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__) . '/LogPage.php';
  12 require_once dirname(__FILE__) . '/normal/UtfNormalUtil.php';
  13 require_once dirname(__FILE__) . '/XmlFunctions.php';
  14
  15 // Hide compatibility functions from Doxygen
  16 /// @cond
  17
  18 /**
  19  * Compatibility functions
  20  *
  21  * We more or less support PHP 5.0.x and up.
  22  * Re-implementations of newer functions or functions in non-standard
  23  * PHP extensions may be included here.
  24  */
  25 if( !function_exists('iconv') ) {
  26         # iconv support is not in the default configuration and so may not be present.
  27         # Assume will only ever use utf-8 and iso-8859-1.
  28         # This will *not* work in all circumstances.
  29         function iconv( $from, $to, $string ) {
  30                 if(strcasecmp( $from, $to ) == 0) return $string;
  31                 if(strcasecmp( $from, 'utf-8' ) == 0) return utf8_decode( $string );
  32                 if(strcasecmp( $to, 'utf-8' ) == 0) return utf8_encode( $string );
  33                 return $string;
  34         }
  35 }
  36
  37 # UTF-8 substr function based on a PHP manual comment
  38 if ( !function_exists( 'mb_substr' ) ) {
  39         function mb_substr( $str, $start ) {
  40                 $ar = array();
  41                 preg_match_all( '/./us', $str, $ar );
  42
  43                 if( func_num_args() >= 3 ) {
  44                         $end = func_get_arg( 2 );
  45                         return join( '', array_slice( $ar[0], $start, $end ) );
  46                 } else {
  47                         return join( '', array_slice( $ar[0], $start ) );
  48                 }
  49         }
  50 }
  51
  52 if ( !function_exists( 'mb_strlen' ) ) {
  53         /**
  54          * Fallback implementation of mb_strlen, hardcoded to UTF-8.
  55          * @param string $str
  56          * @param string $enc optional encoding; ignored
  57          * @return int
  58          */
  59         function mb_strlen( $str, $enc="" ) {
  60                 $counts = count_chars( $str );
  61                 $total = 0;
  62
  63                 // Count ASCII bytes
  64                 for( $i = 0; $i < 0x80; $i++ ) {
  65                         $total += $counts[$i];
  66                 }
  67
  68                 // Count multibyte sequence heads
  69                 for( $i = 0xc0; $i < 0xff; $i++ ) {
  70                         $total += $counts[$i];
  71                 }
  72                 return $total;
  73         }
  74 }
  75
  76 if ( !function_exists( 'array_diff_key' ) ) {
  77         /**
  78          * Exists in PHP 5.1.0+
  79          * Not quite compatible, two-argument version only
  80          * Null values will cause problems due to this use of isset()
  81          */
  82         function array_diff_key( $left, $right ) {
  83                 $result = $left;
  84                 foreach ( $left as $key => $unused ) {
  85                         if ( isset( $right[$key] ) ) {
  86                                 unset( $result[$key] );
  87                         }
  88                 }
  89                 return $result;
  90         }
  91 }
  92
  93 /// @endcond
  94
  95
  96 /**
  97  * Like array_diff( $a, $b ) except that it works with two-dimensional arrays.
  98  */
  99 function wfArrayDiff2( $a, $b ) {
 100         return array_udiff( $a, $b, 'wfArrayDiff2_cmp' );
 101 }
 102 function wfArrayDiff2_cmp( $a, $b ) {
 103         if ( !is_array( $a ) ) {
 104                 return strcmp( $a, $b );
 105         } elseif ( count( $a ) !== count( $b ) ) {
 106                 return count( $a ) < count( $b ) ? -1 : 1;
 107         } else {
 108                 reset( $a );
 109                 reset( $b );
 110                 while( ( list( $keyA, $valueA ) = each( $a ) ) && ( list( $keyB, $valueB ) = each( $b ) ) ) {
 111                         $cmp = strcmp( $valueA, $valueB );
 112                         if ( $cmp !== 0 ) {
 113                                 return $cmp;
 114                         }
 115                 }
 116                 return 0;
 117         }
 118 }
 119
 120 /**
 121  * Wrapper for clone(), for compatibility with PHP4-friendly extensions.
 122  * PHP 5 won't let you declare a 'clone' function, even conditionally,
 123  * so it has to be a wrapper with a different name.
 124  */
 125 function wfClone( $object ) {
 126         return clone( $object );
 127 }
 128
 129 /**
 130  * Seed Mersenne Twister
 131  * No-op for compatibility; only necessary in PHP < 4.2.0
 132  */
 133 function wfSeedRandom() {
 134         /* No-op */
 135 }
 136
 137 /**
 138  * Get a random decimal value between 0 and 1, in a way
 139  * not likely to give duplicate values for any realistic
 140  * number of articles.
 141  *
 142  * @return string
 143  */
 144 function wfRandom() {
 145         # The maximum random value is "only" 2^31-1, so get two random
 146         # values to reduce the chance of dupes
 147         $max = mt_getrandmax() + 1;
 148         $rand = number_format( (mt_rand() * $max + mt_rand())
 149                 / $max / $max, 12, '.', '' );
 150         return $rand;
 151 }
 152
 153 /**
 154  * We want some things to be included as literal characters in our title URLs
 155  * for prettiness, which urlencode encodes by default.  According to RFC 1738,
 156  * all of the following should be safe:
 157  *
 158  * ;:@&=$-_.+!*'(),
 159  *
 160  * But + is not safe because it's used to indicate a space; &= are only safe in
 161  * paths and not in queries (and we don't distinguish here); ' seems kind of
 162  * scary; and urlencode() doesn't touch -_. to begin with.  Plus, although /
 163  * is reserved, we don't care.  So the list we unescape is:
 164  *
 165  * ;:@$!*(),/
 166  *
 167  * %2F in the page titles seems to fatally break for some reason.
 168  *
 169  * @param $s String:
 170  * @return string
 171 */
 172 function wfUrlencode( $s ) {
 173         $s = urlencode( $s );
 174         $s = str_ireplace(
 175                 array( '%3B','%3A','%40','%24','%21','%2A','%28','%29','%2C','%2F' ),
 176                 array(   ';',  ':',  '@',  '$',  '!',  '*',  '(',  ')',  ',',  '/' ),
 177                 $s
 178         );
 179
 180         return $s;
 181 }
 182
 183 /**
 184  * Sends a line to the debug log if enabled or, optionally, to a comment in output.
 185  * In normal operation this is a NOP.
 186  *
 187  * Controlling globals:
 188  * $wgDebugLogFile - points to the log file
 189  * $wgProfileOnly - if set, normal debug messages will not be recorded.
 190  * $wgDebugRawPage - if false, 'action=raw' hits will not result in debug output.
 191  * $wgDebugComments - if on, some debug items may appear in comments in the HTML output.
 192  *
 193  * @param $text String
 194  * @param $logonly Bool: set true to avoid appearing in HTML when $wgDebugComments is set
 195  */
 196 function wfDebug( $text, $logonly = false ) {
 197         global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly, $wgDebugRawPage;
 198         static $recursion = 0;
 199
 200         static $cache = array(); // Cache of unoutputted messages
 201
 202         # Check for raw action using $_GET not $wgRequest, since the latter might not be initialised yet
 203         if ( isset( $_GET['action'] ) && $_GET['action'] == 'raw' && !$wgDebugRawPage ) {
 204                 return;
 205         }
 206
 207         if ( $wgDebugComments && !$logonly ) {
 208                 $cache[] = $text;
 209
 210                 if ( !isset( $wgOut ) ) {
 211                         return;
 212                 }
 213                 if ( !StubObject::isRealObject( $wgOut ) ) {
 214                         if ( $recursion ) {
 215                                 return;
 216                         }
 217                         $recursion++;
 218                         $wgOut->_unstub();
 219                         $recursion--;
 220                 }
 221
 222                 // add the message and possible cached ones to the output
 223                 array_map( array( $wgOut, 'debug' ), $cache );
 224                 $cache = array();
 225         }
 226         if ( '' != $wgDebugLogFile && !$wgProfileOnly ) {
 227                 # Strip unprintables; they can switch terminal modes when binary data
 228                 # gets dumped, which is pretty annoying.
