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 require_once dirname(__FILE__) . '/XmlFunctions.php';
  13
  14 // Hide compatibility functions from Doxygen
  15 /// @cond
  16
  17 /**
  18  * Compatibility functions
  19  *
  20  * We more or less support PHP 5.0.x and up.
  21  * Re-implementations of newer functions or functions in non-standard
  22  * PHP extensions may be included here.
  23  */
  24 if( !function_exists('iconv') ) {
  25         # iconv support is not in the default configuration and so may not be present.
  26         # Assume will only ever use utf-8 and iso-8859-1.
  27         # This will *not* work in all circumstances.
  28         function iconv( $from, $to, $string ) {
  29                 if(strcasecmp( $from, $to ) == 0) return $string;
  30                 if(strcasecmp( $from, 'utf-8' ) == 0) return utf8_decode( $string );
  31                 if(strcasecmp( $to, 'utf-8' ) == 0) return utf8_encode( $string );
  32                 return $string;
  33         }
  34 }
  35
  36 if ( !function_exists( 'mb_substr' ) ) {
  37         /**
  38          * Fallback implementation for mb_substr, hardcoded to UTF-8.
  39          * Attempts to be at least _moderately_ efficient; best optimized
  40          * for relatively small offset and count values -- about 5x slower
  41          * than native mb_string in my testing.
  42          *
  43          * Larger offsets are still fairly efficient for Latin text, but
  44          * can be up to 100x slower than native if the text is heavily
  45          * multibyte and we have to slog through a few hundred kb.
  46          */
  47         function mb_substr( $str, $start, $count='end' ) {
  48                 if( $start != 0 ) {
  49                         $split = mb_substr_split_unicode( $str, intval( $start ) );
  50                         $str = substr( $str, $split );
  51                 }
  52
  53                 if( $count !== 'end' ) {
  54                         $split = mb_substr_split_unicode( $str, intval( $count ) );
  55                         $str = substr( $str, 0, $split );
  56                 }
  57
  58                 return $str;
  59         }
  60
  61         function mb_substr_split_unicode( $str, $splitPos ) {
  62                 if( $splitPos == 0 ) {
  63                         return 0;
  64                 }
  65
  66                 $byteLen = strlen( $str );
  67
  68                 if( $splitPos > 0 ) {
  69                         if( $splitPos > 256 ) {
  70                                 // Optimize large string offsets by skipping ahead N bytes.
  71                                 // This will cut out most of our slow time on Latin-based text,
  72                                 // and 1/2 to 1/3 on East European and Asian scripts.
  73                                 $bytePos = $splitPos;
  74                                 while ($bytePos < $byteLen && $str{$bytePos} >= "\x80" && $str{$bytePos} < "\xc0")
  75                                         ++$bytePos;
  76                                 $charPos = mb_strlen( substr( $str, 0, $bytePos ) );
  77                         } else {
  78                                 $charPos = 0;
  79                                 $bytePos = 0;
  80                         }
  81
  82                         while( $charPos++ < $splitPos ) {
  83                                 ++$bytePos;
  84                                 // Move past any tail bytes
  85                                 while ($bytePos < $byteLen && $str{$bytePos} >= "\x80" && $str{$bytePos} < "\xc0")
  86                                         ++$bytePos;
  87                         }
  88                 } else {
  89                         $splitPosX = $splitPos + 1;
  90                         $charPos = 0; // relative to end of string; we don't care about the actual char position here
  91                         $bytePos = $byteLen;
  92                         while( $bytePos > 0 && $charPos-- >= $splitPosX ) {
  93                                 --$bytePos;
  94                                 // Move past any tail bytes
  95                                 while ($bytePos > 0 && $str{$bytePos} >= "\x80" && $str{$bytePos} < "\xc0")
  96                                         --$bytePos;
  97                         }
  98                 }
  99
 100                 return $bytePos;
 101         }
 102 }
 103
 104 if ( !function_exists( 'mb_strlen' ) ) {
 105         /**
 106          * Fallback implementation of mb_strlen, hardcoded to UTF-8.
 107          * @param string $str
 108          * @param string $enc optional encoding; ignored
 109          * @return int
 110          */
 111         function mb_strlen( $str, $enc="" ) {
 112                 $counts = count_chars( $str );
 113                 $total = 0;
 114
 115                 // Count ASCII bytes
 116                 for( $i = 0; $i < 0x80; $i++ ) {
 117                         $total += $counts[$i];
 118                 }
 119
 120                 // Count multibyte sequence heads
 121                 for( $i = 0xc0; $i < 0xff; $i++ ) {
 122                         $total += $counts[$i];
 123                 }
 124                 return $total;
 125         }
 126 }
 127
 128
 129 if( !function_exists( 'mb_strpos' ) ) {
 130         /**
 131          * Fallback implementation of mb_strpos, hardcoded to UTF-8.
 132          * @param $haystack String
 133          * @param $needle String
 134          * @param $offset String: optional start position
 135          * @param $encoding String: optional encoding; ignored
 136          * @return int
 137          */
 138         function mb_strpos( $haystack, $needle, $offset = 0, $encoding="" ) {
 139                 $needle = preg_quote( $needle, '/' );
 140
 141                 $ar = array();
 142                 preg_match( '/'.$needle.'/u', $haystack, $ar, PREG_OFFSET_CAPTURE, $offset );
 143
 144                 if( isset( $ar[0][1] ) ) {
 145                         return $ar[0][1];
 146                 } else {
 147                         return false;
 148                 }
 149         }
 150 }
 151
 152 if( !function_exists( 'mb_strrpos' ) ) {
 153         /**
 154          * Fallback implementation of mb_strrpos, hardcoded to UTF-8.
 155          * @param $haystack String
 156          * @param $needle String
 157          * @param $offset String: optional start position
 158          * @param $encoding String: optional encoding; ignored
 159          * @return int
 160          */
 161         function mb_strrpos( $haystack, $needle, $offset = 0, $encoding = "" ) {
 162                 $needle = preg_quote( $needle, '/' );
 163
 164                 $ar = array();
 165                 preg_match_all( '/'.$needle.'/u', $haystack, $ar, PREG_OFFSET_CAPTURE, $offset );
 166
 167                 if( isset( $ar[0] ) && count( $ar[0] ) > 0 &&
 168                     isset( $ar[0][count($ar[0])-1][1] ) ) {
 169                         return $ar[0][count($ar[0])-1][1];
 170                 } else {
 171                         return false;
 172                 }
 173         }
 174 }
 175
 176 if ( !function_exists( 'array_diff_key' ) ) {
 177         /**
 178          * Exists in PHP 5.1.0+
 179          * Not quite compatible, two-argument version only
 180          * Null values will cause problems due to this use of isset()
 181          */
 182         function array_diff_key( $left, $right ) {
 183                 $result = $left;
 184                 foreach ( $left as $key => $unused ) {
 185                         if ( isset( $right[$key] ) ) {
 186                                 unset( $result[$key] );
 187                         }
 188                 }
 189                 return $result;
 190         }
 191 }
 192
 193 // Support for Wietse Venema's taint feature
 194 if ( !function_exists( 'istainted' ) ) {
 195         function istainted( $var ) {
 196                 return 0;
 197         }
 198         function taint( $var, $level = 0 ) {}
 199         function untaint( $var, $level = 0 ) {}
 200         define( 'TC_HTML', 1 );
 201         define( 'TC_SHELL', 1 );
 202         define( 'TC_MYSQL', 1 );
 203         define( 'TC_PCRE', 1 );
 204         define( 'TC_SELF', 1 );
 205 }
 206 /// @endcond
 207
 208
 209 /**
 210  * Like array_diff( $a, $b ) except that it works with two-dimensional arrays.
 211  */
 212 function wfArrayDiff2( $a, $b ) {
 213         return array_udiff( $a, $b, 'wfArrayDiff2_cmp' );
 214 }
 215 function wfArrayDiff2_cmp( $a, $b ) {
 216         if ( !is_array( $a ) ) {
 217                 return strcmp( $a, $b );
 218         } elseif ( count( $a ) !== count( $b ) ) {
 219                 return count( $a ) < count( $b ) ? -1 : 1;
 220         } else {
 221                 reset( $a );
 222                 reset( $b );
 223                 while( ( list( $keyA, $valueA ) = each( $a ) ) && ( list( $keyB, $valueB ) = each( $b ) ) ) {
 224                         $cmp = strcmp( $valueA, $valueB );
 225                         if ( $cmp !== 0 ) {
 226                                 return $cmp;
 227                         }
 228                 }
 229                 return 0;
 230         }
 231 }
 232
 233 /**
 234  * Wrapper for clone(), for compatibility with PHP4-friendly extensions.
 235  * PHP 5 won't let you declare a 'clone' function, even conditionally,
 236  * so it has to be a wrapper with a different name.
 237  */
 238 function wfClone( $object ) {
 239         return clone( $object );
 240 }
 241
 242 /**
 243  * Seed Mersenne Twister
 244  * No-op for compatibility; only necessary in PHP < 4.2.0
 245  */
 246 function wfSeedRandom() {
 247         /* No-op */
 248 }
 249
 250 /**
 251  * Get a random decimal value between 0 and 1, in a way
 252  * not likely to give duplicate values for any realistic
 253  * number of articles.
 254  *
 255  * @return string
 256  */
 257 function wfRandom() {
 258         # The maximum random value is "only" 2^31-1, so get two random
 259         # values to reduce the chance of dupes
 260         $max = mt_getrandmax() + 1;
 261         $rand = number_format( (mt_rand() * $max + mt_rand())
 262                 / $max / $max, 12, '.', '' );
 263         return $rand;
 264 }
 265
 266 /**
 267  * We want some things to be included as literal characters in our title URLs
 268  * for prettiness, which urlencode encodes by default.  According to RFC 1738,
 269  * all of the following should be safe:
 270  *
 271  * ;:@&=$-_.+!*'(),
 272  *
 273  * But + is not safe because it's used to indicate a space; &= are only safe in
 274  * paths and not in queries (and we don't distinguish here); ' seems kind of
 275  * scary; and urlencode() doesn't touch -_. to begin with.  Plus, although /
 276  * is reserved, we don't care.  So the list we unescape is:
 277  *
 278  * ;:@$!*(),/
 279  *
 280  * %2F in the page titles seems to fatally break for some reason.
 281  *
 282  * @param $s String:
 283  * @return string
 284 */
 285 function wfUrlencode( $s ) {
 286         $s = urlencode( $s );
 287         $s = str_ireplace(
 288                 array( '%3B','%3A','%40','%24','%21','%2A','%28','%29','%2C','%2F' ),
 289                 array(   ';',  ':',  '@',  '$',  '!',  '*',  '(',  ')',  ',',  '/' ),
 290                 $s
 291         );
 292
 293         return $s;
 294 }
 295
 296 /**
 297  * Sends a line to the debug log if enabled or, optionally, to a comment in output.
 298  * In normal operation this is a NOP.
 299  *
 300  * Controlling globals:
 301  * $wgDebugLogFile - points to the log file
 302  * $wgProfileOnly - if set, normal debug messages will not be recorded.
 303  * $wgDebugRawPage - if false, 'action=raw' hits will not result in debug output.
 304  * $wgDebugComments - if on, some debug items may appear in comments in the HTML output.
 305  *
 306  * @param $text String
 307  * @param $logonly Bool: set true to avoid appearing in HTML when $wgDebugComments is set
 308  */
 309 function wfDebug( $text, $logonly = false ) {
 310         global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly, $wgDebugRawPage;
 311         global $wgDebugLogPrefix, $wgShowDebug;
 312         static $recursion = 0;
 313
 314         static $cache = array(); // Cache of unoutputted messages
 315
 316         # Check for raw action using $_GET not $wgRequest, since the latter might not be initialised yet
 317         if ( isset( $_GET['action'] ) && $_GET['action'] == 'raw' && !$wgDebugRawPage ) {
 318                 return;
 319         }
 320
 321         if ( ( $wgDebugComments || $wgShowDebug ) && !$logonly ) {
 322                 $cache[] = $text;
 323
 324                 if ( !isset( $wgOut ) ) {
 325                         return;
 326                 }
 327                 if ( !StubObject::isRealObject( $wgOut ) ) {
 328                         if ( $recursion ) {
 329                                 return;
 330                         }
 331                         $recursion++;
 332                         $wgOut->_unstub();
 333                         $recursion--;
 334                 }
 335
 336                 // add the message and possible cached ones to the output
 337                 array_map( array( $wgOut, 'debug' ), $cache );
 338                 $cache = array();
 339         }
 340         if ( $wgDebugLogFile != '' && !$wgProfileOnly ) {
 341                 # Strip unprintables; they can switch terminal modes when binary data
 342                 # gets dumped, which is pretty annoying.
 343                 $text = preg_replace( '![\x00-\x08\x0b\x0c\x0e-\x1f]!', ' ', $text );
 344                 $text = $wgDebugLogPrefix . $text;
 345                 wfErrorLog( $text, $wgDebugLogFile );
 346         }
 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( !isset( $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 over 70 messages in order to, e.g., fix a link in every
 604  * 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 $transform Boolean: Whether or not to transform the message.
 664  * @param $forContent Mixed: Language code, or false for user lang, true for content lang.
 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 ( $transform ) {
 706                         $message = $wgMessageCache->transform( $message );
 707                 }
 708         } else {
 709                 $lang = wfGetLangObj( $langCode );
 710
 711                 # MessageCache::get() does this already, Language::getMessage() doesn't
 712                 # ISSUE: Should we try to handle "message/lang" here too?
 713                 $key = str_replace( ' ' , '_' , $wgContLang->lcfirst( $key ) );
 714
 715                 if( is_object( $lang ) ) {
 716                         $message = $lang->getMessage( $key );
 717                 } else {
 718                         $message = false;
 719                 }
 720         }
 721
 722         return $message;
 723 }
 724
 725 /**
 726  * Replace message parameter keys on the given formatted output.
