 }
3134
3135 /**
3136  * Sleep until the worst slave's replication lag is less than or equal to
3137  * $maxLag, in seconds.  Use this when updating very large numbers of rows, as
3138  * in maintenance scripts, to avoid causing too much lag.  Of course, this is
3139  * a no-op if there are no slaves.
3140  *
3141  * Every time the function has to wait for a slave, it will print a message to
3142  * that effect (and then sleep for a little while), so it's probably not best
3143  * to use this outside maintenance scripts in its present form.
3144  *
3145  * @param $maxLag Integer
3146  * @param $wiki mixed Wiki identifier accepted by wfGetLB
3147  * @return null
3148  */
3149 function wfWaitForSlaves( $maxLag, $wiki = false ) {
3150         if( $maxLag ) {
3151                 $lb = wfGetLB( $wiki );
3152                 list( $host, $lag ) = $lb->getMaxLag( $wiki );
3153                 while( $lag > $maxLag ) {
3154                         $name = @gethostbyaddr( $host );
3155                         if( $name !== false ) {
3156                                 $host = $name;
3157                         }
3158                         print "Waiting for $host (lagged $lag seconds)...\n";
3159                         sleep($maxLag);
3160                         list( $host, $lag ) = $lb->getMaxLag();
3161                 }
3162         }
3163 }
3164
3165 /**
3166  * Output some plain text in command-line mode or in the installer (updaters.inc).
3167  * Do not use it in any other context, its behaviour is subject to change.
3168  */
3169 function wfOut( $s ) {
3170         static $lineStarted = false;
3171         global $wgCommandLineMode;
3172         if ( $wgCommandLineMode && !defined( 'MEDIAWIKI_INSTALL' ) ) {
3173                 echo $s;
3174         } else {
3175                 echo htmlspecialchars( $s );
3176         }
3177         flush();
3178 }
3179
3180 /**
3181  * Count down from $n to zero on the terminal, with a one-second pause
3182  * between showing each number. For use in command-line scripts.
3183  */
3184 function wfCountDown( $n ) {
3185         for ( $i = $n; $i >= 0; $i-- ) {
3186                 if ( $i != $n ) {
3187                         echo str_repeat( "\x08", strlen( $i + 1 ) );
3188                 }
3189                 echo $i;
3190                 flush();
3191                 if ( $i ) {
3192                         sleep( 1 );
3193                 }
3194         }
3195         echo "\n";
3196 }
3197
3198 /** Generate a random 32-character hexadecimal token.
3199  * @param $salt Mixed: some sort of salt, if necessary, to add to random
3200  *              characters before hashing.
3201  */
3202 function wfGenerateToken( $salt = '' ) {
3203         $salt = serialize($salt);
3204
3205         return md5( mt_rand( 0, 0x7fffffff ) . $salt );
3206 }
3207
3208 /**
3209  * Replace all invalid characters with -
3210  * @param $name Mixed: filename to process
3211  */
3212 function wfStripIllegalFilenameChars( $name ) {
3213         global $wgIllegalFileChars;
3214         $name = wfBaseName( $name );
3215         $name = preg_replace("/[^".Title::legalChars()."]".($wgIllegalFileChars ? "|[".$wgIllegalFileChars."]":"")."/",'-',$name);
3216         return $name;
3217 }
3218
3219 /**
3220  * Insert array into another array after the specified *KEY*
3221  * @param $array Array: The array.
3222  * @param $insert Array: The array to insert.
3223  * @param $after Mixed: The key to insert after
3224  */
3225 function wfArrayInsertAfter( $array, $insert, $after ) {
3226         // Find the offset of the element to insert after.