 229                 $text = preg_replace( '![\x00-\x08\x0b\x0c\x0e-\x1f]!', ' ', $text );
 230                 wfErrorLog( $text, $wgDebugLogFile );
 231         }
 232 }
 233
 234 /**
 235  * Send a line giving PHP memory usage.
 236  * @param $exact Bool : print exact values instead of kilobytes (default: false)
 237  */
 238 function wfDebugMem( $exact = false ) {
 239         $mem = memory_get_usage();
 240         if( !$exact ) {
 241                 $mem = floor( $mem / 1024 ) . ' kilobytes';
 242         } else {
 243                 $mem .= ' bytes';
 244         }
 245         wfDebug( "Memory usage: $mem\n" );
 246 }
 247
 248 /**
 249  * Send a line to a supplementary debug log file, if configured, or main debug log if not.
 250  * $wgDebugLogGroups[$logGroup] should be set to a filename to send to a separate log.
 251  *
 252  * @param $logGroup String
 253  * @param $text String
 254  * @param $public Bool: whether to log the event in the public log if no private
 255  *                     log file is specified, (default true)
 256  */
 257 function wfDebugLog( $logGroup, $text, $public = true ) {
 258         global $wgDebugLogGroups, $wgShowHostnames;
 259         if( $text{strlen( $text ) - 1} != "\n" ) $text .= "\n";
 260         if( isset( $wgDebugLogGroups[$logGroup] ) ) {
 261                 $time = wfTimestamp( TS_DB );
 262                 $wiki = wfWikiID();
 263                 if ( $wgShowHostnames ) {
 264                         $host = wfHostname();
 265                 } else {
 266                         $host = '';
 267                 }
 268                 wfErrorLog( "$time $host $wiki: $text", $wgDebugLogGroups[$logGroup] );
 269         } else if ( $public === true ) {
 270                 wfDebug( $text, true );
 271         }
 272 }
 273
 274 /**
 275  * Log for database errors
 276  * @param $text String: database error message.
 277  */
 278 function wfLogDBError( $text ) {
 279         global $wgDBerrorLog, $wgDBname;
 280         if ( $wgDBerrorLog ) {
 281                 $host = trim(`hostname`);
 282                 $text = date('D M j G:i:s T Y') . "\t$host\t$wgDBname\t$text";
 283                 wfErrorLog( $text, $wgDBerrorLog );
 284         }
 285 }
 286
 287 /**
 288  * Log to a file without getting "file size exceeded" signals.
 289  *
 290  * Can also log to TCP or UDP with the syntax udp://host:port/prefix. This will
 291  * send lines to the specified port, prefixed by the specified prefix and a space.
 292  */
 293 function wfErrorLog( $text, $file ) {
 294         if ( substr( $file, 0, 4 ) == 'udp:' ) {
 295                 if ( preg_match( '!^(tcp|udp):(?://)?\[([0-9a-fA-F:]+)\]:(\d+)(?:/(.*))?$!', $file, $m ) ) {
 296                         // IPv6 bracketed host
 297                         $protocol = $m[1];
 298                         $host = $m[2];
 299                         $port = $m[3];
 300                         $prefix = isset( $m[4] ) ? $m[4] : false;
 301                 } elseif ( preg_match( '!^(tcp|udp):(?://)?([a-zA-Z0-9.-]+):(\d+)(?:/(.*))?$!', $file, $m ) ) {
 302                         $protocol = $m[1];
 303                         $host = $m[2];
 304                         $port = $m[3];
 305                         $prefix = isset( $m[4] ) ? $m[4] : false;
 306                 } else {
 307                         throw new MWException( __METHOD__.": Invalid UDP specification" );
 308                 }
 309                 // Clean it up for the multiplexer
 310                 if ( strval( $prefix ) !== '' ) {
 311                         $text = preg_replace( '/^/m', $prefix . ' ', $text );
 312                         if ( substr( $text, -1 ) != "\n" ) {
 313                                 $text .= "\n";
 314                         }
 315                 }
 316
 317                 $sock = fsockopen( "$protocol://$host", $port );
 318                 if ( !$sock ) {
 319                         return;
 320                 }
 321                 fwrite( $sock, $text );
 322                 fclose( $sock );
 323         } else {
 324                 wfSuppressWarnings();
 325                 $exists = file_exists( $file );
 326                 $size = $exists ? filesize( $file ) : false;
 327                 if ( !$exists || ( $size !== false && $size + strlen( $text ) < 0x7fffffff ) ) {
 328                         error_log( $text, 3, $file );
 329                 }
 330                 wfRestoreWarnings();
 331         }
 332 }
 333
 334 /**
 335  * @todo document
 336  */
 337 function wfLogProfilingData() {
 338         global $wgRequestTime, $wgDebugLogFile, $wgDebugRawPage, $wgRequest;
 339         global $wgProfiler, $wgUser;
 340         if ( !isset( $wgProfiler ) )
 341                 return;
 342
 343         $now = wfTime();
 344         $elapsed = $now - $wgRequestTime;
 345         $prof = wfGetProfilingOutput( $wgRequestTime, $elapsed );
 346         $forward = '';
 347         if( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
 348                 $forward = ' forwarded for ' . $_SERVER['HTTP_X_FORWARDED_FOR'];
 349         if( !empty( $_SERVER['HTTP_CLIENT_IP'] ) )
 350                 $forward .= ' client IP ' . $_SERVER['HTTP_CLIENT_IP'];
 351         if( !empty( $_SERVER['HTTP_FROM'] ) )
 352                 $forward .= ' from ' . $_SERVER['HTTP_FROM'];
 353         if( $forward )
 354                 $forward = "\t(proxied via {$_SERVER['REMOTE_ADDR']}{$forward})";
 355         // Don't unstub $wgUser at this late stage just for statistics purposes
 356         if( StubObject::isRealObject($wgUser) && $wgUser->isAnon() )
 357                 $forward .= ' anon';
 358         $log = sprintf( "%s\t%04.3f\t%s\n",
 359           gmdate( 'YmdHis' ), $elapsed,
 360           urldecode( $wgRequest->getRequestURL() . $forward ) );
 361         if ( '' != $wgDebugLogFile && ( $wgRequest->getVal('action') != 'raw' || $wgDebugRawPage ) ) {
 362                 wfErrorLog( $log . $prof, $wgDebugLogFile );
 363         }
 364 }
 365
 366 /**
 367  * Check if the wiki read-only lock file is present. This can be used to lock
 368  * off editing functions, but doesn't guarantee that the database will not be
 369  * modified.
 370  * @return bool
 371  */
 372 function wfReadOnly() {
 373         global $wgReadOnlyFile, $wgReadOnly;
 374
 375         if ( !is_null( $wgReadOnly ) ) {
 376                 return (bool)$wgReadOnly;
 377         }
 378         if ( '' == $wgReadOnlyFile ) {
 379                 return false;
 380         }
 381         // Set $wgReadOnly for faster access next time
 382         if ( is_file( $wgReadOnlyFile ) ) {
 383                 $wgReadOnly = file_get_contents( $wgReadOnlyFile );
 384         } else {
 385                 $wgReadOnly = false;
 386         }
 387         return (bool)$wgReadOnly;
 388 }
 389
 390 function wfReadOnlyReason() {
 391         global $wgReadOnly;
 392         wfReadOnly();
 393         return $wgReadOnly;
 394 }
 395
 396 /**
 397  * Return a Language object from $langcode
 398  * @param $langcode Mixed: either:
 399  *                  - a Language object
 400  *                  - code of the language to get the message for, if it is
 401  *                    a valid code create a language for that language, if
 402  *                    it is a string but not a valid code then make a basic
 403  *                    language object
 404  *                  - a boolean: if it's false then use the current users
 405  *                    language (as a fallback for the old parameter
 406  *                    functionality), or if it is true then use the wikis
 407  * @return Language object
 408  */
 409 function wfGetLangObj( $langcode = false ){
 410         # Identify which language to get or create a language object for.