 727  *
 728  * @param $message String
 729  * @param $args Array
 730  * @return string
 731  * @private
 732  */
 733 function wfMsgReplaceArgs( $message, $args ) {
 734         # Fix windows line-endings
 735         # Some messages are split with explode("\n", $msg)
 736         $message = str_replace( "\r", '', $message );
 737
 738         // Replace arguments
 739         if ( count( $args ) ) {
 740                 if ( is_array( $args[0] ) ) {
 741                         $args = array_values( $args[0] );
 742                 }
 743                 $replacementKeys = array();
 744                 foreach( $args as $n => $param ) {
 745                         $replacementKeys['$' . ($n + 1)] = $param;
 746                 }
 747                 $message = strtr( $message, $replacementKeys );
 748         }
 749
 750         return $message;
 751 }
 752
 753 /**
 754  * Return an HTML-escaped version of a message.
 755  * Parameter replacements, if any, are done *after* the HTML-escaping,
 756  * so parameters may contain HTML (eg links or form controls). Be sure
 757  * to pre-escape them if you really do want plaintext, or just wrap
 758  * the whole thing in htmlspecialchars().
 759  *
 760  * @param $key String
 761  * @param string ... parameters
 762  * @return string
 763  */
 764 function wfMsgHtml( $key ) {
 765         $args = func_get_args();
 766         array_shift( $args );
 767         return wfMsgReplaceArgs( htmlspecialchars( wfMsgGetKey( $key, true ) ), $args );
 768 }
 769
 770 /**
 771  * Return an HTML version of message
 772  * Parameter replacements, if any, are done *after* parsing the wiki-text message,
 773  * so parameters may contain HTML (eg links or form controls). Be sure
 774  * to pre-escape them if you really do want plaintext, or just wrap
 775  * the whole thing in htmlspecialchars().
 776  *
 777  * @param $key String
 778  * @param string ... parameters
 779  * @return string
 780  */
 781 function wfMsgWikiHtml( $key ) {
 782         global $wgOut;
 783         $args = func_get_args();
 784         array_shift( $args );
 785         return wfMsgReplaceArgs( $wgOut->parse( wfMsgGetKey( $key, true ), /* can't be set to false */ true ), $args );
 786 }
 787
 788 /**
 789  * Returns message in the requested format
 790  * @param $key String: key of the message
 791  * @param $options Array: processing rules. Can take the following options:
 792  *   <i>parse</i>: parses wikitext to html
 793  *   <i>parseinline</i>: parses wikitext to html and removes the surrounding
 794  *       p's added by parser or tidy
 795  *   <i>escape</i>: filters message through htmlspecialchars
 796  *   <i>escapenoentities</i>: same, but allows entity references like &nbsp; through
 797  *   <i>replaceafter</i>: parameters are substituted after parsing or escaping
 798  *   <i>parsemag</i>: transform the message using magic phrases
 799  *   <i>content</i>: fetch message for content language instead of interface
 800  * Also can accept a single associative argument, of the form 'language' => 'xx':
 801  *   <i>language</i>: Language object or language code to fetch message for
 802  *       (overriden by <i>content</i>), its behaviour with parser, parseinline
 803  *       and parsemag is undefined.
 804  * Behavior for conflicting options (e.g., parse+parseinline) is undefined.
 805  */
 806 function wfMsgExt( $key, $options ) {
 807         global $wgOut;
 808
 809         $args = func_get_args();
 810         array_shift( $args );
 811         array_shift( $args );
 812         $options = (array)$options;
 813
 814         foreach( $options as $arrayKey => $option ) {
 815                 if( !preg_match( '/^[0-9]+|language$/', $arrayKey ) ) {
 816                         # An unknown index, neither numeric nor "language"
 817                         wfWarn( "wfMsgExt called with incorrect parameter key $arrayKey", 1, E_USER_WARNING );
 818                 } elseif( preg_match( '/^[0-9]+$/', $arrayKey ) && !in_array( $option,
 819                 array( 'parse', 'parseinline', 'escape', 'escapenoentities',
 820                 'replaceafter', 'parsemag', 'content' ) ) ) {
 821                         # A numeric index with unknown value
 822                         wfWarn( "wfMsgExt called with incorrect parameter $option", 1, E_USER_WARNING );
 823                 }
 824         }
 825
 826         if( in_array('content', $options, true ) ) {
 827                 $forContent = true;
 828                 $langCode = true;
 829         } elseif( array_key_exists('language', $options) ) {
 830                 $forContent = false;
 831                 $langCode = wfGetLangObj( $options['language'] );
 832         } else {
 833                 $forContent = false;
 834                 $langCode = false;
 835         }
 836
 837         $string = wfMsgGetKey( $key, /*DB*/true, $langCode, /*Transform*/false );
 838
 839         if( !in_array('replaceafter', $options, true ) ) {
 840                 $string = wfMsgReplaceArgs( $string, $args );
 841         }
 842
 843         if( in_array('parse', $options, true ) ) {
 844                 $string = $wgOut->parse( $string, true, !$forContent );
 845         } elseif ( in_array('parseinline', $options, true ) ) {
 846                 $string = $wgOut->parse( $string, true, !$forContent );
 847                 $m = array();
 848                 if( preg_match( '/^<p>(.*)\n?<\/p>\n?$/sU', $string, $m ) ) {
 849                         $string = $m[1];
 850                 }
 851         } elseif ( in_array('parsemag', $options, true ) ) {
 852                 global $wgMessageCache;
 853                 if ( isset( $wgMessageCache ) ) {
 854                         $string = $wgMessageCache->transform( $string,
 855                                 !$forContent,
 856                                 is_object( $langCode ) ? $langCode : null );
 857                 }
 858         }
 859
 860         if ( in_array('escape', $options, true ) ) {
 861                 $string = htmlspecialchars ( $string );
 862         } elseif ( in_array( 'escapenoentities', $options, true  ) ) {
 863                 $string = Sanitizer::escapeHtmlAllowEntities( $string );
 864         }
 865
 866         if( in_array('replaceafter', $options, true ) ) {
 867                 $string = wfMsgReplaceArgs( $string, $args );
 868         }
 869
 870         return $string;
 871 }
 872
 873
 874 /**
 875  * Just like exit() but makes a note of it.
 876  * Commits open transactions except if the error parameter is set
 877  *
 878  * @deprecated Please return control to the caller or throw an exception
 879  */
 880 function wfAbruptExit( $error = false ){
 881         static $called = false;
 882         if ( $called ){
 883                 exit( -1 );
 884         }
 885         $called = true;
 886
 887         $bt = wfDebugBacktrace();
 888         if( $bt ) {
 889                 for($i = 0; $i < count($bt) ; $i++){
 890                         $file = isset($bt[$i]['file']) ? $bt[$i]['file'] : "unknown";
 891                         $line = isset($bt[$i]['line']) ? $bt[$i]['line'] : "unknown";
 892                         wfDebug("WARNING: Abrupt exit in $file at line $line\n");
 893                 }
 894         } else {
 895                 wfDebug("WARNING: Abrupt exit\n");
 896         }
 897
 898         wfLogProfilingData();
 899
 900         if ( !$error ) {
 901                 wfGetLB()->closeAll();
 902         }
 903         exit( -1 );
 904 }
 905
 906 /**
 907  * @deprecated Please return control the caller or throw an exception
 908  */
 909 function wfErrorExit() {
 910         wfAbruptExit( true );
 911 }
 912
 913 /**
 914  * Print a simple message and die, returning nonzero to the shell if any.
 915  * Plain die() fails to return nonzero to the shell if you pass a string.
 916  * @param $msg String
 917  */
 918 function wfDie( $msg='' ) {
 919         echo $msg;
 920         die( 1 );
 921 }
 922
 923 /**
 924  * Throw a debugging exception. This function previously once exited the process,
 925  * but now throws an exception instead, with similar results.
 926  *
 927  * @param $msg String: message shown when dieing.
 928  */
 929 function wfDebugDieBacktrace( $msg = '' ) {
 930         throw new MWException( $msg );
 931 }
 932
 933 /**
 934  * Fetch server name for use in error reporting etc.
 935  * Use real server name if available, so we know which machine
 936  * in a server farm generated the current page.
 937  * @return string
 938  */
 939 function wfHostname() {
 940         static $host;
 941         if ( is_null( $host ) ) {
 942                 if ( function_exists( 'posix_uname' ) ) {
 943                         // This function not present on Windows
 944                         $uname = @posix_uname();
 945                 } else {
 946                         $uname = false;
 947                 }
 948                 if( is_array( $uname ) && isset( $uname['nodename'] ) ) {
 949                         $host = $uname['nodename'];
 950                 } elseif ( getenv( 'COMPUTERNAME' ) ) {
 951                         # Windows computer name
 952                         $host = getenv( 'COMPUTERNAME' );
 953                 } else {
 954                         # This may be a virtual server.
 955                         $host = $_SERVER['SERVER_NAME'];
 956                 }
 957         }
 958         return $host;
 959 }
 960
 961 /**
 962  * Returns a HTML comment with the elapsed time since request.
 963  * This method has no side effects.
 964  * @return string
 965  */
 966 function wfReportTime() {
 967         global $wgRequestTime, $wgShowHostnames;
 968
 969         $now = wfTime();
 970         $elapsed = $now - $wgRequestTime;
 971
 972         return $wgShowHostnames
 973                 ? sprintf( "<!-- Served by %s in %01.3f secs. -->", wfHostname(), $elapsed )
 974                 : sprintf( "<!-- Served in %01.3f secs. -->", $elapsed );
 975 }
 976
 977 /**
 978  * Safety wrapper for debug_backtrace().
 979  *
 980  * With Zend Optimizer 3.2.0 loaded, this causes segfaults under somewhat
 981  * murky circumstances, which may be triggered in part by stub objects
 982  * or other fancy talkin'.
 983  *
 984  * Will return an empty array if Zend Optimizer is detected or if
 985  * debug_backtrace is disabled, otherwise the output from
 986  * debug_backtrace() (trimmed).
 987  *
 988  * @return array of backtrace information
 989  */
 990 function wfDebugBacktrace() {
 991         static $disabled = null;
 992
 993         if( extension_loaded( 'Zend Optimizer' ) ) {
 994                 wfDebug( "Zend Optimizer detected; skipping debug_backtrace for safety.\n" );
 995                 return array();
 996         }
 997
 998         if ( is_null( $disabled ) ) {
 999                 $disabled = false;
1000                 $functions = explode( ',', ini_get( 'disable_functions' ) );
1001                 $functions = array_map( 'trim', $functions );
1002                 $functions = array_map( 'strtolower', $functions );
1003                 if ( in_array( 'debug_backtrace', $functions ) ) {
1004                         wfDebug( "debug_backtrace is in disabled_functions\n" );
1005                         $disabled = true;
1006                 }
1007         }
1008         if ( $disabled ) {
1009                 return array();
1010         }
1011
1012         return array_slice( debug_backtrace(), 1 );
1013 }
1014
1015 function wfBacktrace() {
1016         global $wgCommandLineMode;
1017
1018         if ( $wgCommandLineMode ) {
1019                 $msg = '';
1020         } else {
1021                 $msg = "<ul>\n";
1022         }
1023         $backtrace = wfDebugBacktrace();
1024         foreach( $backtrace as $call ) {
1025                 if( isset( $call['file'] ) ) {
1026                         $f = explode( DIRECTORY_SEPARATOR, $call['file'] );
1027                         $file = $f[count($f)-1];
1028                 } else {
1029                         $file = '-';
1030                 }
1031                 if( isset( $call['line'] ) ) {
1032                         $line = $call['line'];
1033                 } else {
1034                         $line = '-';
1035                 }
1036                 if ( $wgCommandLineMode ) {
1037                         $msg .= "$file line $line calls ";
1038                 } else {
1039                         $msg .= '<li>' . $file . ' line ' . $line . ' calls ';
1040                 }
1041                 if( !empty( $call['class'] ) ) $msg .= $call['class'] . '::';
1042                 $msg .= $call['function'] . '()';
1043
1044                 if ( $wgCommandLineMode ) {
1045                         $msg .= "\n";
1046                 } else {
1047                         $msg .= "</li>\n";
1048                 }
1049         }
1050         if ( $wgCommandLineMode ) {
1051                 $msg .= "\n";
1052         } else {
1053                 $msg .= "</ul>\n";
1054         }
1055
1056         return $msg;
1057 }
1058
1059
1060 /* Some generic result counters, pulled out of SearchEngine */
1061
1062
1063 /**
1064  * @todo document
1065  */
1066 function wfShowingResults( $offset, $limit ) {
1067         global $wgLang;
1068         return wfMsgExt( 'showingresults', array( 'parseinline' ), $wgLang->formatNum( $limit ),
1069                 $wgLang->formatNum( $offset+1 ) );
1070 }
1071
1072 /**
1073  * @todo document
1074  */
1075 function wfShowingResultsNum( $offset, $limit, $num ) {
1076         global $wgLang;
1077         return wfMsgExt( 'showingresultsnum', array( 'parseinline' ), $wgLang->formatNum( $limit ),
1078                 $wgLang->formatNum( $offset+1 ), $wgLang->formatNum( $num ) );
1079 }
1080
1081 /**
1082  * Generate (prev x| next x) (20|50|100...) type links for paging
1083  * @param $offset String
1084  * @param $limit Integer
1085  * @param $link String
1086  * @param $query String: optional URL query parameter string
1087  * @param $atend Bool: optional param for specified if this is the last page
1088  */
1089 function wfViewPrevNext( $offset, $limit, $link, $query = '', $atend = false ) {
1090         global $wgLang;
1091         $fmtLimit = $wgLang->formatNum( $limit );
1092         // FIXME: Why on earth this needs one message for the text and another one for tooltip??