3227         $keys = array_keys($array);
3228         $offsetByKey = array_flip( $keys );
3229
3230         $offset = $offsetByKey[$after];
3231
3232         // Insert at the specified offset
3233         $before = array_slice( $array, 0, $offset + 1, true );
3234         $after = array_slice( $array, $offset + 1, count($array)-$offset, true );
3235
3236         $output = $before + $insert + $after;
3237
3238         return $output;
3239 }
3240
3241 /* Recursively converts the parameter (an object) to an array with the same data */
3242 function wfObjectToArray( $object, $recursive = true ) {
3243         $array = array();
3244         foreach ( get_object_vars($object) as $key => $value ) {
3245                 if ( is_object($value) && $recursive ) {
3246                         $value = wfObjectToArray( $value );
3247                 }
3248
3249                 $array[$key] = $value;
3250         }
3251
3252         return $array;
3253 }
3254
3255 /**
3256  * Set PHP's memory limit to the larger of php.ini or $wgMemoryLimit;
3257  * @return Integer value memory was set to.
3258  */
3259
3260 function wfMemoryLimit () {
3261         global $wgMemoryLimit;
3262         $memlimit = wfShorthandToInteger( ini_get( "memory_limit" ) );
3263         $conflimit = wfShorthandToInteger( $wgMemoryLimit );
3264         if( $memlimit != -1 ) {
3265                 if( $conflimit == -1 ) {
3266                         wfDebug( "Removing PHP's memory limit\n" );
3267                         wfSuppressWarnings();
3268                         ini_set( "memory_limit", $conflimit );
3269                         wfRestoreWarnings();
3270                         return $conflimit;
3271                 } elseif ( $conflimit > $memlimit ) {
3272                         wfDebug( "Raising PHP's memory limit to $conflimit bytes\n" );
3273                         wfSuppressWarnings();
3274                         ini_set( "memory_limit", $conflimit );
3275                         wfRestoreWarnings();
3276                         return $conflimit;
3277                 }
3278         }
3279         return $memlimit;
3280 }
3281
3282 /**
3283  * Converts shorthand byte notation to integer form
3284  * @param $string String
3285  * @return Integer
3286  */
3287 function wfShorthandToInteger ( $string = '' ) {
3288         $string = trim($string);
3289         if( empty($string) ) { return -1; }
3290         $last = strtolower($string[strlen($string)-1]);
3291         $val = intval($string);
3292         switch($last) {
3293                 case 'g':
3294                         $val *= 1024;
3295                 case 'm':
3296                         $val *= 1024;
3297                 case 'k':
3298                         $val *= 1024;
3299         }
3300
3301         return $val;
3302 }
3303
3304 /* Get the normalised IETF language tag
3305  * @param $code String: The language code.
3306  * @return $langCode String: The language code which complying with BCP 47 standards.
3307  */
3308 function wfBCP47( $code ) {
3309         $codeSegment = explode( '-', $code );
3310         foreach ( $codeSegment as $segNo => $seg ) {
3311                 if ( count( $codeSegment ) > 0 ) {
3312                         // ISO 3166 country code
3313                         if ( ( strlen( $seg ) == 2 ) && ( $segNo > 0 ) )
3314                                 $codeBCP[$segNo] = strtoupper( $seg );
3315                         // ISO 15924 script code
3316                         else if ( ( strlen( $seg ) == 4 ) && ( $segNo > 0 ) )
3317                                 $codeBCP[$segNo] = ucfirst( $seg );
3318                         // Use lowercase for other cases
3319                         else
3320                                 $codeBCP[$segNo] = strtolower( $seg );
3321                 } else {
3322                 // Use lowercase for single segment
3323                         $codeBCP[$segNo] = strtolower( $seg );
3324                 }
3325         }
3326         $langCode = implode ( '-' , $codeBCP );
3327         return $langCode;
3328 }
3329
3330 function wfArrayMap( $function, $input ) {
3331         $ret = array_map( $function, $input );
3332         foreach ( $ret as $key => $value ) {
3333                 $taint = istainted( $input[$key] );
3334                 if ( $taint ) {
3335                         taint( $ret[$key], $taint );
3336                 }
3337         }
3338         return $ret;
3339 }