 411         if( $langcode instanceof Language )
 412                 # Great, we already have the object!
 413                 return $langcode;
 414
 415         global $wgContLang;
 416         if( $langcode === $wgContLang->getCode() || $langcode === true )
 417                 # $langcode is the language code of the wikis content language object.
 418                 # or it is a boolean and value is true
 419                 return $wgContLang;
 420
 421         global $wgLang;
 422         if( $langcode === $wgLang->getCode() || $langcode === false )
 423                 # $langcode is the language code of user language object.
 424                 # or it was a boolean and value is false
 425                 return $wgLang;
 426
 427         $validCodes = array_keys( Language::getLanguageNames() );
 428         if( in_array( $langcode, $validCodes ) )
 429                 # $langcode corresponds to a valid language.
 430                 return Language::factory( $langcode );
 431
 432         # $langcode is a string, but not a valid language code; use content language.
 433         wfDebug( 'Invalid language code passed to wfGetLangObj, falling back to content language.' );
 434         return $wgContLang;
 435 }
 436
 437 /**
 438  * Get a message from anywhere, for the current user language.
 439  *
 440  * Use wfMsgForContent() instead if the message should NOT
 441  * change depending on the user preferences.
 442  *
 443  * @param $key String: lookup key for the message, usually
 444  *    defined in languages/Language.php
 445  *
 446  * This function also takes extra optional parameters (not
 447  * shown in the function definition), which can by used to
 448  * insert variable text into the predefined message.
 449  */
 450 function wfMsg( $key ) {
 451         $args = func_get_args();
 452         array_shift( $args );
 453         return wfMsgReal( $key, $args, true );
 454 }
 455
 456 /**
 457  * Same as above except doesn't transform the message
 458  */
 459 function wfMsgNoTrans( $key ) {
 460         $args = func_get_args();
 461         array_shift( $args );
 462         return wfMsgReal( $key, $args, true, false, false );
 463 }
 464
 465 /**
 466  * Get a message from anywhere, for the current global language
 467  * set with $wgLanguageCode.
 468  *
 469  * Use this if the message should NOT change  dependent on the
 470  * language set in the user's preferences. This is the case for
 471  * most text written into logs, as well as link targets (such as
 472  * the name of the copyright policy page). Link titles, on the
 473  * other hand, should be shown in the UI language.
 474  *
 475  * Note that MediaWiki allows users to change the user interface
 476  * language in their preferences, but a single installation
 477  * typically only contains content in one language.
 478  *
 479  * Be wary of this distinction: If you use wfMsg() where you should
 480  * use wfMsgForContent(), a user of the software may have to
 481  * customize over 70 messages in order to, e.g., fix a link in every
 482  * possible language.
 483  *
 484  * @param $key String: lookup key for the message, usually
 485  *    defined in languages/Language.php
 486  */
 487 function wfMsgForContent( $key ) {
 488         global $wgForceUIMsgAsContentMsg;
 489         $args = func_get_args();
 490         array_shift( $args );
 491         $forcontent = true;
 492         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 493                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 494                 $forcontent = false;
 495         return wfMsgReal( $key, $args, true, $forcontent );
 496 }
 497
 498 /**
 499  * Same as above except doesn't transform the message
 500  */
 501 function wfMsgForContentNoTrans( $key ) {
 502         global $wgForceUIMsgAsContentMsg;
 503         $args = func_get_args();
 504         array_shift( $args );
 505         $forcontent = true;
 506         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 507                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 508                 $forcontent = false;
 509         return wfMsgReal( $key, $args, true, $forcontent, false );
 510 }
 511
 512 /**
 513  * Get a message from the language file, for the UI elements
 514  */
 515 function wfMsgNoDB( $key ) {
 516         $args = func_get_args();
 517         array_shift( $args );
 518         return wfMsgReal( $key, $args, false );
 519 }
 520
 521 /**
 522  * Get a message from the language file, for the content
 523  */
 524 function wfMsgNoDBForContent( $key ) {
 525         global $wgForceUIMsgAsContentMsg;
 526         $args = func_get_args();
 527         array_shift( $args );
 528         $forcontent = true;
 529         if( is_array( $wgForceUIMsgAsContentMsg ) &&
 530                 in_array( $key, $wgForceUIMsgAsContentMsg ) )
 531                 $forcontent = false;
 532         return wfMsgReal( $key, $args, false, $forcontent );
 533 }
 534
 535
 536 /**
 537  * Really get a message
 538  * @param $key String: key to get.
 539  * @param $args
 540  * @param $useDB Boolean
 541  * @param $transform Boolean: Whether or not to transform the message.
 542  * @param $forContent Boolean
 543  * @return String: the requested message.
 544  */
 545 function wfMsgReal( $key, $args, $useDB = true, $forContent=false, $transform = true ) {
 546         wfProfileIn( __METHOD__ );
 547         $message = wfMsgGetKey( $key, $useDB, $forContent, $transform );
 548         $message = wfMsgReplaceArgs( $message, $args );
 549         wfProfileOut( __METHOD__ );
 550         return $message;
 551 }
 552
 553 /**
 554  * This function provides the message source for messages to be edited which are *not* stored in the database.
 555  * @param $key String:
 556  */
 557 function wfMsgWeirdKey ( $key ) {
 558         $source = wfMsgGetKey( $key, false, true, false );
 559         if ( wfEmptyMsg( $key, $source ) )
 560                 return "";
 561         else
 562                 return $source;
 563 }
 564
 565 /**
 566  * Fetch a message string value, but don't replace any keys yet.
 567  * @param string $key
 568  * @param bool $useDB
 569  * @param string $langcode Code of the language to get the message for, or
 570  *                         behaves as a content language switch if it is a
 571  *                         boolean.
 572  * @return string
 573  * @private
 574  */
 575 function wfMsgGetKey( $key, $useDB, $langCode = false, $transform = true ) {
 576         global $wgContLang, $wgMessageCache;
 577
 578         wfRunHooks('NormalizeMessageKey', array(&$key, &$useDB, &$langCode, &$transform));
 579
 580         # If $wgMessageCache isn't initialised yet, try to return something sensible.
 581         if( is_object( $wgMessageCache ) ) {
 582                 $message = $wgMessageCache->get( $key, $useDB, $langCode );
 583                 if ( $transform ) {
 584                         $message = $wgMessageCache->transform( $message );
 585                 }
 586         } else {
 587                 $lang = wfGetLangObj( $langCode );
 588
 589                 # MessageCache::get() does this already, Language::getMessage() doesn't
 590                 # ISSUE: Should we try to handle "message/lang" here too?
 591                 $key = str_replace( ' ' , '_' , $wgContLang->lcfirst( $key ) );
 592
 593                 if( is_object( $lang ) ) {
 594                         $message = $lang->getMessage( $key );
 595                 } else {
 596                         $message = false;
 597                 }
 598         }
 599
 600         return $message;
 601 }
 602
 603 /**
 604  * Replace message parameter keys on the given formatted output.
 605  *
 606  * @param string $message
 607  * @param array $args
 608  * @return string
 609  * @private
 610  */
 611 function wfMsgReplaceArgs( $message, $args ) {
 612         # Fix windows line-endings
 613         # Some messages are split with explode("\n", $msg)
 614         $message = str_replace( "\r", '', $message );
 615
 616         // Replace arguments
 617         if ( count( $args ) ) {
 618                 if ( is_array( $args[0] ) ) {
 619                         $args = array_values( $args[0] );
 620                 }
 621                 $replacementKeys = array();
 622                 foreach( $args as $n => $param ) {
 623                         $replacementKeys['$' . ($n + 1)] = $param;
 624                 }
 625                 $message = strtr( $message, $replacementKeys );
 626         }
 627
 628         return $message;
 629 }
 630
 631 /**
 632  * Return an HTML-escaped version of a message.
 633  * Parameter replacements, if any, are done *after* the HTML-escaping,
 634  * so parameters may contain HTML (eg links or form controls). Be sure
 635  * to pre-escape them if you really do want plaintext, or just wrap
 636  * the whole thing in htmlspecialchars().