1093         # Get prev/next link display text
1094         $prev =  wfMsgExt( 'prevn', array('parsemag','escape'), $fmtLimit );
1095         $next =  wfMsgExt( 'nextn', array('parsemag','escape'), $fmtLimit );
1096         # Get prev/next link title text
1097         $pTitle = wfMsgExt( 'prevn-title', array('parsemag','escape'), $fmtLimit );
1098         $nTitle = wfMsgExt( 'nextn-title', array('parsemag','escape'), $fmtLimit );
1099         # Fetch the title object
1100         if( is_object( $link ) ) {
1101                 $title =& $link;
1102         } else {
1103                 $title = Title::newFromText( $link );
1104                 if( is_null( $title ) ) {
1105                         return false;
1106                 }
1107         }
1108         # Make 'previous' link
1109         if( 0 != $offset ) {
1110                 $po = $offset - $limit;
1111                 $po = max($po,0);
1112                 $q = "limit={$limit}&offset={$po}";
1113                 if( $query != '' ) {
1114                         $q .= '&'.$query;
1115                 }
1116                 $plink = '<a href="' . $title->escapeLocalUrl( $q ) . "\" title=\"{$pTitle}\" class=\"mw-prevlink\">{$prev}</a>";
1117         } else {
1118                 $plink = $prev;
1119         }
1120         # Make 'next' link
1121         $no = $offset + $limit;
1122         $q = "limit={$limit}&offset={$no}";
1123         if( $query != '' ) {
1124                 $q .= '&'.$query;
1125         }
1126         if( $atend ) {
1127                 $nlink = $next;
1128         } else {
1129                 $nlink = '<a href="' . $title->escapeLocalUrl( $q ) . "\" title=\"{$nTitle}\" class=\"mw-nextlink\">{$next}</a>";
1130         }
1131         # Make links to set number of items per page
1132         $nums = $wgLang->pipeList( array(
1133                 wfNumLink( $offset, 20, $title, $query ),
1134                 wfNumLink( $offset, 50, $title, $query ),
1135                 wfNumLink( $offset, 100, $title, $query ),
1136                 wfNumLink( $offset, 250, $title, $query ),
1137                 wfNumLink( $offset, 500, $title, $query )
1138         ) );
1139         return wfMsgHtml( 'viewprevnext', $plink, $nlink, $nums );
1140 }
1141
1142 /**
1143  * Generate links for (20|50|100...) items-per-page links
1144  * @param $offset String
1145  * @param $limit Integer
1146  * @param $title Title
1147  * @param $query String: optional URL query parameter string
1148  */
1149 function wfNumLink( $offset, $limit, $title, $query = '' ) {
1150         global $wgLang;
1151         if( $query == '' ) {
1152                 $q = '';
1153         } else {
1154                 $q = $query.'&';
1155         }
1156         $q .= "limit={$limit}&offset={$offset}";
1157         $fmtLimit = $wgLang->formatNum( $limit );
1158         $lTitle = wfMsgExt('shown-title',array('parsemag','escape'),$limit);
1159         $s = '<a href="' . $title->escapeLocalUrl( $q ) . "\" title=\"{$lTitle}\" class=\"mw-numlink\">{$fmtLimit}</a>";
1160         return $s;
1161 }
1162
1163 /**
1164  * @todo document
1165  * @todo FIXME: we may want to blacklist some broken browsers
1166  *
1167  * @return bool Whereas client accept gzip compression
1168  */
1169 function wfClientAcceptsGzip() {
1170         if( isset( $_SERVER['HTTP_ACCEPT_ENCODING'] ) ) {
1171                 # FIXME: we may want to blacklist some broken browsers
1172                 $m = array();
1173                 if( preg_match(
1174                         '/\bgzip(?:;(q)=([0-9]+(?:\.[0-9]+)))?\b/',
1175                         $_SERVER['HTTP_ACCEPT_ENCODING'],
1176                         $m ) ) {
1177                         if( isset( $m[2] ) && ( $m[1] == 'q' ) && ( $m[2] == 0 ) ) return false;
1178                         wfDebug( " accepts gzip\n" );
1179                         return true;
1180                 }
1181         }
1182         return false;
1183 }
1184
1185 /**
1186  * Obtain the offset and limit values from the request string;
1187  * used in special pages
1188  *
1189  * @param $deflimit Default limit if none supplied
1190  * @param $optionname Name of a user preference to check against
1191  * @return array
1192  *
1193  */
1194 function wfCheckLimits( $deflimit = 50, $optionname = 'rclimit' ) {
1195         global $wgRequest;
1196         return $wgRequest->getLimitOffset( $deflimit, $optionname );
1197 }
1198
1199 /**
1200  * Escapes the given text so that it may be output using addWikiText()
1201  * without any linking, formatting, etc. making its way through. This
1202  * is achieved by substituting certain characters with HTML entities.
1203  * As required by the callers, <nowiki> is not used. It currently does
1204  * not filter out characters which have special meaning only at the
1205  * start of a line, such as "*".
1206  *
1207  * @param $text String: text to be escaped
1208  */
1209 function wfEscapeWikiText( $text ) {
1210         $text = str_replace(
1211                 array( '[',     '|',      ']',     '\'',    'ISBN ',     'RFC ',     '://',     "\n=",     '{{' ), # }}
1212                 array( '&#91;', '&#124;', '&#93;', '&#39;', 'ISBN&#32;', 'RFC&#32;', '&#58;//', "\n&#61;", '&#123;&#123;' ),
1213                 htmlspecialchars($text) );
1214         return $text;
1215 }
1216
1217 /**
1218  * @todo document
1219  */
1220 function wfQuotedPrintable( $string, $charset = '' ) {
1221         # Probably incomplete; see RFC 2045
1222         if( empty( $charset ) ) {
1223                 global $wgInputEncoding;
1224                 $charset = $wgInputEncoding;
1225         }
1226         $charset = strtoupper( $charset );
1227         $charset = str_replace( 'ISO-8859', 'ISO8859', $charset ); // ?
1228
1229         $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
1230         $replace = $illegal . '\t ?_';
1231         if( !preg_match( "/[$illegal]/", $string ) ) return $string;
1232         $out = "=?$charset?Q?";
1233         $out .= preg_replace( "/([$replace])/e", 'sprintf("=%02X",ord("$1"))', $string );
1234         $out .= '?=';
1235         return $out;
1236 }
1237
1238
1239 /**
1240  * @todo document
1241  * @return float
1242  */
1243 function wfTime() {
1244         return microtime(true);
1245 }
1246
1247 /**
1248  * Sets dest to source and returns the original value of dest
1249  * If source is NULL, it just returns the value, it doesn't set the variable
1250  */
1251 function wfSetVar( &$dest, $source ) {
1252         $temp = $dest;
1253         if ( !is_null( $source ) ) {
1254                 $dest = $source;
1255         }
1256         return $temp;
1257 }
1258
1259 /**
1260  * As for wfSetVar except setting a bit
1261  */
1262 function wfSetBit( &$dest, $bit, $state = true ) {
1263         $temp = (bool)($dest & $bit );
1264         if ( !is_null( $state ) ) {
1265                 if ( $state ) {
1266                         $dest |= $bit;
1267                 } else {
1268                         $dest &= ~$bit;
1269                 }
1270         }
1271         return $temp;
1272 }
1273
1274 /**
1275  * This function takes two arrays as input, and returns a CGI-style string, e.g.
1276  * "days=7&limit=100". Options in the first array override options in the second.
1277  * Options set to "" will not be output.
1278  */
1279 function wfArrayToCGI( $array1, $array2 = null )
1280 {
1281         if ( !is_null( $array2 ) ) {
1282                 $array1 = $array1 + $array2;
1283         }
1284
1285         $cgi = '';
1286         foreach ( $array1 as $key => $value ) {
1287                 if ( $value !== '' ) {
1288                         if ( $cgi != '' ) {
1289                                 $cgi .= '&';
1290                         }
1291                         if ( is_array( $value ) ) {
1292                                 $firstTime = true;
1293                                 foreach ( $value as $v ) {
1294                                         $cgi .= ( $firstTime ? '' : '&') .
1295                                                 urlencode( $key . '[]' ) . '=' .
1296                                                 urlencode( $v );
1297                                         $firstTime = false;
1298                                 }
1299                         } else {
1300                                 if ( is_object( $value ) ) {
1301                                         $value = $value->__toString();
1302                                 }
1303                                 $cgi .= urlencode( $key ) . '=' .
1304                                         urlencode( $value );
1305                         }
1306                 }
1307         }
1308         return $cgi;
1309 }
1310
1311 /**
1312  * This is the logical opposite of wfArrayToCGI(): it accepts a query string as
1313  * its argument and returns the same string in array form.  This allows compa-
1314  * tibility with legacy functions that accept raw query strings instead of nice
1315  * arrays.  Of course, keys and values are urldecode()d.  Don't try passing in-
1316  * valid query strings, or it will explode.
1317  *
1318  * @param $query String: query string
1319  * @return array Array version of input
1320  */
1321 function wfCgiToArray( $query ) {
1322         if( isset( $query[0] ) and $query[0] == '?' ) {
1323                 $query = substr( $query, 1 );
1324         }
1325         $bits = explode( '&', $query );
1326         $ret = array();
1327         foreach( $bits as $bit ) {
1328                 if( $bit === '' ) {
1329                         continue;
1330                 }
1331                 list( $key, $value ) = explode( '=', $bit );
1332                 $key = urldecode( $key );
1333                 $value = urldecode( $value );
1334                 $ret[$key] = $value;
1335         }
1336         return $ret;
1337 }
1338
1339 /**
1340  * Append a query string to an existing URL, which may or may not already
1341  * have query string parameters already. If so, they will be combined.
1342  *
1343  * @param $url String
1344  * @param $query Mixed: string or associative array
1345  * @return string
1346  */
1347 function wfAppendQuery( $url, $query ) {
1348         if ( is_array( $query ) ) {
1349                 $query = wfArrayToCGI( $query );
1350         }
1351         if( $query != '' ) {
1352                 if( false === strpos( $url, '?' ) ) {
1353                         $url .= '?';
1354                 } else {
1355                         $url .= '&';
1356                 }
1357                 $url .= $query;
1358         }
1359         return $url;
1360 }
1361
1362 /**
1363  * Expand a potentially local URL to a fully-qualified URL.  Assumes $wgServer
1364  * is correct.  Also doesn't handle any type of relative URL except one
1365  * starting with a single "/": this won't work with current-path-relative URLs
1366  * like "subdir/foo.html", protocol-relative URLs like
1367  * "//en.wikipedia.org/wiki/", etc.  TODO: improve this!
1368  *
1369  * @param $url String: either fully-qualified or a local path + query
1370  * @return string Fully-qualified URL
1371  */
1372 function wfExpandUrl( $url ) {
1373         if( substr( $url, 0, 1 ) == '/' ) {
1374                 global $wgServer;
1375                 return $wgServer . $url;
1376         } else {
1377                 return $url;
1378         }
1379 }
1380
1381 /**
1382  * This is obsolete, use SquidUpdate::purge()
1383  * @deprecated
1384  */
1385 function wfPurgeSquidServers ($urlArr) {
1386         SquidUpdate::purge( $urlArr );
1387 }
1388
1389 /**
1390  * Windows-compatible version of escapeshellarg()
1391  * Windows doesn't recognise single-quotes in the shell, but the escapeshellarg()
1392  * function puts single quotes in regardless of OS.
1393  *
1394  * Also fixes the locale problems on Linux in PHP 5.2.6+ (bug backported to
1395  * earlier distro releases of PHP)
1396  */
1397 function wfEscapeShellArg( ) {
1398         wfInitShellLocale();
1399
1400         $args = func_get_args();
1401         $first = true;
1402         $retVal = '';
1403         foreach ( $args as $arg ) {
1404                 if ( !$first ) {
1405                         $retVal .= ' ';
1406                 } else {
1407                         $first = false;
1408                 }
1409
1410                 if ( wfIsWindows() ) {
1411                         // Escaping for an MSVC-style command line parser
1412                         // Ref: http://mailman.lyra.org/pipermail/scite-interest/2002-March/000436.html
1413                         // Double the backslashes before any double quotes. Escape the double quotes.
1414                         $tokens = preg_split( '/(\\\\*")/', $arg, -1, PREG_SPLIT_DELIM_CAPTURE );
1415                         $arg = '';
1416                         $delim = false;
1417                         foreach ( $tokens as $token ) {
1418                                 if ( $delim ) {
1419                                         $arg .= str_replace( '\\', '\\\\', substr( $token, 0, -1 ) ) . '\\"';
1420                                 } else {
1421                                         $arg .= $token;
1422                                 }
1423                                 $delim = !$delim;
1424                         }
1425                         // Double the backslashes before the end of the string, because
1426                         // we will soon add a quote
1427                         $m = array();
1428                         if ( preg_match( '/^(.*?)(\\\\+)$/', $arg, $m ) ) {
1429                                 $arg = $m[1] . str_replace( '\\', '\\\\', $m[2] );
1430                         }
1431
1432                         // Add surrounding quotes
1433                         $retVal .= '"' . $arg . '"';
1434                 } else {
1435                         $retVal .= escapeshellarg( $arg );
1436                 }
1437         }
1438         return $retVal;
1439 }
1440
1441 /**
1442  * wfMerge attempts to merge differences between three texts.
1443  * Returns true for a clean merge and false for failure or a conflict.
1444  */
1445 function wfMerge( $old, $mine, $yours, &$result ){
1446         global $wgDiff3;
1447
1448         # This check may also protect against code injection in
1449         # case of broken installations.
1450         if( !$wgDiff3 || !file_exists( $wgDiff3 ) ) {
1451                 wfDebug( "diff3 not found\n" );
1452                 return false;
1453         }
1454
1455         # Make temporary files
1456         $td = wfTempDir();
1457         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
1458         $mytextFile = fopen( $mytextName = tempnam( $td, 'merge-mine-' ), 'w' );
1459         $yourtextFile = fopen( $yourtextName = tempnam( $td, 'merge-your-' ), 'w' );
1460
1461         fwrite( $oldtextFile, $old ); fclose( $oldtextFile );
1462         fwrite( $mytextFile, $mine ); fclose( $mytextFile );
1463         fwrite( $yourtextFile, $yours ); fclose( $yourtextFile );
1464
1465         # Check for a conflict
1466         $cmd = $wgDiff3 . ' -a --overlap-only ' .
1467           wfEscapeShellArg( $mytextName ) . ' ' .
1468           wfEscapeShellArg( $oldtextName ) . ' ' .
1469           wfEscapeShellArg( $yourtextName );
1470         $handle = popen( $cmd, 'r' );
1471
1472         if( fgets( $handle, 1024 ) ){
1473                 $conflict = true;
1474         } else {
1475                 $conflict = false;
1476         }
1477         pclose( $handle );
1478
1479         # Merge differences
1480         $cmd = $wgDiff3 . ' -a -e --merge ' .
1481           wfEscapeShellArg( $mytextName, $oldtextName, $yourtextName );
1482         $handle = popen( $cmd, 'r' );
1483         $result = '';
1484         do {
1485                 $data = fread( $handle, 8192 );
1486                 if ( strlen( $data ) == 0 ) {
1487                         break;
1488                 }
1489                 $result .= $data;
1490         } while ( true );
1491         pclose( $handle );
1492         unlink( $mytextName ); unlink( $oldtextName ); unlink( $yourtextName );
1493
1494         if ( $result === '' && $old !== '' && $conflict == false ) {
1495                 wfDebug( "Unexpected null result from diff3. Command: $cmd\n" );
1496                 $conflict = true;
1497         }
1498         return ! $conflict;
1499 }
1500
1501 /**
1502  * Returns unified plain-text diff of two texts.
1503  * Useful for machine processing of diffs.
1504  * @param $before String: the text before the changes.
1505  * @param $after String: the text after the changes.
1506  * @param $params String: command-line options for the diff command.
1507  * @return String: unified diff of $before and $after
1508  */
1509 function wfDiff( $before, $after, $params = '-u' ) {
1510         if ($before == $after) {
1511                 return '';
1512         }
1513
1514         global $wgDiff;
1515
1516         # This check may also protect against code injection in
1517         # case of broken installations.
1518         if( !file_exists( $wgDiff ) ){
1519                 wfDebug( "diff executable not found\n" );
1520                 $diffs = new Diff( explode( "\n", $before ), explode( "\n", $after ) );
1521                 $format = new UnifiedDiffFormatter();
1522                 return $format->format( $diffs );
1523         }
1524
1525         # Make temporary files
1526         $td = wfTempDir();
1527         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
1528         $newtextFile = fopen( $newtextName = tempnam( $td, 'merge-your-' ), 'w' );
1529
1530         fwrite( $oldtextFile, $before ); fclose( $oldtextFile );
1531         fwrite( $newtextFile, $after ); fclose( $newtextFile );
1532
1533         // Get the diff of the two files
1534         $cmd = "$wgDiff " . $params . ' ' .wfEscapeShellArg( $oldtextName, $newtextName );
1535
1536         $h = popen( $cmd, 'r' );
1537
1538         $diff = '';
1539
1540         do {
1541                 $data = fread( $h, 8192 );
1542                 if ( strlen( $data ) == 0 ) {
1543                         break;
1544                 }
1545                 $diff .= $data;
1546         } while ( true );
1547
1548         // Clean up
1549         pclose( $h );
1550         unlink( $oldtextName );
1551         unlink( $newtextName );
1552
1553         // Kill the --- and +++ lines. They're not useful.
1554         $diff_lines = explode( "\n", $diff );
1555         if (strpos( $diff_lines[0], '---' ) === 0) {
1556                 unset($diff_lines[0]);
1557         }
1558         if (strpos( $diff_lines[1], '+++' ) === 0) {
1559                 unset($diff_lines[1]);
1560         }
1561
1562         $diff = implode( "\n", $diff_lines );
1563
1564         return $diff;
1565 }
1566
1567 /**
1568  * A wrapper around the PHP function var_export().
1569  * Either print it or add it to the regular output ($wgOut).
1570  *
1571  * @param $var A PHP variable to dump.
1572  */
1573 function wfVarDump( $var ) {
1574         global $wgOut;
1575         $s = str_replace("\n","<br />\n", var_export( $var, true ) . "\n");
1576         if ( headers_sent() || !@is_object( $wgOut ) ) {
1577                 print $s;
1578         } else {
1579                 $wgOut->addHTML( $s );
1580         }
1581 }
1582
1583 /**
1584  * Provide a simple HTTP error.
1585  */
1586 function wfHttpError( $code, $label, $desc ) {
1587         global $wgOut;
1588         $wgOut->disable();
1589         header( "HTTP/1.0 $code $label" );
1590         header( "Status: $code $label" );
1591         $wgOut->sendCacheControl();
1592
1593         header( 'Content-type: text/html; charset=utf-8' );
1594         print "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">".
1595                 "<html><head><title>" .
1596                 htmlspecialchars( $label ) .
1597                 "</title></head><body><h1>" .
1598                 htmlspecialchars( $label ) .
1599                 "</h1><p>" .
1600                 nl2br( htmlspecialchars( $desc ) ) .
1601                 "</p></body></html>\n";
1602 }
1603
1604 /**
1605  * Clear away any user-level output buffers, discarding contents.
1606  *
1607  * Suitable for 'starting afresh', for instance when streaming
1608  * relatively large amounts of data without buffering, or wanting to
1609  * output image files without ob_gzhandler's compression.
1610  *
1611  * The optional $resetGzipEncoding parameter controls suppression of
1612  * the Content-Encoding header sent by ob_gzhandler; by default it
1613  * is left. See comments for wfClearOutputBuffers() for why it would
1614  * be used.
1615  *
1616  * Note that some PHP configuration options may add output buffer
1617  * layers which cannot be removed; these are left in place.
1618  *
1619  * @param $resetGzipEncoding Bool
1620  */
1621 function wfResetOutputBuffers( $resetGzipEncoding=true ) {
1622         if( $resetGzipEncoding ) {
1623                 // Suppress Content-Encoding and Content-Length
1624                 // headers from 1.10+s wfOutputHandler
1625                 global $wgDisableOutputCompression;
1626                 $wgDisableOutputCompression = true;
1627         }
1628         while( $status = ob_get_status() ) {
1629                 if( $status['type'] == 0 /* PHP_OUTPUT_HANDLER_INTERNAL */ ) {
1630                         // Probably from zlib.output_compression or other
1631                         // PHP-internal setting which can't be removed.
1632                         //
1633                         // Give up, and hope the result doesn't break
1634                         // output behavior.
1635                         break;
1636                 }
1637                 if( !ob_end_clean() ) {
1638                         // Could not remove output buffer handler; abort now
1639                         // to avoid getting in some kind of infinite loop.
1640                         break;
1641                 }
1642                 if( $resetGzipEncoding ) {
1643                         if( $status['name'] == 'ob_gzhandler' ) {
1644                                 // Reset the 'Content-Encoding' field set by this handler
1645                                 // so we can start fresh.
1646                                 header( 'Content-Encoding:' );
1647                                 break;
1648                         }
1649                 }
1650         }
1651 }
1652
1653 /**
1654  * More legible than passing a 'false' parameter to wfResetOutputBuffers():
1655  *
1656  * Clear away output buffers, but keep the Content-Encoding header
1657  * produced by ob_gzhandler, if any.
1658  *
1659  * This should be used for HTTP 304 responses, where you need to
1660  * preserve the Content-Encoding header of the real result, but
1661  * also need to suppress the output of ob_gzhandler to keep to spec
1662  * and avoid breaking Firefox in rare cases where the headers and
1663  * body are broken over two packets.
1664  */
1665 function wfClearOutputBuffers() {
1666         wfResetOutputBuffers( false );
1667 }
1668
1669 /**
1670  * Converts an Accept-* header into an array mapping string values to quality
1671  * factors
1672  */
1673 function wfAcceptToPrefs( $accept, $def = '*/*' ) {
1674         # No arg means accept anything (per HTTP spec)
1675         if( !$accept ) {
1676                 return array( $def => 1.0 );
1677         }
1678
1679         $prefs = array();
1680
1681         $parts = explode( ',', $accept );
1682
1683         foreach( $parts as $part ) {
1684                 # FIXME: doesn't deal with params like 'text/html; level=1'
1685                 @list( $value, $qpart ) = explode( ';', trim( $part ) );
1686                 $match = array();
1687                 if( !isset( $qpart ) ) {
1688                         $prefs[$value] = 1.0;
1689                 } elseif( preg_match( '/q\s*=\s*(\d*\.\d+)/', $qpart, $match ) ) {
1690                         $prefs[$value] = floatval($match[1]);
1691                 }
1692         }
1693
1694         return $prefs;
1695 }
1696
1697 /**
1698  * Checks if a given MIME type matches any of the keys in the given
1699  * array. Basic wildcards are accepted in the array keys.
1700  *
1701  * Returns the matching MIME type (or wildcard) if a match, otherwise
1702  * NULL if no match.
1703  *
1704  * @param $type String
1705  * @param $avail Array
1706  * @return string
1707  * @private
1708  */
1709 function mimeTypeMatch( $type, $avail ) {
1710         if( array_key_exists($type, $avail) ) {
1711                 return $type;
1712         } else {
1713                 $parts = explode( '/', $type );
1714                 if( array_key_exists( $parts[0] . '/*', $avail ) ) {
1715                         return $parts[0] . '/*';
1716                 } elseif( array_key_exists( '*/*', $avail ) ) {
1717                         return '*/*';
1718                 } else {
1719                         return null;
1720                 }
1721         }
1722 }
1723
1724 /**
1725  * Returns the 'best' match between a client's requested internet media types
1726  * and the server's list of available types. Each list should be an associative
1727  * array of type to preference (preference is a float between 0.0 and 1.0).
1728  * Wildcards in the types are acceptable.
1729  *
1730  * @param $cprefs Array: client's acceptable type list
1731  * @param $sprefs Array: server's offered types
1732  * @return string
1733  *
1734  * @todo FIXME: doesn't handle params like 'text/plain; charset=UTF-8'
1735  * XXX: generalize to negotiate other stuff
1736  */
1737 function wfNegotiateType( $cprefs, $sprefs ) {
1738         $combine = array();
1739
1740         foreach( array_keys($sprefs) as $type ) {
1741                 $parts = explode( '/', $type );
1742                 if( $parts[1] != '*' ) {
1743                         $ckey = mimeTypeMatch( $type, $cprefs );
1744                         if( $ckey ) {
1745                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
1746                         }
1747                 }
1748         }
1749
1750         foreach( array_keys( $cprefs ) as $type ) {
1751                 $parts = explode( '/', $type );
1752                 if( $parts[1] != '*' && !array_key_exists( $type, $sprefs ) ) {
1753                         $skey = mimeTypeMatch( $type, $sprefs );
1754                         if( $skey ) {
1755                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
1756                         }
1757                 }
1758         }
1759
1760         $bestq = 0;
1761         $besttype = null;
1762
1763         foreach( array_keys( $combine ) as $type ) {
1764                 if( $combine[$type] > $bestq ) {
1765                         $besttype = $type;
1766                         $bestq = $combine[$type];
1767                 }
1768         }
1769
1770         return $besttype;
1771 }
1772
1773 /**
1774  * Array lookup
1775  * Returns an array where the values in the first array are replaced by the
1776  * values in the second array with the corresponding keys
1777  *
1778  * @return array
1779  */
1780 function wfArrayLookup( $a, $b ) {
1781         return array_flip( array_intersect( array_flip( $a ), array_keys( $b ) ) );
1782 }
1783
1784 /**
1785  * Convenience function; returns MediaWiki timestamp for the present time.
1786  * @return string
1787  */
1788 function wfTimestampNow() {
1789         # return NOW
1790         return wfTimestamp( TS_MW, time() );
1791 }
1792
1793 /**
1794  * Reference-counted warning suppression
1795  */
1796 function wfSuppressWarnings( $end = false ) {
1797         static $suppressCount = 0;
1798         static $originalLevel = false;
1799
1800         if ( $end ) {
1801                 if ( $suppressCount ) {
1802                         --$suppressCount;
1803                         if ( !$suppressCount ) {
1804                                 error_reporting( $originalLevel );
1805                         }
1806                 }
1807         } else {
1808                 if ( !$suppressCount ) {
1809                         $originalLevel = error_reporting( E_ALL & ~( E_WARNING | E_NOTICE ) );
1810                 }
1811                 ++$suppressCount;
1812         }
1813 }
1814
1815 /**
1816  * Restore error level to previous value
1817  */
1818 function wfRestoreWarnings() {
1819         wfSuppressWarnings( true );
1820 }
1821
1822 # Autodetect, convert and provide timestamps of various types
1823
1824 /**
1825  * Unix time - the number of seconds since 1970-01-01 00:00:00 UTC
1826  */
1827 define('TS_UNIX', 0);
1828
1829 /**
1830  * MediaWiki concatenated string timestamp (YYYYMMDDHHMMSS)
1831  */
1832 define('TS_MW', 1);
1833
1834 /**
1835  * MySQL DATETIME (YYYY-MM-DD HH:MM:SS)
1836  */
1837 define('TS_DB', 2);
1838
1839 /**
1840  * RFC 2822 format, for E-mail and HTTP headers
1841  */
1842 define('TS_RFC2822', 3);
1843
1844 /**
1845  * ISO 8601 format with no timezone: 1986-02-09T20:00:00Z
1846  *
1847  * This is used by Special:Export
1848  */
1849 define('TS_ISO_8601', 4);
1850
1851 /**
1852  * An Exif timestamp (YYYY:MM:DD HH:MM:SS)
1853  *
1854  * @see http://exif.org/Exif2-2.PDF The Exif 2.2 spec, see page 28 for the
1855  *       DateTime tag and page 36 for the DateTimeOriginal and
1856  *       DateTimeDigitized tags.