 637  *
 638  * @param string $key
 639  * @param string ... parameters
 640  * @return string
 641  */
 642 function wfMsgHtml( $key ) {
 643         $args = func_get_args();
 644         array_shift( $args );
 645         return wfMsgReplaceArgs( htmlspecialchars( wfMsgGetKey( $key, true ) ), $args );
 646 }
 647
 648 /**
 649  * Return an HTML version of message
 650  * Parameter replacements, if any, are done *after* parsing the wiki-text message,
 651  * so parameters may contain HTML (eg links or form controls). Be sure
 652  * to pre-escape them if you really do want plaintext, or just wrap
 653  * the whole thing in htmlspecialchars().
 654  *
 655  * @param string $key
 656  * @param string ... parameters
 657  * @return string
 658  */
 659 function wfMsgWikiHtml( $key ) {
 660         global $wgOut;
 661         $args = func_get_args();
 662         array_shift( $args );
 663         return wfMsgReplaceArgs( $wgOut->parse( wfMsgGetKey( $key, true ), /* can't be set to false */ true ), $args );
 664 }
 665
 666 /**
 667  * Returns message in the requested format
 668  * @param string $key Key of the message
 669  * @param array $options Processing rules.  Can take the following options:
 670  *   <i>parse</i>: parses wikitext to html
 671  *   <i>parseinline</i>: parses wikitext to html and removes the surrounding
 672  *       p's added by parser or tidy
 673  *   <i>escape</i>: filters message through htmlspecialchars
 674  *   <i>escapenoentities</i>: same, but allows entity references like &nbsp; through
 675  *   <i>replaceafter</i>: parameters are substituted after parsing or escaping
 676  *   <i>parsemag</i>: transform the message using magic phrases
 677  *   <i>content</i>: fetch message for content language instead of interface
 678  * Also can accept a single associative argument, of the form 'language' => 'xx':
 679  *   <i>language</i>: Language object or language code to fetch message for
 680  *       (overriden by <i>content</i>), its behaviour with parser, parseinline
 681  *       and parsemag is undefined.
 682  * Behavior for conflicting options (e.g., parse+parseinline) is undefined.
 683  */
 684 function wfMsgExt( $key, $options ) {
 685         global $wgOut, $wgParser;
 686
 687         $args = func_get_args();
 688         array_shift( $args );
 689         array_shift( $args );
 690         $options = (array)$options;
 691
 692         foreach( $options as $arrayKey => $option ) {
 693                 if( !preg_match( '/^[0-9]+|language$/', $arrayKey ) ) {
 694                         # An unknown index, neither numeric nor "language"
 695                         trigger_error( "wfMsgExt called with incorrect parameter key $arrayKey", E_USER_WARNING );
 696                 } elseif( preg_match( '/^[0-9]+$/', $arrayKey ) && !in_array( $option,
 697                 array( 'parse', 'parseinline', 'escape', 'escapenoentities',
 698                 'replaceafter', 'parsemag', 'content' ) ) ) {
 699                         # A numeric index with unknown value
 700                         trigger_error( "wfMsgExt called with incorrect parameter $option", E_USER_WARNING );
 701                 }
 702         }
 703
 704         if( in_array('content', $options) ) {
 705                 $forContent = true;
 706                 $langCode = true;
 707         } elseif( array_key_exists('language', $options) ) {
 708                 $forContent = false;
 709                 $langCode = wfGetLangObj( $options['language'] );
 710         } else {
 711                 $forContent = false;
 712                 $langCode = false;
 713         }
 714
 715         $string = wfMsgGetKey( $key, /*DB*/true, $langCode, /*Transform*/false );
 716
 717         if( !in_array('replaceafter', $options) ) {
 718                 $string = wfMsgReplaceArgs( $string, $args );
 719         }
 720
 721         if( in_array('parse', $options) ) {
 722                 $string = $wgOut->parse( $string, true, !$forContent );
 723         } elseif ( in_array('parseinline', $options) ) {
 724                 $string = $wgOut->parse( $string, true, !$forContent );
 725                 $m = array();
 726                 if( preg_match( '/^<p>(.*)\n?<\/p>\n?$/sU', $string, $m ) ) {
 727                         $string = $m[1];
 728                 }
 729         } elseif ( in_array('parsemag', $options) ) {
 730                 global $wgMessageCache;
 731                 if ( isset( $wgMessageCache ) ) {
 732                         $string = $wgMessageCache->transform( $string, !$forContent );
 733                 }
 734         }
 735
 736         if ( in_array('escape', $options) ) {
 737                 $string = htmlspecialchars ( $string );
 738         } elseif ( in_array( 'escapenoentities', $options ) ) {
 739                 $string = Sanitizer::escapeHtmlAllowEntities( $string );
 740         }
 741
 742         if( in_array('replaceafter', $options) ) {
 743                 $string = wfMsgReplaceArgs( $string, $args );
 744         }
 745
 746         return $string;
 747 }
 748
 749
 750 /**
 751  * Just like exit() but makes a note of it.
 752  * Commits open transactions except if the error parameter is set
 753  *
 754  * @deprecated Please return control to the caller or throw an exception
 755  */
 756 function wfAbruptExit( $error = false ){
 757         static $called = false;
 758         if ( $called ){
 759                 exit( -1 );
 760         }
 761         $called = true;
 762
 763         $bt = wfDebugBacktrace();
 764         if( $bt ) {
 765                 for($i = 0; $i < count($bt) ; $i++){
 766                         $file = isset($bt[$i]['file']) ? $bt[$i]['file'] : "unknown";
 767                         $line = isset($bt[$i]['line']) ? $bt[$i]['line'] : "unknown";
 768                         wfDebug("WARNING: Abrupt exit in $file at line $line\n");
 769                 }
 770         } else {
 771                 wfDebug('WARNING: Abrupt exit\n');
 772         }
 773
 774         wfLogProfilingData();
 775
 776         if ( !$error ) {
 777                 wfGetLB()->closeAll();
 778         }
 779         exit( -1 );
 780 }
 781
 782 /**
 783  * @deprecated Please return control the caller or throw an exception
 784  */
 785 function wfErrorExit() {
 786         wfAbruptExit( true );
 787 }
 788
 789 /**
 790  * Print a simple message and die, returning nonzero to the shell if any.
 791  * Plain die() fails to return nonzero to the shell if you pass a string.
 792  * @param string $msg
 793  */
 794 function wfDie( $msg='' ) {
 795         echo $msg;
 796         die( 1 );
 797 }
 798
 799 /**
 800  * Throw a debugging exception. This function previously once exited the process,
 801  * but now throws an exception instead, with similar results.
 802  *
 803  * @param string $msg Message shown when dieing.
 804  */
 805 function wfDebugDieBacktrace( $msg = '' ) {
 806         throw new MWException( $msg );
 807 }
 808
 809 /**
 810  * Fetch server name for use in error reporting etc.
 811  * Use real server name if available, so we know which machine
 812  * in a server farm generated the current page.
 813  * @return string
 814  */
 815 function wfHostname() {
 816         static $host;
 817         if ( is_null( $host ) ) {
 818                 if ( function_exists( 'posix_uname' ) ) {
 819                         // This function not present on Windows
 820                         $uname = @posix_uname();
 821                 } else {
 822                         $uname = false;
 823                 }
 824                 if( is_array( $uname ) && isset( $uname['nodename'] ) ) {
 825                         $host = $uname['nodename'];
 826                 } elseif ( getenv( 'COMPUTERNAME' ) ) {
 827                         # Windows computer name
 828                         $host = getenv( 'COMPUTERNAME' );
 829                 } else {
 830                         # This may be a virtual server.
 831                         $host = $_SERVER['SERVER_NAME'];
 832                 }
 833         }
 834         return $host;
 835 }
 836
 837         /**
 838          * Returns a HTML comment with the elapsed time since request.
 839          * This method has no side effects.
 840          * @return string
 841          */
 842         function wfReportTime() {
 843                 global $wgRequestTime, $wgShowHostnames;
 844
 845                 $now = wfTime();
 846                 $elapsed = $now - $wgRequestTime;
 847
 848                 return $wgShowHostnames
 849                         ? sprintf( "<!-- Served by %s in %01.3f secs. -->", wfHostname(), $elapsed )
 850                         : sprintf( "<!-- Served in %01.3f secs. -->", $elapsed );
 851         }
 852
 853 /**
 854  * Safety wrapper for debug_backtrace().