1857  */
1858 define('TS_EXIF', 5);
1859
1860 /**
1861  * Oracle format time.
1862  */
1863 define('TS_ORACLE', 6);
1864
1865 /**
1866  * Postgres format time.
1867  */
1868 define('TS_POSTGRES', 7);
1869
1870 /**
1871  * DB2 format time
1872  */
1873 define('TS_DB2', 8);
1874
1875 /**
1876  * @param $outputtype Mixed: A timestamp in one of the supported formats, the
1877  *                    function will autodetect which format is supplied and act
1878  *                    accordingly.
1879  * @param $ts Mixed: the timestamp to convert or 0 for the current timestamp
1880  * @return String: in the format specified in $outputtype
1881  */
1882 function wfTimestamp( $outputtype = TS_UNIX, $ts = 0 ) {
1883         $uts = 0;
1884         $da = array();
1885         if ($ts==0) {
1886                 $uts=time();
1887         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/D',$ts,$da)) {
1888                 # TS_DB
1889         } elseif (preg_match('/^(\d{4}):(\d\d):(\d\d) (\d\d):(\d\d):(\d\d)$/D',$ts,$da)) {
1890                 # TS_EXIF
1891         } elseif (preg_match('/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/D',$ts,$da)) {
1892                 # TS_MW
1893         } elseif (preg_match('/^\d{1,13}$/D',$ts)) {
1894                 # TS_UNIX
1895                 $uts = $ts;
1896         } elseif (preg_match('/^\d{2}-\d{2}-\d{4} \d{2}:\d{2}:\d{2}.\d{6}$/', $ts)) {
1897                 # TS_ORACLE // session altered to DD-MM-YYYY HH24:MI:SS.FF6
1898                 $uts = strtotime(preg_replace('/(\d\d)\.(\d\d)\.(\d\d)(\.(\d+))?/', "$1:$2:$3",
1899                                 str_replace("+00:00", "UTC", $ts)));
1900         } elseif (preg_match('/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.*\d*)?Z$/', $ts, $da)) {
1901                 # TS_ISO_8601
1902         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.*\d*[\+\- ](\d\d)$/',$ts,$da)) {
1903                 # TS_POSTGRES
1904         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)\.*\d* GMT$/',$ts,$da)) {
1905                 # TS_POSTGRES
1906         } else {
1907                 # Bogus value; fall back to the epoch...
1908                 wfDebug("wfTimestamp() fed bogus time value: $outputtype; $ts\n");
1909                 $uts = 0;
1910         }
1911
1912         if (count( $da ) ) {
1913                 // Warning! gmmktime() acts oddly if the month or day is set to 0
1914                 // We may want to handle that explicitly at some point
1915                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1916                         (int)$da[2],(int)$da[3],(int)$da[1]);
1917         }
1918
1919         switch($outputtype) {
1920                 case TS_UNIX:
1921                         return $uts;
1922                 case TS_MW:
1923                         return gmdate( 'YmdHis', $uts );
1924                 case TS_DB:
1925                         return gmdate( 'Y-m-d H:i:s', $uts );
1926                 case TS_ISO_8601:
1927                         return gmdate( 'Y-m-d\TH:i:s\Z', $uts );
1928                 // This shouldn't ever be used, but is included for completeness
1929                 case TS_EXIF:
1930                         return gmdate(  'Y:m:d H:i:s', $uts );
1931                 case TS_RFC2822:
1932                         return gmdate( 'D, d M Y H:i:s', $uts ) . ' GMT';
1933                 case TS_ORACLE:
1934                         return gmdate( 'd-m-Y H:i:s.000000', $uts);
1935                         //return gmdate( 'd-M-y h.i.s A', $uts) . ' +00:00';
1936                 case TS_POSTGRES:
1937                         return gmdate( 'Y-m-d H:i:s', $uts) . ' GMT';
1938                 case TS_DB2:
1939                         return gmdate( 'Y-m-d H:i:s', $uts);
1940                 default:
1941                         throw new MWException( 'wfTimestamp() called with illegal output type.');
1942         }
1943 }
1944
1945 /**
1946  * Return a formatted timestamp, or null if input is null.
1947  * For dealing with nullable timestamp columns in the database.
1948  * @param $outputtype Integer
1949  * @param $ts String
1950  * @return String
1951  */
1952 function wfTimestampOrNull( $outputtype = TS_UNIX, $ts = null ) {
1953         if( is_null( $ts ) ) {
1954                 return null;
1955         } else {
1956                 return wfTimestamp( $outputtype, $ts );
1957         }
1958 }
1959
1960 /**
1961  * Check if the operating system is Windows
1962  *
1963  * @return Bool: true if it's Windows, False otherwise.
1964  */
1965 function wfIsWindows() {
1966         if (substr(php_uname(), 0, 7) == 'Windows') {
1967                 return true;
1968         } else {
1969                 return false;
1970         }
1971 }
1972
1973 /**
1974  * Swap two variables
1975  */
1976 function swap( &$x, &$y ) {
1977         $z = $x;
1978         $x = $y;
1979         $y = $z;
1980 }
1981
1982 function wfGetCachedNotice( $name ) {
1983         global $wgOut, $wgRenderHashAppend, $parserMemc;
1984         $fname = 'wfGetCachedNotice';
1985         wfProfileIn( $fname );
1986
1987         $needParse = false;
1988
1989         if( $name === 'default' ) {
1990                 // special case
1991                 global $wgSiteNotice;
1992                 $notice = $wgSiteNotice;
1993                 if( empty( $notice ) ) {
1994                         wfProfileOut( $fname );
1995                         return false;
1996                 }
1997         } else {
1998                 $notice = wfMsgForContentNoTrans( $name );
1999                 if( wfEmptyMsg( $name, $notice ) || $notice == '-' ) {
2000                         wfProfileOut( $fname );
2001                         return( false );
2002                 }
2003         }
2004
2005         // Use the extra hash appender to let eg SSL variants separately cache.
2006         $key = wfMemcKey( $name . $wgRenderHashAppend );
2007         $cachedNotice = $parserMemc->get( $key );
2008         if( is_array( $cachedNotice ) ) {
2009                 if( md5( $notice ) == $cachedNotice['hash'] ) {
2010                         $notice = $cachedNotice['html'];
2011                 } else {
2012                         $needParse = true;
2013                 }
2014         } else {
2015                 $needParse = true;
2016         }
2017
2018         if( $needParse ) {
2019                 if( is_object( $wgOut ) ) {
2020                         $parsed = $wgOut->parse( $notice );
2021                         $parserMemc->set( $key, array( 'html' => $parsed, 'hash' => md5( $notice ) ), 600 );
2022                         $notice = $parsed;
2023                 } else {
2024                         wfDebug( 'wfGetCachedNotice called for ' . $name . ' with no $wgOut available'."\n" );
2025                         $notice = '';
2026                 }
2027         }
2028
2029         wfProfileOut( $fname );
2030         return $notice;
2031 }
2032
2033 function wfGetNamespaceNotice() {
2034         global $wgTitle;
2035
2036         # Paranoia
2037         if ( !isset( $wgTitle ) || !is_object( $wgTitle ) )
2038                 return "";
2039
2040         $fname = 'wfGetNamespaceNotice';
2041         wfProfileIn( $fname );
2042
2043         $key = "namespacenotice-" . $wgTitle->getNsText();
2044         $namespaceNotice = wfGetCachedNotice( $key );
2045         if ( $namespaceNotice && substr ( $namespaceNotice , 0 ,7 ) != "<p>&lt;" ) {
2046                  $namespaceNotice = '<div id="namespacebanner">' . $namespaceNotice . "</div>";
2047         } else {
2048                 $namespaceNotice = "";
2049         }
2050
2051         wfProfileOut( $fname );
2052         return $namespaceNotice;
2053 }
2054
2055 function wfGetSiteNotice() {
2056         global $wgUser, $wgSiteNotice;
2057         $fname = 'wfGetSiteNotice';
2058         wfProfileIn( $fname );
2059         $siteNotice = '';
2060
2061         if( wfRunHooks( 'SiteNoticeBefore', array( &$siteNotice ) ) ) {
2062                 if( is_object( $wgUser ) && $wgUser->isLoggedIn() ) {
2063                         $siteNotice = wfGetCachedNotice( 'sitenotice' );
2064                 } else {
2065                         $anonNotice = wfGetCachedNotice( 'anonnotice' );
2066                         if( !$anonNotice ) {
2067                                 $siteNotice = wfGetCachedNotice( 'sitenotice' );
2068                         } else {
2069                                 $siteNotice = $anonNotice;
2070                         }
2071                 }
2072                 if( !$siteNotice ) {
2073                         $siteNotice = wfGetCachedNotice( 'default' );
2074                 }
2075         }
2076
2077         wfRunHooks( 'SiteNoticeAfter', array( &$siteNotice ) );
2078         wfProfileOut( $fname );
2079         return $siteNotice;
2080 }
2081
2082 /**
2083  * BC wrapper for MimeMagic::singleton()
2084  * @deprecated
2085  */
2086 function &wfGetMimeMagic() {
2087         return MimeMagic::singleton();
2088 }
2089
2090 /**
2091  * Tries to get the system directory for temporary files.
2092  * The TMPDIR, TMP, and TEMP environment variables are checked in sequence,
2093  * and if none are set /tmp is returned as the generic Unix default.
2094  *
2095  * NOTE: When possible, use the tempfile() function to create temporary
2096  * files to avoid race conditions on file creation, etc.
2097  *
2098  * @return String
2099  */
2100 function wfTempDir() {
2101         foreach( array( 'TMPDIR', 'TMP', 'TEMP' ) as $var ) {
2102                 $tmp = getenv( $var );
2103                 if( $tmp && file_exists( $tmp ) && is_dir( $tmp ) && is_writable( $tmp ) ) {
2104                         return $tmp;
2105                 }
2106         }
2107         # Hope this is Unix of some kind!
2108         return '/tmp';
2109 }
2110
2111 /**
2112  * Make directory, and make all parent directories if they don't exist
2113  *
2114  * @param $dir String: full path to directory to create
2115  * @param $mode Integer: chmod value to use, default is $wgDirectoryMode
2116  * @param $caller String: optional caller param for debugging.
2117  * @return bool
2118  */
2119 function wfMkdirParents( $dir, $mode = null, $caller = null ) {
2120         global $wgDirectoryMode;
2121
2122         if ( !is_null( $caller ) ) {
2123                 wfDebug( "$caller: called wfMkdirParents($dir)" );
2124         }
2125
2126         if( strval( $dir ) === '' || file_exists( $dir ) )
2127                 return true;
2128
2129         $dir = str_replace( array( '\\', '/' ), DIRECTORY_SEPARATOR, $dir );
2130
2131         if ( is_null( $mode ) )
2132                 $mode = $wgDirectoryMode;
2133
2134         $ok = mkdir( $dir, $mode, true );  // PHP5 <3
2135         if( !$ok ) {
2136                 // PHP doesn't report the path in its warning message, so add our own to aid in diagnosis.
2137                 trigger_error( __FUNCTION__ . ": failed to mkdir \"$dir\" mode $mode", E_USER_WARNING );
2138         }
2139         return $ok;
2140 }
2141
2142 /**
2143  * Increment a statistics counter
2144  */
2145 function wfIncrStats( $key ) {
2146         global $wgStatsMethod;
2147
2148         if( $wgStatsMethod == 'udp' ) {
2149                 global $wgUDPProfilerHost, $wgUDPProfilerPort, $wgDBname;
2150                 static $socket;
2151                 if (!$socket) {
2152                         $socket=socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
2153                         $statline="stats/{$wgDBname} - 1 1 1 1 1 -total\n";
2154                         socket_sendto($socket,$statline,strlen($statline),0,$wgUDPProfilerHost,$wgUDPProfilerPort);
2155                 }
2156                 $statline="stats/{$wgDBname} - 1 1 1 1 1 {$key}\n";
2157                 @socket_sendto($socket,$statline,strlen($statline),0,$wgUDPProfilerHost,$wgUDPProfilerPort);
2158         } elseif( $wgStatsMethod == 'cache' ) {
2159                 global $wgMemc;
2160                 $key = wfMemcKey( 'stats', $key );
2161                 if ( is_null( $wgMemc->incr( $key ) ) ) {
2162                         $wgMemc->add( $key, 1 );
2163                 }
2164         } else {
2165                 // Disabled
2166         }
2167 }
2168
2169 /**
2170  * @param $nr Mixed: the number to format
2171  * @param $acc Integer: the number of digits after the decimal point, default 2
2172  * @param $round Boolean: whether or not to round the value, default true
2173  * @return float
2174  */
2175 function wfPercent( $nr, $acc = 2, $round = true ) {
2176         $ret = sprintf( "%.${acc}f", $nr );
2177         return $round ? round( $ret, $acc ) . '%' : "$ret%";
2178 }
2179
2180 /**
2181  * Encrypt a username/password.
2182  *
2183  * @param $userid Integer: ID of the user
2184  * @param $password String: password of the user
2185  * @return String: hashed password
2186  * @deprecated Use User::crypt() or User::oldCrypt() instead
2187  */
2188 function wfEncryptPassword( $userid, $password ) {
2189         wfDeprecated(__FUNCTION__);
2190         # Just wrap around User::oldCrypt()
2191         return User::oldCrypt($password, $userid);
2192 }
2193
2194 /**
2195  * Appends to second array if $value differs from that in $default
2196  */
2197 function wfAppendToArrayIfNotDefault( $key, $value, $default, &$changed ) {
2198         if ( is_null( $changed ) ) {
2199                 throw new MWException('GlobalFunctions::wfAppendToArrayIfNotDefault got null');
2200         }
2201         if ( $default[$key] !== $value ) {
2202                 $changed[$key] = $value;
2203         }
2204 }
2205
2206 /**
2207  * Since wfMsg() and co suck, they don't return false if the message key they
2208  * looked up didn't exist but a XHTML string, this function checks for the
2209  * nonexistance of messages by looking at wfMsg() output
2210  *
2211  * @param $msg      String: the message key looked up
2212  * @param $wfMsgOut String: the output of wfMsg*()
2213  * @return Boolean
2214  */
2215 function wfEmptyMsg( $msg, $wfMsgOut ) {
2216         return $wfMsgOut === htmlspecialchars( "<$msg>" );
2217 }
2218
2219 /**
2220  * Find out whether or not a mixed variable exists in a string
2221  *
2222  * @param $needle String
2223  * @param $str String
2224  * @return Boolean
2225  */
2226 function in_string( $needle, $str ) {
2227         return strpos( $str, $needle ) !== false;
2228 }
2229
2230 function wfSpecialList( $page, $details ) {
2231         global $wgContLang;
2232         $details = $details ? ' ' . $wgContLang->getDirMark() . "($details)" : "";
2233         return $page . $details;
2234 }
2235
2236 /**
2237  * Returns a regular expression of url protocols
2238  *
2239  * @return String
2240  */
2241 function wfUrlProtocols() {
2242         global $wgUrlProtocols;
2243
2244         // This function is called a lot, cache its return value
2245         // TODO: Cache this in memcached instead?
2246         static $retval = null;
2247         if ( !is_null( $retval ) )
2248                 return $retval;
2249
2250         // Support old-style $wgUrlProtocols strings, for backwards compatibility
2251         // with LocalSettings files from 1.5
2252         if ( is_array( $wgUrlProtocols ) ) {
2253                 $protocols = array();
2254                 foreach ($wgUrlProtocols as $protocol)
2255                         $protocols[] = preg_quote( $protocol, '/' );
2256
2257                 $retval = implode( '|', $protocols );
2258         } else {
2259                 $retval = $wgUrlProtocols;
2260         }
2261
2262         return $retval;
2263 }
2264
2265 /**
2266  * Safety wrapper around ini_get() for boolean settings.
2267  * The values returned from ini_get() are pre-normalized for settings
2268  * set via php.ini or php_flag/php_admin_flag... but *not*
2269  * for those set via php_value/php_admin_value.
2270  *
2271  * It's fairly common for people to use php_value instead of php_flag,
2272  * which can leave you with an 'off' setting giving a false positive
2273  * for code that just takes the ini_get() return value as a boolean.
2274  *
2275  * To make things extra interesting, setting via php_value accepts
2276  * "true" and "yes" as true, but php.ini and php_flag consider them false. :)
2277  * Unrecognized values go false... again opposite PHP's own coercion
2278  * from string to bool.
2279  *
2280  * Luckily, 'properly' set settings will always come back as '0' or '1',
2281  * so we only have to worry about them and the 'improper' settings.
2282  *
2283  * I frickin' hate PHP... :P
2284  *
2285  * @param $setting String
2286  * @return Bool
2287  */
2288 function wfIniGetBool( $setting ) {
2289         $val = ini_get( $setting );
2290         // 'on' and 'true' can't have whitespace around them, but '1' can.
2291         return strtolower( $val ) == 'on'
2292                 || strtolower( $val ) == 'true'
2293                 || strtolower( $val ) == 'yes'
2294                 || preg_match( "/^\s*[+-]?0*[1-9]/", $val ); // approx C atoi() function
2295 }
2296
2297 /**
2298  * Execute a shell command, with time and memory limits mirrored from the PHP
2299  * configuration if supported.
2300  * @param $cmd Command line, properly escaped for shell.
2301  * @param &$retval optional, will receive the program's exit code.
2302  *                 (non-zero is usually failure)
2303  * @return collected stdout as a string (trailing newlines stripped)
2304  */
2305 function wfShellExec( $cmd, &$retval=null ) {
2306         global $IP, $wgMaxShellMemory, $wgMaxShellFileSize, $wgMaxShellTime;
2307
2308         static $disabled;
2309         if ( is_null( $disabled ) ) {
2310                 $disabled = false;
2311                 if( wfIniGetBool( 'safe_mode' ) ) {
2312                         wfDebug( "wfShellExec can't run in safe_mode, PHP's exec functions are too broken.\n" );
2313                         $disabled = true;
2314                 }
2315                 $functions = explode( ',', ini_get( 'disable_functions' ) );
2316                 $functions = array_map( 'trim', $functions );
2317                 $functions = array_map( 'strtolower', $functions );
2318                 if ( in_array( 'passthru', $functions ) ) {
2319                         wfDebug( "passthru is in disabled_functions\n" );
2320                         $disabled = true;
2321                 }
2322         }
2323         if ( $disabled ) {
2324                 $retval = 1;
2325                 return "Unable to run external programs in safe mode.";
2326         }
2327
2328         wfInitShellLocale();
2329
2330         if ( php_uname( 's' ) == 'Linux' ) {
2331                 $time = intval( $wgMaxShellTime );
2332                 $mem = intval( $wgMaxShellMemory );
2333                 $filesize = intval( $wgMaxShellFileSize );
2334
2335                 if ( $time > 0 && $mem > 0 ) {
2336                         $script = "$IP/bin/ulimit4.sh";
2337                         if ( is_executable( $script ) ) {
2338                                 $cmd = escapeshellarg( $script ) . " $time $mem $filesize " . escapeshellarg( $cmd );
2339                         }
2340                 }
2341         } elseif ( php_uname( 's' ) == 'Windows NT' &&
2342                 version_compare( PHP_VERSION, '5.3.0', '<' ) )
2343         {
2344                 # This is a hack to work around PHP's flawed invocation of cmd.exe
2345                 # http://news.php.net/php.internals/21796
2346                 # Which is fixed in 5.3.0 :)
2347                 $cmd = '"' . $cmd . '"';
2348         }
2349         wfDebug( "wfShellExec: $cmd\n" );
2350
2351         $retval = 1; // error by default?
2352         ob_start();
2353         passthru( $cmd, $retval );
2354         $output = ob_get_contents();
2355         ob_end_clean();
2356
2357         if ( $retval == 127 ) {
2358                 wfDebugLog( 'exec', "Possibly missing executable file: $cmd\n" );
2359         }
2360         return $output;
2361 }
2362
2363 /**
2364  * Workaround for http://bugs.php.net/bug.php?id=45132
2365  * escapeshellarg() destroys non-ASCII characters if LANG is not a UTF-8 locale
2366  */
2367 function wfInitShellLocale() {
2368         static $done = false;
2369         if ( $done ) return;
2370         $done = true;
2371         global $wgShellLocale;
2372         if ( !wfIniGetBool( 'safe_mode' ) ) {
2373                 putenv( "LC_CTYPE=$wgShellLocale" );
2374                 setlocale( LC_CTYPE, $wgShellLocale );
2375         }
2376 }
2377
2378 /**
2379  * This function works like "use VERSION" in Perl, the program will die with a
2380  * backtrace if the current version of PHP is less than the version provided
2381  *
2382  * This is useful for extensions which due to their nature are not kept in sync
2383  * with releases, and might depend on other versions of PHP than the main code
2384  *
2385  * Note: PHP might die due to parsing errors in some cases before it ever
2386  *       manages to call this function, such is life
2387  *
2388  * @see perldoc -f use
2389  *
2390  * @param $req_ver Mixed: the version to check, can be a string, an integer, or
2391  *                 a float
2392  */
2393 function wfUsePHP( $req_ver ) {
2394         $php_ver = PHP_VERSION;
2395
2396         if ( version_compare( $php_ver, (string)$req_ver, '<' ) )
2397                  throw new MWException( "PHP $req_ver required--this is only $php_ver" );
2398 }
2399
2400 /**
2401  * This function works like "use VERSION" in Perl except it checks the version
2402  * of MediaWiki, the program will die with a backtrace if the current version
2403  * of MediaWiki is less than the version provided.
2404  *
2405  * This is useful for extensions which due to their nature are not kept in sync
2406  * with releases
2407  *
2408  * @see perldoc -f use
2409  *
2410  * @param $req_ver Mixed: the version to check, can be a string, an integer, or
2411  *                 a float
2412  */
2413 function wfUseMW( $req_ver ) {
2414         global $wgVersion;
2415
2416         if ( version_compare( $wgVersion, (string)$req_ver, '<' ) )
2417                 throw new MWException( "MediaWiki $req_ver required--this is only $wgVersion" );
2418 }
2419
2420 /**
2421  * @deprecated use StringUtils::escapeRegexReplacement
2422  */
2423 function wfRegexReplacement( $string ) {
2424         return StringUtils::escapeRegexReplacement( $string );
2425 }
2426
2427 /**
2428  * Return the final portion of a pathname.
2429  * Reimplemented because PHP5's basename() is buggy with multibyte text.
2430  * http://bugs.php.net/bug.php?id=33898
2431  *
2432  * PHP's basename() only considers '\' a pathchar on Windows and Netware.
2433  * We'll consider it so always, as we don't want \s in our Unix paths either.
2434  *
2435  * @param $path String
2436  * @param $suffix String: to remove if present
2437  * @return String
2438  */
2439 function wfBaseName( $path, $suffix='' ) {
2440         $encSuffix = ($suffix == '')
2441                 ? ''
2442                 : ( '(?:' . preg_quote( $suffix, '#' ) . ')?' );
2443         $matches = array();
2444         if( preg_match( "#([^/\\\\]*?){$encSuffix}[/\\\\]*$#", $path, $matches ) ) {
2445                 return $matches[1];
2446         } else {
2447                 return '';
2448         }
2449 }
2450
2451 /**
2452  * Generate a relative path name to the given file.
2453  * May explode on non-matching case-insensitive paths,
2454  * funky symlinks, etc.
2455  *
2456  * @param $path String: absolute destination path including target filename
2457  * @param $from String: Absolute source path, directory only
2458  * @return String
2459  */
2460 function wfRelativePath( $path, $from ) {
2461         // Normalize mixed input on Windows...
2462         $path = str_replace( '/', DIRECTORY_SEPARATOR, $path );
2463         $from = str_replace( '/', DIRECTORY_SEPARATOR, $from );
2464
2465         // Trim trailing slashes -- fix for drive root
2466         $path = rtrim( $path, DIRECTORY_SEPARATOR );
2467         $from = rtrim( $from, DIRECTORY_SEPARATOR );
2468
2469         $pieces  = explode( DIRECTORY_SEPARATOR, dirname( $path ) );
2470         $against = explode( DIRECTORY_SEPARATOR, $from );
2471
2472         if( $pieces[0] !== $against[0] ) {
2473                 // Non-matching Windows drive letters?
2474                 // Return a full path.
2475                 return $path;
2476         }
2477
2478         // Trim off common prefix
2479         while( count( $pieces ) && count( $against )
2480                 && $pieces[0] == $against[0] ) {
2481                 array_shift( $pieces );
2482                 array_shift( $against );
2483         }
2484
2485         // relative dots to bump us to the parent
2486         while( count( $against ) ) {
2487                 array_unshift( $pieces, '..' );
2488                 array_shift( $against );
2489         }
2490
2491         array_push( $pieces, wfBaseName( $path ) );
2492
2493         return implode( DIRECTORY_SEPARATOR, $pieces );
2494 }
2495
2496 /**
2497  * Backwards array plus for people who haven't bothered to read the PHP manual
2498  * XXX: will not darn your socks for you.
2499  *
2500  * @param $array1 Array
2501  * @param [$array2, [...]] Arrays
2502  * @return Array
2503  */
2504 function wfArrayMerge( $array1/* ... */ ) {
2505         $args = func_get_args();
2506         $args = array_reverse( $args, true );
2507         $out = array();
2508         foreach ( $args as $arg ) {
2509                 $out += $arg;
2510         }
2511         return $out;
2512 }
2513
2514 /**
2515  * Merge arrays in the style of getUserPermissionsErrors, with duplicate removal
2516  * e.g.
2517  *      wfMergeErrorArrays(
2518  *              array( array( 'x' ) ),
2519  *              array( array( 'x', '2' ) ),
2520  *              array( array( 'x' ) ),
2521  *              array( array( 'y') )
2522  *      );
2523  * returns:
2524  *              array(
2525  *              array( 'x', '2' ),
2526  *              array( 'x' ),
2527  *              array( 'y' )
2528  *      )
2529  */
2530 function wfMergeErrorArrays(/*...*/) {
2531         $args = func_get_args();
2532         $out = array();
2533         foreach ( $args as $errors ) {
2534                 foreach ( $errors as $params ) {
2535                         $spec = implode( "\t", $params );
2536                         $out[$spec] = $params;
2537                 }
2538         }
2539         return array_values( $out );
2540 }
2541
2542 /**
2543  * parse_url() work-alike, but non-broken.  Differences:
2544  *
2545  * 1) Does not raise warnings on bad URLs (just returns false)
2546  * 2) Handles protocols that don't use :// (e.g., mailto: and news:) correctly
2547  * 3) Adds a "delimiter" element to the array, either '://' or ':' (see (2))
2548  *
2549  * @param $url String: a URL to parse
2550  * @return Array: bits of the URL in an associative array, per PHP docs
2551  */
2552 function wfParseUrl( $url ) {
2553         global $wgUrlProtocols; // Allow all protocols defined in DefaultSettings/LocalSettings.php
2554         wfSuppressWarnings();
2555         $bits = parse_url( $url );
2556         wfRestoreWarnings();
2557         if ( !$bits ) {
2558                 return false;
2559         }
2560
2561         // most of the protocols are followed by ://, but mailto: and sometimes news: not, check for it
2562         if ( in_array( $bits['scheme'] . '://', $wgUrlProtocols ) ) {
2563                 $bits['delimiter'] = '://';
2564         } elseif ( in_array( $bits['scheme'] . ':', $wgUrlProtocols ) ) {
2565                 $bits['delimiter'] = ':';
2566                 // parse_url detects for news: and mailto: the host part of an url as path
2567                 // We have to correct this wrong detection
2568                 if ( isset ( $bits['path'] ) ) {
2569                         $bits['host'] = $bits['path'];
2570                         $bits['path'] = '';
2571                 }
2572         } else {
2573                 return false;
2574         }
2575
2576         return $bits;
2577 }
2578
2579 /**
2580  * Make a URL index, appropriate for the el_index field of externallinks.