 855  *
 856  * With Zend Optimizer 3.2.0 loaded, this causes segfaults under somewhat
 857  * murky circumstances, which may be triggered in part by stub objects
 858  * or other fancy talkin'.
 859  *
 860  * Will return an empty array if Zend Optimizer is detected, otherwise
 861  * the output from debug_backtrace() (trimmed).
 862  *
 863  * @return array of backtrace information
 864  */
 865 function wfDebugBacktrace() {
 866         if( extension_loaded( 'Zend Optimizer' ) ) {
 867                 wfDebug( "Zend Optimizer detected; skipping debug_backtrace for safety.\n" );
 868                 return array();
 869         } else {
 870                 return array_slice( debug_backtrace(), 1 );
 871         }
 872 }
 873
 874 function wfBacktrace() {
 875         global $wgCommandLineMode;
 876
 877         if ( $wgCommandLineMode ) {
 878                 $msg = '';
 879         } else {
 880                 $msg = "<ul>\n";
 881         }
 882         $backtrace = wfDebugBacktrace();
 883         foreach( $backtrace as $call ) {
 884                 if( isset( $call['file'] ) ) {
 885                         $f = explode( DIRECTORY_SEPARATOR, $call['file'] );
 886                         $file = $f[count($f)-1];
 887                 } else {
 888                         $file = '-';
 889                 }
 890                 if( isset( $call['line'] ) ) {
 891                         $line = $call['line'];
 892                 } else {
 893                         $line = '-';
 894                 }
 895                 if ( $wgCommandLineMode ) {
 896                         $msg .= "$file line $line calls ";
 897                 } else {
 898                         $msg .= '<li>' . $file . ' line ' . $line . ' calls ';
 899                 }
 900                 if( !empty( $call['class'] ) ) $msg .= $call['class'] . '::';
 901                 $msg .= $call['function'] . '()';
 902
 903                 if ( $wgCommandLineMode ) {
 904                         $msg .= "\n";
 905                 } else {
 906                         $msg .= "</li>\n";
 907                 }
 908         }
 909         if ( $wgCommandLineMode ) {
 910                 $msg .= "\n";
 911         } else {
 912                 $msg .= "</ul>\n";
 913         }
 914
 915         return $msg;
 916 }
 917
 918
 919 /* Some generic result counters, pulled out of SearchEngine */
 920
 921
 922 /**
 923  * @todo document
 924  */
 925 function wfShowingResults( $offset, $limit ) {
 926         global $wgLang;
 927         return wfMsgExt( 'showingresults', array( 'parseinline' ), $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ) );
 928 }
 929
 930 /**
 931  * @todo document
 932  */
 933 function wfShowingResultsNum( $offset, $limit, $num ) {
 934         global $wgLang;
 935         return wfMsgExt( 'showingresultsnum', array( 'parseinline' ), $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ), $wgLang->formatNum( $num ) );
 936 }
 937
 938 /**
 939  * @todo document
 940  */
 941 function wfViewPrevNext( $offset, $limit, $link, $query = '', $atend = false ) {
 942         global $wgLang;
 943         $fmtLimit = $wgLang->formatNum( $limit );
 944         $prev = wfMsg( 'prevn', $fmtLimit );
 945         $next = wfMsg( 'nextn', $fmtLimit );
 946
 947         if( is_object( $link ) ) {
 948                 $title =& $link;
 949         } else {
 950                 $title = Title::newFromText( $link );
 951                 if( is_null( $title ) ) {
 952                         return false;
 953                 }
 954         }
 955
 956         if ( 0 != $offset ) {
 957                 $po = $offset - $limit;
 958                 if ( $po < 0 ) { $po = 0; }
 959                 $q = "limit={$limit}&offset={$po}";
 960                 if ( '' != $query ) { $q .= '&'.$query; }
 961                 $plink = '<a href="' . $title->escapeLocalUrl( $q ) . "\" class=\"mw-prevlink\">{$prev}</a>";
 962         } else { $plink = $prev; }
 963
 964         $no = $offset + $limit;
 965         $q = 'limit='.$limit.'&offset='.$no;
 966         if ( '' != $query ) { $q .= '&'.$query; }
 967
 968         if ( $atend ) {
 969                 $nlink = $next;
 970         } else {
 971                 $nlink = '<a href="' . $title->escapeLocalUrl( $q ) . "\" class=\"mw-nextlink\">{$next}</a>";
 972         }
 973         $nums = wfNumLink( $offset, 20, $title, $query ) . ' | ' .
 974           wfNumLink( $offset, 50, $title, $query ) . ' | ' .
 975           wfNumLink( $offset, 100, $title, $query ) . ' | ' .
 976           wfNumLink( $offset, 250, $title, $query ) . ' | ' .
 977           wfNumLink( $offset, 500, $title, $query );
 978
 979         return wfMsg( 'viewprevnext', $plink, $nlink, $nums );
 980 }
 981
 982 /**
 983  * @todo document
 984  */
 985 function wfNumLink( $offset, $limit, &$title, $query = '' ) {
 986         global $wgLang;
 987         if ( '' == $query ) { $q = ''; }
 988         else { $q = $query.'&'; }
 989         $q .= 'limit='.$limit.'&offset='.$offset;
 990
 991         $fmtLimit = $wgLang->formatNum( $limit );
 992         $s = '<a href="' . $title->escapeLocalUrl( $q ) . "\" class=\"mw-numlink\">{$fmtLimit}</a>";
 993         return $s;
 994 }
 995
 996 /**
 997  * @todo document
 998  * @todo FIXME: we may want to blacklist some broken browsers
 999  *
1000  * @return bool Whereas client accept gzip compression
1001  */
1002 function wfClientAcceptsGzip() {
1003         global $wgUseGzip;
1004         if( $wgUseGzip ) {
1005                 # FIXME: we may want to blacklist some broken browsers
1006                 $m = array();
1007                 if( preg_match(
1008                         '/\bgzip(?:;(q)=([0-9]+(?:\.[0-9]+)))?\b/',
1009                         $_SERVER['HTTP_ACCEPT_ENCODING'],
1010                         $m ) ) {
1011                         if( isset( $m[2] ) && ( $m[1] == 'q' ) && ( $m[2] == 0 ) ) return false;
1012                         wfDebug( " accepts gzip\n" );
1013                         return true;
1014                 }
1015         }
1016         return false;
1017 }
1018
1019 /**
1020  * Obtain the offset and limit values from the request string;
1021  * used in special pages
1022  *
1023  * @param $deflimit Default limit if none supplied
1024  * @param $optionname Name of a user preference to check against
1025  * @return array
1026  *
1027  */
1028 function wfCheckLimits( $deflimit = 50, $optionname = 'rclimit' ) {
1029         global $wgRequest;
1030         return $wgRequest->getLimitOffset( $deflimit, $optionname );
1031 }
1032
1033 /**
1034  * Escapes the given text so that it may be output using addWikiText()
1035  * without any linking, formatting, etc. making its way through. This
1036  * is achieved by substituting certain characters with HTML entities.
1037  * As required by the callers, <nowiki> is not used. It currently does
1038  * not filter out characters which have special meaning only at the
1039  * start of a line, such as "*".
1040  *
1041  * @param string $text Text to be escaped
1042  */
1043 function wfEscapeWikiText( $text ) {
1044         $text = str_replace(
1045                 array( '[',     '|',      ']',     '\'',    'ISBN ',     'RFC ',     '://',     "\n=",     '{{' ),
1046                 array( '&#91;', '&#124;', '&#93;', '&#39;', 'ISBN&#32;', 'RFC&#32;', '&#58;//', "\n&#61;", '&#123;&#123;' ),
1047                 htmlspecialchars($text) );
1048         return $text;
1049 }
1050
1051 /**
1052  * @todo document
1053  */
1054 function wfQuotedPrintable( $string, $charset = '' ) {
1055         # Probably incomplete; see RFC 2045
1056         if( empty( $charset ) ) {
1057                 global $wgInputEncoding;
1058                 $charset = $wgInputEncoding;
1059         }
1060         $charset = strtoupper( $charset );
1061         $charset = str_replace( 'ISO-8859', 'ISO8859', $charset ); // ?
1062
1063         $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
1064         $replace = $illegal . '\t ?_';
1065         if( !preg_match( "/[$illegal]/", $string ) ) return $string;
1066         $out = "=?$charset?Q?";
1067         $out .= preg_replace( "/([$replace])/e", 'sprintf("=%02X",ord("$1"))', $string );
1068         $out .= '?=';
1069         return $out;
1070 }
1071
1072
1073 /**
1074  * @todo document
1075  * @return float
1076  */
1077 function wfTime() {
1078         return microtime(true);
1079 }
1080
1081 /**
1082  * Sets dest to source and returns the original value of dest
1083  * If source is NULL, it just returns the value, it doesn't set the variable
1084  */
1085 function wfSetVar( &$dest, $source ) {
1086         $temp = $dest;
1087         if ( !is_null( $source ) ) {
1088                 $dest = $source;
1089         }
1090         return $temp;
1091 }
1092
1093 /**
1094  * As for wfSetVar except setting a bit
1095  */
1096 function wfSetBit( &$dest, $bit, $state = true ) {
1097         $temp = (bool)($dest & $bit );
1098         if ( !is_null( $state ) ) {
1099                 if ( $state ) {
1100                         $dest |= $bit;
1101                 } else {
1102                         $dest &= ~$bit;
1103                 }
1104         }
1105         return $temp;
1106 }
1107
1108 /**
1109  * This function takes two arrays as input, and returns a CGI-style string, e.g.
1110  * "days=7&limit=100". Options in the first array override options in the second.
1111  * Options set to "" will not be output.
1112  */
1113 function wfArrayToCGI( $array1, $array2 = NULL )
1114 {
1115         if ( !is_null( $array2 ) ) {
1116                 $array1 = $array1 + $array2;
1117         }
1118
1119         $cgi = '';
1120         foreach ( $array1 as $key => $value ) {
1121                 if ( '' !== $value ) {
1122                         if ( '' != $cgi ) {
1123                                 $cgi .= '&';
1124                         }
1125                         if(is_array($value))
1126                         {
1127                                 $firstTime = true;
1128                                 foreach($value as $v)
1129                                 {
1130                                         $cgi .= ($firstTime ? '' : '&') .
1131                                                 urlencode( $key . '[]' ) . '=' .
1132                                                 urlencode( $v );
1133                                         $firstTime = false;
1134                                 }
1135                         }
1136                         else
1137                                 $cgi .= urlencode( $key ) . '=' .
1138                                         urlencode( $value );
1139                 }
1140         }
1141         return $cgi;
1142 }
1143
1144 /**
1145  * This is the logical opposite of wfArrayToCGI(): it accepts a query string as
1146  * its argument and returns the same string in array form.  This allows compa-
1147  * tibility with legacy functions that accept raw query strings instead of nice
1148  * arrays.  Of course, keys and values are urldecode()d.  Don't try passing in-
1149  * valid query strings, or it will explode.
1150  *
1151  * @param $query string Query string
1152  * @return array Array version of input
1153  */
1154 function wfCgiToArray( $query ) {
1155         if( isset( $query[0] ) and $query[0] == '?' ) {
1156                 $query = substr( $query, 1 );
1157         }
1158         $bits = explode( '&', $query );
1159         $ret = array();
1160         foreach( $bits as $bit ) {
1161                 if( $bit === '' ) {
1162                         continue;
1163                 }
1164                 list( $key, $value ) = explode( '=', $bit );
1165                 $key = urldecode( $key );
1166                 $value = urldecode( $value );
1167                 $ret[$key] = $value;
1168         }
1169         return $ret;
1170 }
1171
1172 /**
1173  * Append a query string to an existing URL, which may or may not already
1174  * have query string parameters already. If so, they will be combined.
1175  *
1176  * @param string $url
1177  * @param string $query
1178  * @return string
1179  */
1180 function wfAppendQuery( $url, $query ) {
1181         if( $query != '' ) {
1182                 if( false === strpos( $url, '?' ) ) {
1183                         $url .= '?';
1184                 } else {
1185                         $url .= '&';
1186                 }
1187                 $url .= $query;
1188         }
1189         return $url;
1190 }
1191
1192 /**
1193  * Expand a potentially local URL to a fully-qualified URL.
1194  * Assumes $wgServer is correct. :)
1195  * @param string $url, either fully-qualified or a local path + query
1196  * @return string Fully-qualified URL
1197  */
1198 function wfExpandUrl( $url ) {
1199         if( substr( $url, 0, 1 ) == '/' ) {
1200                 global $wgServer;
1201                 return $wgServer . $url;
1202         } else {
1203                 return $url;
1204         }
1205 }
1206
1207 /**
1208  * This is obsolete, use SquidUpdate::purge()
1209  * @deprecated
1210  */
1211 function wfPurgeSquidServers ($urlArr) {
1212         SquidUpdate::purge( $urlArr );
1213 }
1214
1215 /**
1216  * Windows-compatible version of escapeshellarg()
1217  * Windows doesn't recognise single-quotes in the shell, but the escapeshellarg()
1218  * function puts single quotes in regardless of OS.
1219  *
1220  * Also fixes the locale problems on Linux in PHP 5.2.6+ (bug backported to
1221  * earlier distro releases of PHP)
1222  */
1223 function wfEscapeShellArg( ) {
1224         wfInitShellLocale();
1225
1226         $args = func_get_args();
1227         $first = true;
1228         $retVal = '';
1229         foreach ( $args as $arg ) {
1230                 if ( !$first ) {
1231                         $retVal .= ' ';
1232                 } else {
1233                         $first = false;
1234                 }
1235
1236                 if ( wfIsWindows() ) {
1237                         // Escaping for an MSVC-style command line parser
1238                         // Ref: http://mailman.lyra.org/pipermail/scite-interest/2002-March/000436.html
1239                         // Double the backslashes before any double quotes. Escape the double quotes.
1240                         $tokens = preg_split( '/(\\\\*")/', $arg, -1, PREG_SPLIT_DELIM_CAPTURE );
1241                         $arg = '';
1242                         $delim = false;
1243                         foreach ( $tokens as $token ) {
1244                                 if ( $delim ) {
1245                                         $arg .= str_replace( '\\', '\\\\', substr( $token, 0, -1 ) ) . '\\"';
1246                                 } else {
1247                                         $arg .= $token;
1248                                 }
1249                                 $delim = !$delim;
1250                         }
1251                         // Double the backslashes before the end of the string, because
1252                         // we will soon add a quote
1253                         $m = array();
1254                         if ( preg_match( '/^(.*?)(\\\\+)$/', $arg, $m ) ) {
1255                                 $arg = $m[1] . str_replace( '\\', '\\\\', $m[2] );
1256                         }
1257
1258                         // Add surrounding quotes
1259                         $retVal .= '"' . $arg . '"';
1260                 } else {
1261                         $retVal .= escapeshellarg( $arg );
1262                 }
1263         }
1264         return $retVal;
1265 }
1266
1267 /**
1268  * wfMerge attempts to merge differences between three texts.
1269  * Returns true for a clean merge and false for failure or a conflict.
1270  */
1271 function wfMerge( $old, $mine, $yours, &$result ){
1272         global $wgDiff3;
1273
1274         # This check may also protect against code injection in
1275         # case of broken installations.
1276         if( !$wgDiff3 || !file_exists( $wgDiff3 ) ) {
1277                 wfDebug( "diff3 not found\n" );
1278                 return false;
1279         }
1280
1281         # Make temporary files
1282         $td = wfTempDir();
1283         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
1284         $mytextFile = fopen( $mytextName = tempnam( $td, 'merge-mine-' ), 'w' );
1285         $yourtextFile = fopen( $yourtextName = tempnam( $td, 'merge-your-' ), 'w' );
1286
1287         fwrite( $oldtextFile, $old ); fclose( $oldtextFile );
1288         fwrite( $mytextFile, $mine ); fclose( $mytextFile );
1289         fwrite( $yourtextFile, $yours ); fclose( $yourtextFile );
1290
1291         # Check for a conflict
1292         $cmd = $wgDiff3 . ' -a --overlap-only ' .