2581  */
2582 function wfMakeUrlIndex( $url ) {
2583         $bits = wfParseUrl( $url );
2584
2585         // Reverse the labels in the hostname, convert to lower case
2586         // For emails reverse domainpart only
2587         if ( $bits['scheme'] == 'mailto' ) {
2588                 $mailparts = explode( '@', $bits['host'], 2 );
2589                 if ( count($mailparts) === 2 ) {
2590                         $domainpart = strtolower( implode( '.', array_reverse( explode( '.', $mailparts[1] ) ) ) );
2591                 } else {
2592                         // No domain specified, don't mangle it
2593                         $domainpart = '';
2594                 }
2595                 $reversedHost = $domainpart . '@' . $mailparts[0];
2596         } else {
2597                 $reversedHost = strtolower( implode( '.', array_reverse( explode( '.', $bits['host'] ) ) ) );
2598         }
2599         // Add an extra dot to the end
2600         // Why? Is it in wrong place in mailto links?
2601         if ( substr( $reversedHost, -1, 1 ) !== '.' ) {
2602                 $reversedHost .= '.';
2603         }
2604         // Reconstruct the pseudo-URL
2605         $prot = $bits['scheme'];
2606         $index = $prot . $bits['delimiter'] . $reversedHost;
2607         // Leave out user and password. Add the port, path, query and fragment
2608         if ( isset( $bits['port'] ) )      $index .= ':' . $bits['port'];
2609         if ( isset( $bits['path'] ) ) {
2610                 $index .= $bits['path'];
2611         } else {
2612                 $index .= '/';
2613         }
2614         if ( isset( $bits['query'] ) )     $index .= '?' . $bits['query'];
2615         if ( isset( $bits['fragment'] ) )  $index .= '#' . $bits['fragment'];
2616         return $index;
2617 }
2618
2619 /**
2620  * Do any deferred updates and clear the list
2621  * TODO: This could be in Wiki.php if that class made any sense at all
2622  */
2623 function wfDoUpdates()
2624 {
2625         global $wgPostCommitUpdateList, $wgDeferredUpdateList;
2626         foreach ( $wgDeferredUpdateList as $update ) {
2627                 $update->doUpdate();
2628         }
2629         foreach ( $wgPostCommitUpdateList as $update ) {
2630                 $update->doUpdate();
2631         }
2632         $wgDeferredUpdateList = array();
2633         $wgPostCommitUpdateList = array();
2634 }
2635
2636 /**
2637  * @deprecated use StringUtils::explodeMarkup
2638  */
2639 function wfExplodeMarkup( $separator, $text ) {
2640         return StringUtils::explodeMarkup( $separator, $text );
2641 }
2642
2643 /**
2644  * Convert an arbitrarily-long digit string from one numeric base
2645  * to another, optionally zero-padding to a minimum column width.
2646  *
2647  * Supports base 2 through 36; digit values 10-36 are represented
2648  * as lowercase letters a-z. Input is case-insensitive.
2649  *
2650  * @param $input String: of digits
2651  * @param $sourceBase Integer: 2-36
2652  * @param $destBase Integer: 2-36
2653  * @param $pad Integer: 1 or greater
2654  * @param $lowercase Boolean
2655  * @return String or false on invalid input
2656  */
2657 function wfBaseConvert( $input, $sourceBase, $destBase, $pad=1, $lowercase=true ) {
2658         $input = strval( $input );
2659         if( $sourceBase < 2 ||
2660                 $sourceBase > 36 ||
2661                 $destBase < 2 ||
2662                 $destBase > 36 ||
2663                 $pad < 1 ||
2664                 $sourceBase != intval( $sourceBase ) ||
2665                 $destBase != intval( $destBase ) ||
2666                 $pad != intval( $pad ) ||
2667                 !is_string( $input ) ||
2668                 $input == '' ) {
2669                 return false;
2670         }
2671         $digitChars = ( $lowercase ) ?  '0123456789abcdefghijklmnopqrstuvwxyz' : '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
2672         $inDigits = array();
2673         $outChars = '';
2674
2675         // Decode and validate input string
2676         $input = strtolower( $input );
2677         for( $i = 0; $i < strlen( $input ); $i++ ) {
2678                 $n = strpos( $digitChars, $input{$i} );
2679                 if( $n === false || $n > $sourceBase ) {
2680                         return false;
2681                 }
2682                 $inDigits[] = $n;
2683         }
2684
2685         // Iterate over the input, modulo-ing out an output digit
2686         // at a time until input is gone.
2687         while( count( $inDigits ) ) {
2688                 $work = 0;
2689                 $workDigits = array();
2690
2691                 // Long division...
2692                 foreach( $inDigits as $digit ) {
2693                         $work *= $sourceBase;
2694                         $work += $digit;
2695
2696                         if( $work < $destBase ) {
2697                                 // Gonna need to pull another digit.
2698                                 if( count( $workDigits ) ) {
2699                                         // Avoid zero-padding; this lets us find
2700                                         // the end of the input very easily when
2701                                         // length drops to zero.
2702                                         $workDigits[] = 0;
2703                                 }
2704                         } else {
2705                                 // Finally! Actual division!
2706                                 $workDigits[] = intval( $work / $destBase );
2707
2708                                 // Isn't it annoying that most programming languages
2709                                 // don't have a single divide-and-remainder operator,
2710                                 // even though the CPU implements it that way?
2711                                 $work = $work % $destBase;
2712                         }
2713                 }
2714
2715                 // All that division leaves us with a remainder,
2716                 // which is conveniently our next output digit.
2717                 $outChars .= $digitChars[$work];
2718
2719                 // And we continue!
2720                 $inDigits = $workDigits;
2721         }
2722
2723         while( strlen( $outChars ) < $pad ) {
2724                 $outChars .= '0';
2725         }
2726
2727         return strrev( $outChars );
2728 }
2729
2730 /**
2731  * Create an object with a given name and an array of construct parameters
2732  * @param $name String
2733  * @param $p Array: parameters
2734  */
2735 function wfCreateObject( $name, $p ){
2736         $p = array_values( $p );
2737         switch ( count( $p ) ) {
2738                 case 0:
2739                         return new $name;
2740                 case 1:
2741                         return new $name( $p[0] );
2742                 case 2:
2743                         return new $name( $p[0], $p[1] );
2744                 case 3:
2745                         return new $name( $p[0], $p[1], $p[2] );
2746                 case 4:
2747                         return new $name( $p[0], $p[1], $p[2], $p[3] );
2748                 case 5:
2749                         return new $name( $p[0], $p[1], $p[2], $p[3], $p[4] );
2750                 case 6:
2751                         return new $name( $p[0], $p[1], $p[2], $p[3], $p[4], $p[5] );
2752                 default:
2753                         throw new MWException( "Too many arguments to construtor in wfCreateObject" );
2754         }
2755 }
2756
2757 /**
2758  * Alias for modularized function
2759  * @deprecated Use Http::get() instead
2760  */
2761 function wfGetHTTP( $url ) {
2762         wfDeprecated(__FUNCTION__);
2763         return Http::get( $url );
2764 }
2765
2766 /**
2767  * Alias for modularized function
2768  * @deprecated Use Http::isLocalURL() instead
2769  */
2770 function wfIsLocalURL( $url ) {
2771         wfDeprecated(__FUNCTION__);
2772         return Http::isLocalURL( $url );
2773 }
2774
2775 function wfHttpOnlySafe() {
2776         global $wgHttpOnlyBlacklist;
2777         if( !version_compare("5.2", PHP_VERSION, "<") )
2778                 return false;
2779
2780         if( isset( $_SERVER['HTTP_USER_AGENT'] ) ) {
2781                 foreach( $wgHttpOnlyBlacklist as $regex ) {
2782                         if( preg_match( $regex, $_SERVER['HTTP_USER_AGENT'] ) ) {
2783                                 return false;
2784                         }
2785                 }
2786         }
2787
2788         return true;
2789 }
2790
2791 /**
2792  * Initialise php session
2793  */
2794 function wfSetupSession() {
2795         global $wgSessionsInMemcached, $wgCookiePath, $wgCookieDomain,
2796                         $wgCookieSecure, $wgCookieHttpOnly, $wgSessionHandler;
2797         if( $wgSessionsInMemcached ) {
2798                 require_once( 'MemcachedSessions.php' );
2799         } elseif( $wgSessionHandler && $wgSessionHandler != ini_get( 'session.save_handler' ) ) {
2800                 # Only set this if $wgSessionHandler isn't null and session.save_handler
2801                 # hasn't already been set to the desired value (that causes errors)
2802                 ini_set ( 'session.save_handler', $wgSessionHandler );
2803         }
2804         $httpOnlySafe = wfHttpOnlySafe();
2805         wfDebugLog( 'cookie',
2806                 'session_set_cookie_params: "' . implode( '", "',
2807                         array(
2808                                 0,
2809                                 $wgCookiePath,
2810                                 $wgCookieDomain,
2811                                 $wgCookieSecure,
2812                                 $httpOnlySafe && $wgCookieHttpOnly ) ) . '"' );
2813         if( $httpOnlySafe && $wgCookieHttpOnly ) {
2814                 session_set_cookie_params( 0, $wgCookiePath, $wgCookieDomain, $wgCookieSecure, $wgCookieHttpOnly );
2815         } else {
2816                 // PHP 5.1 throws warnings if you pass the HttpOnly parameter for 5.2.
2817                 session_set_cookie_params( 0, $wgCookiePath, $wgCookieDomain, $wgCookieSecure );
2818         }
2819         session_cache_limiter( 'private, must-revalidate' );
2820         wfSuppressWarnings();
2821         session_start();
2822         wfRestoreWarnings();
2823 }
2824
2825 /**
2826  * Get an object from the precompiled serialized directory
2827  *
2828  * @return Mixed: the variable on success, false on failure
2829  */
2830 function wfGetPrecompiledData( $name ) {
2831         global $IP;
2832
2833         $file = "$IP/serialized/$name";
2834         if ( file_exists( $file ) ) {
2835                 $blob = file_get_contents( $file );
2836                 if ( $blob ) {
2837                         return unserialize( $blob );
2838                 }
2839         }
2840         return false;
2841 }
2842
2843 function wfGetCaller( $level = 2 ) {
2844         $backtrace = wfDebugBacktrace();
2845         if ( isset( $backtrace[$level] ) ) {
2846                 return wfFormatStackFrame($backtrace[$level]);
2847         } else {
2848                 $caller = 'unknown';
2849         }
2850         return $caller;
2851 }
2852
2853 /**
2854  * Return a string consisting all callers in stack, somewhat useful sometimes
2855  * for profiling specific points
2856  */
2857 function wfGetAllCallers() {
2858         return implode('/', array_map('wfFormatStackFrame',array_reverse(wfDebugBacktrace())));
2859 }
2860
2861 /**
2862  * Return a string representation of frame
2863  */
2864 function wfFormatStackFrame($frame) {
2865         return isset( $frame["class"] )?
2866                 $frame["class"]."::".$frame["function"]:
2867                 $frame["function"];
2868 }
2869
2870 /**
2871  * Get a cache key
2872  */
2873 function wfMemcKey( /*... */ ) {
2874         $args = func_get_args();
2875         $key = wfWikiID() . ':' . implode( ':', $args );
2876         $key = str_replace( ' ', '_', $key );
2877         return $key;
2878 }
2879
2880 /**
2881  * Get a cache key for a foreign DB
2882  */
2883 function wfForeignMemcKey( $db, $prefix /*, ... */ ) {
2884         $args = array_slice( func_get_args(), 2 );
2885         if ( $prefix ) {
2886                 $key = "$db-$prefix:" . implode( ':', $args );
2887         } else {
2888                 $key = $db . ':' . implode( ':', $args );
2889         }
2890         return $key;
2891 }
2892
2893 /**
2894  * Get an ASCII string identifying this wiki
2895  * This is used as a prefix in memcached keys
2896  */
2897 function wfWikiID() {
2898         global $wgDBprefix, $wgDBname;
2899         if ( $wgDBprefix ) {
2900                 return "$wgDBname-$wgDBprefix";
2901         } else {
2902                 return $wgDBname;
2903         }
2904 }
2905
2906 /**
2907  * Split a wiki ID into DB name and table prefix
2908  */
2909 function wfSplitWikiID( $wiki ) {
2910         $bits = explode( '-', $wiki, 2 );
2911         if ( count( $bits ) < 2 ) {
2912                 $bits[] = '';
2913         }
2914         return $bits;
2915 }
2916
2917 /*
2918  * Get a Database object.
2919  * @param $db Integer: index of the connection to get. May be DB_MASTER for the
2920  *            master (for write queries), DB_SLAVE for potentially lagged read
2921  *            queries, or an integer >= 0 for a particular server.
2922  *
2923  * @param $groups Mixed: query groups. An array of group names that this query
2924  *                belongs to. May contain a single string if the query is only
2925  *                in one group.
2926  *
2927  * @param $wiki String: the wiki ID, or false for the current wiki
2928  *
2929  * Note: multiple calls to wfGetDB(DB_SLAVE) during the course of one request
2930  * will always return the same object, unless the underlying connection or load
2931  * balancer is manually destroyed.
2932  */
2933 function &wfGetDB( $db, $groups = array(), $wiki = false ) {
2934         return wfGetLB( $wiki )->getConnection( $db, $groups, $wiki );
2935 }
2936
2937 /**
2938  * Get a load balancer object.