1293           wfEscapeShellArg( $mytextName ) . ' ' .
1294           wfEscapeShellArg( $oldtextName ) . ' ' .
1295           wfEscapeShellArg( $yourtextName );
1296         $handle = popen( $cmd, 'r' );
1297
1298         if( fgets( $handle, 1024 ) ){
1299                 $conflict = true;
1300         } else {
1301                 $conflict = false;
1302         }
1303         pclose( $handle );
1304
1305         # Merge differences
1306         $cmd = $wgDiff3 . ' -a -e --merge ' .
1307           wfEscapeShellArg( $mytextName, $oldtextName, $yourtextName );
1308         $handle = popen( $cmd, 'r' );
1309         $result = '';
1310         do {
1311                 $data = fread( $handle, 8192 );
1312                 if ( strlen( $data ) == 0 ) {
1313                         break;
1314                 }
1315                 $result .= $data;
1316         } while ( true );
1317         pclose( $handle );
1318         unlink( $mytextName ); unlink( $oldtextName ); unlink( $yourtextName );
1319
1320         if ( $result === '' && $old !== '' && $conflict == false ) {
1321                 wfDebug( "Unexpected null result from diff3. Command: $cmd\n" );
1322                 $conflict = true;
1323         }
1324         return ! $conflict;
1325 }
1326
1327 /**
1328  * Returns unified plain-text diff of two texts.
1329  * Useful for machine processing of diffs.
1330  * @param $before string The text before the changes.
1331  * @param $after string The text after the changes.
1332  * @param $params string Command-line options for the diff command.
1333  * @return string Unified diff of $before and $after
1334  */
1335 function wfDiff( $before, $after, $params = '-u' ) {
1336         global $wgDiff;
1337
1338         # This check may also protect against code injection in
1339         # case of broken installations.
1340         if( !file_exists( $wgDiff ) ){
1341                 wfDebug( "diff executable not found\n" );
1342                 $diffs = new Diff( explode( "\n", $before ), explode( "\n", $after ) );
1343                 $format = new UnifiedDiffFormatter();
1344                 return $format->format( $diffs );
1345         }
1346
1347         # Make temporary files
1348         $td = wfTempDir();
1349         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
1350         $newtextFile = fopen( $newtextName = tempnam( $td, 'merge-your-' ), 'w' );
1351
1352         fwrite( $oldtextFile, $before ); fclose( $oldtextFile );
1353         fwrite( $newtextFile, $after ); fclose( $newtextFile );
1354
1355         // Get the diff of the two files
1356         $cmd = "$wgDiff " . $params . ' ' .wfEscapeShellArg( $oldtextName, $newtextName );
1357
1358         $h = popen( $cmd, 'r' );
1359
1360         $diff = '';
1361
1362         do {
1363                 $data = fread( $h, 8192 );
1364                 if ( strlen( $data ) == 0 ) {
1365                         break;
1366                 }
1367                 $diff .= $data;
1368         } while ( true );
1369
1370         // Clean up
1371         pclose( $h );
1372         unlink( $oldtextName );
1373         unlink( $newtextName );
1374
1375         // Kill the --- and +++ lines. They're not useful.
1376         $diff_lines = explode( "\n", $diff );
1377         if (strpos( $diff_lines[0], '---' ) === 0) {
1378                 unset($diff_lines[0]);
1379         }
1380         if (strpos( $diff_lines[1], '+++' ) === 0) {
1381                 unset($diff_lines[1]);
1382         }
1383
1384         $diff = implode( "\n", $diff_lines );
1385
1386         return $diff;
1387 }
1388
1389 /**
1390  * @todo document
1391  */
1392 function wfVarDump( $var ) {
1393         global $wgOut;
1394         $s = str_replace("\n","<br />\n", var_export( $var, true ) . "\n");
1395         if ( headers_sent() || !@is_object( $wgOut ) ) {
1396                 print $s;
1397         } else {
1398                 $wgOut->addHTML( $s );
1399         }
1400 }
1401
1402 /**
1403  * Provide a simple HTTP error.
1404  */
1405 function wfHttpError( $code, $label, $desc ) {
1406         global $wgOut;
1407         $wgOut->disable();
1408         header( "HTTP/1.0 $code $label" );
1409         header( "Status: $code $label" );
1410         $wgOut->sendCacheControl();
1411
1412         header( 'Content-type: text/html; charset=utf-8' );
1413         print "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">".
1414                 "<html><head><title>" .
1415                 htmlspecialchars( $label ) .
1416                 "</title></head><body><h1>" .
1417                 htmlspecialchars( $label ) .
1418                 "</h1><p>" .
1419                 nl2br( htmlspecialchars( $desc ) ) .
1420                 "</p></body></html>\n";
1421 }
1422
1423 /**
1424  * Clear away any user-level output buffers, discarding contents.
1425  *
1426  * Suitable for 'starting afresh', for instance when streaming
1427  * relatively large amounts of data without buffering, or wanting to
1428  * output image files without ob_gzhandler's compression.
1429  *
1430  * The optional $resetGzipEncoding parameter controls suppression of
1431  * the Content-Encoding header sent by ob_gzhandler; by default it
1432  * is left. See comments for wfClearOutputBuffers() for why it would
1433  * be used.
1434  *
1435  * Note that some PHP configuration options may add output buffer
1436  * layers which cannot be removed; these are left in place.
1437  *
1438  * @param bool $resetGzipEncoding
1439  */
1440 function wfResetOutputBuffers( $resetGzipEncoding=true ) {
1441         if( $resetGzipEncoding ) {
1442                 // Suppress Content-Encoding and Content-Length
1443                 // headers from 1.10+s wfOutputHandler
1444                 global $wgDisableOutputCompression;
1445                 $wgDisableOutputCompression = true;
1446         }
1447         while( $status = ob_get_status() ) {
1448                 if( $status['type'] == 0 /* PHP_OUTPUT_HANDLER_INTERNAL */ ) {
1449                         // Probably from zlib.output_compression or other
1450                         // PHP-internal setting which can't be removed.
1451                         //
1452                         // Give up, and hope the result doesn't break
1453                         // output behavior.
1454                         break;
1455                 }
1456                 if( !ob_end_clean() ) {
1457                         // Could not remove output buffer handler; abort now
1458                         // to avoid getting in some kind of infinite loop.
1459                         break;
1460                 }
1461                 if( $resetGzipEncoding ) {
1462                         if( $status['name'] == 'ob_gzhandler' ) {
1463                                 // Reset the 'Content-Encoding' field set by this handler
1464                                 // so we can start fresh.
1465                                 header( 'Content-Encoding:' );
1466                                 break;
1467                         }
1468                 }
1469         }
1470 }
1471
1472 /**
1473  * More legible than passing a 'false' parameter to wfResetOutputBuffers():
1474  *
1475  * Clear away output buffers, but keep the Content-Encoding header
1476  * produced by ob_gzhandler, if any.
1477  *
1478  * This should be used for HTTP 304 responses, where you need to
1479  * preserve the Content-Encoding header of the real result, but
1480  * also need to suppress the output of ob_gzhandler to keep to spec
1481  * and avoid breaking Firefox in rare cases where the headers and
1482  * body are broken over two packets.