2939  *
2940  * @param $wiki String: wiki ID, or false for the current wiki
2941  * @return LoadBalancer
2942  */
2943 function wfGetLB( $wiki = false ) {
2944         return wfGetLBFactory()->getMainLB( $wiki );
2945 }
2946
2947 /**
2948  * Get the load balancer factory object
2949  */
2950 function &wfGetLBFactory() {
2951         return LBFactory::singleton();
2952 }
2953
2954 /**
2955  * Find a file.
2956  * Shortcut for RepoGroup::singleton()->findFile()
2957  * @param $title Either a string or Title object
2958  * @param $options Associative array of options:
2959  *     time:           requested time for an archived image, or false for the
2960  *                     current version. An image object will be returned which was
2961  *                     created at the specified time.
2962  *
2963  *     ignoreRedirect: If true, do not follow file redirects
2964  *
2965  *     private:        If true, return restricted (deleted) files if the current
2966  *                     user is allowed to view them. Otherwise, such files will not
2967  *                     be found.
2968  *
2969  *     bypassCache:    If true, do not use the process-local cache of File objects
2970  *
2971  * @return File, or false if the file does not exist
2972  */
2973 function wfFindFile( $title, $options = array() ) {
2974         return RepoGroup::singleton()->findFile( $title, $options );
2975 }
2976
2977 /**
2978  * Get an object referring to a locally registered file.
2979  * Returns a valid placeholder object if the file does not exist.
2980  * @param $title Either a string or Title object
2981  * @return File, or null if passed an invalid Title
2982  */
2983 function wfLocalFile( $title ) {
2984         return RepoGroup::singleton()->getLocalRepo()->newFile( $title );
2985 }
2986
2987 /**
2988  * Should low-performance queries be disabled?
2989  *
2990  * @return Boolean
2991  */
2992 function wfQueriesMustScale() {
2993         global $wgMiserMode;
2994         return $wgMiserMode
2995                 || ( SiteStats::pages() > 100000
2996                 && SiteStats::edits() > 1000000
2997                 && SiteStats::users() > 10000 );
2998 }
2999
3000 /**
3001  * Get the path to a specified script file, respecting file
3002  * extensions; this is a wrapper around $wgScriptExtension etc.
3003  *
3004  * @param $script String: script filename, sans extension
3005  * @return String
3006  */
3007 function wfScript( $script = 'index' ) {
3008         global $wgScriptPath, $wgScriptExtension;
3009         return "{$wgScriptPath}/{$script}{$wgScriptExtension}";
3010 }
3011 /**
3012  * Get the script url.
3013  *
3014  * @return script url
3015  */
3016 function wfGetScriptUrl(){
3017         if( isset( $_SERVER['SCRIPT_NAME'] ) ) {
3018                 #
3019                 # as it was called, minus the query string.
3020                 #
3021                 # Some sites use Apache rewrite rules to handle subdomains,
3022                 # and have PHP set up in a weird way that causes PHP_SELF
3023                 # to contain the rewritten URL instead of the one that the
3024                 # outside world sees.
3025                 #
3026                 # If in this mode, use SCRIPT_URL instead, which mod_rewrite
3027                 # provides containing the "before" URL.
3028                 return $_SERVER['SCRIPT_NAME'];
3029         } else {
3030                 return $_SERVER['URL'];
3031         }
3032 }
3033
3034 /**
3035  * Convenience function converts boolean values into "true"
3036  * or "false" (string) values
3037  *
3038  * @param $value Boolean
3039  * @return String
3040  */
3041 function wfBoolToStr( $value ) {
3042         return $value ? 'true' : 'false';
3043 }
3044
3045 /**
3046  * Load an extension messages file
3047  * @deprecated
3048  */
3049 function wfLoadExtensionMessages( $extensionName, $langcode = false ) {
3050 }
3051
3052 /**
3053  * Get a platform-independent path to the null file, e.g.
3054  * /dev/null
3055  *
3056  * @return string
3057  */
3058 function wfGetNull() {
3059         return wfIsWindows()
3060                 ? 'NUL'
3061                 : '/dev/null';
3062 }
3063
3064 /**
3065  * Displays a maxlag error
3066  *
3067  * @param $host String: server that lags the most
3068  * @param $lag Integer: maxlag (actual)
3069  * @param $maxLag Integer: maxlag (requested)
3070  */
3071 function wfMaxlagError( $host, $lag, $maxLag ) {
3072         global $wgShowHostnames;
3073         header( 'HTTP/1.1 503 Service Unavailable' );
3074         header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
3075         header( 'X-Database-Lag: ' . intval( $lag ) );
3076         header( 'Content-Type: text/plain' );
3077         if( $wgShowHostnames ) {
3078                 echo "Waiting for $host: $lag seconds lagged\n";
3079         } else {
3080                 echo "Waiting for a database server: $lag seconds lagged\n";
3081         }
3082 }
3083
3084 /**
3085  * Throws a warning that $function is deprecated
3086  * @param $function String
3087  * @return null
3088  */
3089 function wfDeprecated( $function ) {
3090         static $functionsWarned = array();
3091         if ( !isset( $functionsWarned[$function] ) ) {
3092                 $functionsWarned[$function] = true;
3093                 wfWarn( "Use of $function is deprecated.", 2 );
3094         }
3095 }
3096
3097 /**
3098  * Send a warning either to the debug log or in a PHP error depending on
3099  * $wgDevelopmentWarnings
3100  *
3101  * @param $msg String: message to send
3102  * @param $callerOffset Integer: number of itmes to go back in the backtrace to
3103  *        find the correct caller (1 = function calling wfWarn, ...)
3104  * @param $level Integer: PHP error level; only used when $wgDevelopmentWarnings
3105  *        is true
3106  */
3107 function wfWarn( $msg, $callerOffset = 1, $level = E_USER_NOTICE ) {
3108         $callers = wfDebugBacktrace();
3109         if( isset( $callers[$callerOffset+1] ) ){
3110                 $callerfunc = $callers[$callerOffset+1];
3111                 $callerfile = $callers[$callerOffset];
3112                 if( isset( $callerfile['file'] ) && isset( $callerfile['line'] ) ){
3113                         $file = $callerfile['file'] . ' at line ' . $callerfile['line'];
3114                 } else {
3115                         $file = '(internal function)';
3116                 }
3117                 $func = '';
3118                 if( isset( $callerfunc['class'] ) )
3119                         $func .= $callerfunc['class'] . '::';
3120                 $func .= @$callerfunc['function'];
3121                 $msg .= " [Called from $func in $file]";
3122         }
3123
3124         global $wgDevelopmentWarnings;
3125         if ( $wgDevelopmentWarnings ) {
3126                 trigger_error( $msg, $level );
3127         } else {
3128                 wfDebug( "$msg\n" );
3129         }
3130 }
3131
3132 /**
3133  * Sleep until the worst slave's replication lag is less than or equal to
3134  * $maxLag, in seconds.  Use this when updating very large numbers of rows, as
3135  * in maintenance scripts, to avoid causing too much lag.  Of course, this is
3136  * a no-op if there are no slaves.
3137  *
3138  * Every time the function has to wait for a slave, it will print a message to
3139  * that effect (and then sleep for a little while), so it's probably not best
3140  * to use this outside maintenance scripts in its present form.
3141  *
3142  * @param $maxLag Integer
3143  * @param $wiki mixed Wiki identifier accepted by wfGetLB
3144  * @return null
3145  */
3146 function wfWaitForSlaves( $maxLag, $wiki = false ) {
3147         if( $maxLag ) {
3148                 $lb = wfGetLB( $wiki );
3149                 list( $host, $lag ) = $lb->getMaxLag( $wiki );
3150                 while( $lag > $maxLag ) {
3151                         $name = @gethostbyaddr( $host );
3152                         if( $name !== false ) {
3153                                 $host = $name;
3154                         }
3155                         print "Waiting for $host (lagged $lag seconds)...\n";
3156                         sleep($maxLag);
3157                         list( $host, $lag ) = $lb->getMaxLag();
3158                 }
3159         }
3160 }
3161
3162 /**
3163  * Output some plain text in command-line mode or in the installer (updaters.inc).
3164  * Do not use it in any other context, its behaviour is subject to change.
3165  */
3166 function wfOut( $s ) {
3167         static $lineStarted = false;
3168         global $wgCommandLineMode;
3169         if ( $wgCommandLineMode && !defined( 'MEDIAWIKI_INSTALL' ) ) {
3170                 echo $s;
3171         } else {
3172                 echo htmlspecialchars( $s );
3173         }
3174         flush();
3175 }
3176
3177 /**
3178  * Count down from $n to zero on the terminal, with a one-second pause
3179  * between showing each number. For use in command-line scripts.
3180  */
3181 function wfCountDown( $n ) {
3182         for ( $i = $n; $i >= 0; $i-- ) {
3183                 if ( $i != $n ) {
3184                         echo str_repeat( "\x08", strlen( $i + 1 ) );
3185                 }
3186                 echo $i;
3187                 flush();
3188                 if ( $i ) {
3189                         sleep( 1 );
3190                 }
3191         }
3192         echo "\n";
3193 }
3194
3195 /** Generate a random 32-character hexadecimal token.
3196  * @param $salt Mixed: some sort of salt, if necessary, to add to random
3197  *              characters before hashing.
3198  */
3199 function wfGenerateToken( $salt = '' ) {
3200         $salt = serialize($salt);
3201
3202         return md5( mt_rand( 0, 0x7fffffff ) . $salt );
3203 }
3204
3205 /**
3206  * Replace all invalid characters with -
3207  * @param $name Mixed: filename to process
3208  */
3209 function wfStripIllegalFilenameChars( $name ) {
3210         global $wgIllegalFileChars;
3211         $name = wfBaseName( $name );
3212         $name = preg_replace("/[^".Title::legalChars()."]".($wgIllegalFileChars ? "|[".$wgIllegalFileChars."]":"")."/",'-',$name);
3213         return $name;
3214 }
3215
3216 /**
3217  * Insert array into another array after the specified *KEY*
3218  * @param $array Array: The array.
3219  * @param $insert Array: The array to insert.
3220  * @param $after Mixed: The key to insert after
3221  */
3222 function wfArrayInsertAfter( $array, $insert, $after ) {
3223         // Find the offset of the element to insert after.
3224         $keys = array_keys($array);
3225         $offsetByKey = array_flip( $keys );
3226
3227         $offset = $offsetByKey[$after];
3228
3229         // Insert at the specified offset
3230         $before = array_slice( $array, 0, $offset + 1, true );
3231         $after = array_slice( $array, $offset + 1, count($array)-$offset, true );
3232
3233         $output = $before + $insert + $after;
3234
3235         return $output;
3236 }
3237
3238 /* Recursively converts the parameter (an object) to an array with the same data */
3239 function wfObjectToArray( $object, $recursive = true ) {
3240         $array = array();
3241         foreach ( get_object_vars($object) as $key => $value ) {
3242                 if ( is_object($value) && $recursive ) {
3243                         $value = wfObjectToArray( $value );
3244                 }
3245
3246                 $array[$key] = $value;
3247         }
3248
3249         return $array;
3250 }
3251
3252 /**
3253  * Set PHP's memory limit to the larger of php.ini or $wgMemoryLimit;
3254  * @return Integer value memory was set to.
3255  */
3256
3257 function wfMemoryLimit () {
3258         global $wgMemoryLimit;
3259         $memlimit = wfShorthandToInteger( ini_get( "memory_limit" ) );
3260         $conflimit = wfShorthandToInteger( $wgMemoryLimit );
3261         if( $memlimit != -1 ) {
3262                 if( $conflimit == -1 ) {
3263                         wfDebug( "Removing PHP's memory limit\n" );
3264                         wfSuppressWarnings();
3265                         ini_set( "memory_limit", $conflimit );
3266                         wfRestoreWarnings();
3267                         return $conflimit;
3268                 } elseif ( $conflimit > $memlimit ) {
3269                         wfDebug( "Raising PHP's memory limit to $conflimit bytes\n" );
3270                         wfSuppressWarnings();
3271                         ini_set( "memory_limit", $conflimit );
3272                         wfRestoreWarnings();
3273                         return $conflimit;
3274                 }
3275         }
3276         return $memlimit;
3277 }
3278
3279 /**
3280  * Converts shorthand byte notation to integer form
3281  * @param $string String
3282  * @return Integer
3283  */
3284 function wfShorthandToInteger ( $string = '' ) {
3285         $string = trim($string);
3286         if( empty($string) ) { return -1; }
3287         $last = strtolower($string[strlen($string)-1]);
3288         $val = intval($string);
3289         switch($last) {
3290                 case 'g':
3291                         $val *= 1024;
3292                 case 'm':
3293                         $val *= 1024;
3294                 case 'k':
3295                         $val *= 1024;
3296         }
3297
3298         return $val;
3299 }
3300
3301 /* Get the normalised IETF language tag
3302  * @param $code String: The language code.
3303  * @return $langCode String: The language code which complying with BCP 47 standards.
3304  */
3305 function wfBCP47( $code ) {
3306         $codeSegment = explode( '-', $code );
3307         foreach ( $codeSegment as $segNo => $seg ) {
3308                 if ( count( $codeSegment ) > 0 ) {
3309                         // ISO 3166 country code
3310                         if ( ( strlen( $seg ) == 2 ) && ( $segNo > 0 ) )
3311                                 $codeBCP[$segNo] = strtoupper( $seg );
3312                         // ISO 15924 script code
3313                         else if ( ( strlen( $seg ) == 4 ) && ( $segNo > 0 ) )
3314                                 $codeBCP[$segNo] = ucfirst( $seg );
3315                         // Use lowercase for other cases
3316                         else
3317                                 $codeBCP[$segNo] = strtolower( $seg );
3318                 } else {
3319                 // Use lowercase for single segment
3320                         $codeBCP[$segNo] = strtolower( $seg );
3321                 }
3322         }
3323         $langCode = implode ( '-' , $codeBCP );
3324         return $langCode;
3325 }