1483  */
1484 function wfClearOutputBuffers() {
1485         wfResetOutputBuffers( false );
1486 }
1487
1488 /**
1489  * Converts an Accept-* header into an array mapping string values to quality
1490  * factors
1491  */
1492 function wfAcceptToPrefs( $accept, $def = '*/*' ) {
1493         # No arg means accept anything (per HTTP spec)
1494         if( !$accept ) {
1495                 return array( $def => 1.0 );
1496         }
1497
1498         $prefs = array();
1499
1500         $parts = explode( ',', $accept );
1501
1502         foreach( $parts as $part ) {
1503                 # FIXME: doesn't deal with params like 'text/html; level=1'
1504                 @list( $value, $qpart ) = explode( ';', trim( $part ) );
1505                 $match = array();
1506                 if( !isset( $qpart ) ) {
1507                         $prefs[$value] = 1.0;
1508                 } elseif( preg_match( '/q\s*=\s*(\d*\.\d+)/', $qpart, $match ) ) {
1509                         $prefs[$value] = floatval($match[1]);
1510                 }
1511         }
1512
1513         return $prefs;
1514 }
1515
1516 /**
1517  * Checks if a given MIME type matches any of the keys in the given
1518  * array. Basic wildcards are accepted in the array keys.
1519  *
1520  * Returns the matching MIME type (or wildcard) if a match, otherwise
1521  * NULL if no match.
1522  *
1523  * @param string $type
1524  * @param array $avail
1525  * @return string
1526  * @private
1527  */
1528 function mimeTypeMatch( $type, $avail ) {
1529         if( array_key_exists($type, $avail) ) {
1530                 return $type;
1531         } else {
1532                 $parts = explode( '/', $type );
1533                 if( array_key_exists( $parts[0] . '/*', $avail ) ) {
1534                         return $parts[0] . '/*';
1535                 } elseif( array_key_exists( '*/*', $avail ) ) {
1536                         return '*/*';
1537                 } else {
1538                         return NULL;
1539                 }
1540         }
1541 }
1542
1543 /**
1544  * Returns the 'best' match between a client's requested internet media types
1545  * and the server's list of available types. Each list should be an associative
1546  * array of type to preference (preference is a float between 0.0 and 1.0).
1547  * Wildcards in the types are acceptable.
1548  *
1549  * @param array $cprefs Client's acceptable type list
1550  * @param array $sprefs Server's offered types
1551  * @return string
1552  *
1553  * @todo FIXME: doesn't handle params like 'text/plain; charset=UTF-8'
1554  * XXX: generalize to negotiate other stuff
1555  */
1556 function wfNegotiateType( $cprefs, $sprefs ) {
1557         $combine = array();
1558
1559         foreach( array_keys($sprefs) as $type ) {
1560                 $parts = explode( '/', $type );
1561                 if( $parts[1] != '*' ) {
1562                         $ckey = mimeTypeMatch( $type, $cprefs );
1563                         if( $ckey ) {
1564                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
1565                         }
1566                 }
1567         }
1568
1569         foreach( array_keys( $cprefs ) as $type ) {
1570                 $parts = explode( '/', $type );
1571                 if( $parts[1] != '*' && !array_key_exists( $type, $sprefs ) ) {
1572                         $skey = mimeTypeMatch( $type, $sprefs );
1573                         if( $skey ) {
1574                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
1575                         }
1576                 }
1577         }
1578
1579         $bestq = 0;
1580         $besttype = NULL;
1581
1582         foreach( array_keys( $combine ) as $type ) {
1583                 if( $combine[$type] > $bestq ) {
1584                         $besttype = $type;
1585                         $bestq = $combine[$type];
1586                 }
1587         }
1588
1589         return $besttype;
1590 }
1591
1592 /**
1593  * Array lookup
1594  * Returns an array where the values in the first array are replaced by the
1595  * values in the second array with the corresponding keys
1596  *
1597  * @return array
1598  */
1599 function wfArrayLookup( $a, $b ) {
1600         return array_flip( array_intersect( array_flip( $a ), array_keys( $b ) ) );
1601 }
1602
1603 /**
1604  * Convenience function; returns MediaWiki timestamp for the present time.
1605  * @return string
1606  */
1607 function wfTimestampNow() {
1608         # return NOW
1609         return wfTimestamp( TS_MW, time() );
1610 }
1611
1612 /**
1613  * Reference-counted warning suppression
1614  */
1615 function wfSuppressWarnings( $end = false ) {
1616         static $suppressCount = 0;
1617         static $originalLevel = false;
1618
1619         if ( $end ) {
1620                 if ( $suppressCount ) {
1621                         --$suppressCount;
1622                         if ( !$suppressCount ) {
1623                                 error_reporting( $originalLevel );
1624                         }
1625                 }
1626         } else {
1627                 if ( !$suppressCount ) {
1628                         $originalLevel = error_reporting( E_ALL & ~( E_WARNING | E_NOTICE ) );
1629                 }
1630                 ++$suppressCount;
1631         }
1632 }
1633
1634 /**
1635  * Restore error level to previous value
1636  */
1637 function wfRestoreWarnings() {
1638         wfSuppressWarnings( true );
1639 }
1640
1641 # Autodetect, convert and provide timestamps of various types
1642
1643 /**
1644  * Unix time - the number of seconds since 1970-01-01 00:00:00 UTC
1645  */
1646 define('TS_UNIX', 0);
1647
1648 /**
1649  * MediaWiki concatenated string timestamp (YYYYMMDDHHMMSS)
1650  */
1651 define('TS_MW', 1);
1652
1653 /**
1654  * MySQL DATETIME (YYYY-MM-DD HH:MM:SS)
1655  */
1656 define('TS_DB', 2);
1657
1658 /**
1659  * RFC 2822 format, for E-mail and HTTP headers
1660  */
1661 define('TS_RFC2822', 3);
1662
1663 /**
1664  * ISO 8601 format with no timezone: 1986-02-09T20:00:00Z
1665  *
1666  * This is used by Special:Export
1667  */
1668 define('TS_ISO_8601', 4);
1669
1670 /**
1671  * An Exif timestamp (YYYY:MM:DD HH:MM:SS)
1672  *
1673  * @see http://exif.org/Exif2-2.PDF The Exif 2.2 spec, see page 28 for the
1674  *       DateTime tag and page 36 for the DateTimeOriginal and
1675  *       DateTimeDigitized tags.
1676  */
1677 define('TS_EXIF', 5);
1678
1679 /**
1680  * Oracle format time.
1681  */
1682 define('TS_ORACLE', 6);
1683
1684 /**
1685  * Postgres format time.
1686  */
1687 define('TS_POSTGRES', 7);
1688
1689 /**
1690  * @param mixed $outputtype A timestamp in one of the supported formats, the
1691  *                          function will autodetect which format is supplied
1692  *                          and act accordingly.
1693  * @return string Time in the format specified in $outputtype
1694  */
1695 function wfTimestamp($outputtype=TS_UNIX,$ts=0) {
1696         $uts = 0;
1697         $da = array();
1698         if ($ts==0) {
1699                 $uts=time();
1700         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/D',$ts,$da)) {
1701                 # TS_DB
1702         } elseif (preg_match('/^(\d{4}):(\d\d):(\d\d) (\d\d):(\d\d):(\d\d)$/D',$ts,$da)) {
1703                 # TS_EXIF
1704         } elseif (preg_match('/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/D',$ts,$da)) {
1705                 # TS_MW
1706         } elseif (preg_match('/^\d{1,13}$/D',$ts)) {
1707                 # TS_UNIX
1708                 $uts = $ts;
1709         } elseif (preg_match('/^\d{1,2}-...-\d\d(?:\d\d)? \d\d\.\d\d\.\d\d/', $ts)) {
1710                 # TS_ORACLE
1711                 $uts = strtotime(preg_replace('/(\d\d)\.(\d\d)\.(\d\d)(\.(\d+))?/', "$1:$2:$3",
1712                                 str_replace("+00:00", "UTC", $ts)));
1713         } elseif (preg_match('/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})Z$/', $ts, $da)) {
1714                 # TS_ISO_8601
1715         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)[\+\- ](\d\d)$/',$ts,$da)) {
1716                 # TS_POSTGRES
1717         } elseif (preg_match('/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d) GMT$/',$ts,$da)) {
1718                 # TS_POSTGRES
1719         } else {
1720                 # Bogus value; fall back to the epoch...
1721                 wfDebug("wfTimestamp() fed bogus time value: $outputtype; $ts\n");
1722                 $uts = 0;
1723         }
1724
1725         if (count( $da ) ) {
1726                 // Warning! gmmktime() acts oddly if the month or day is set to 0
1727                 // We may want to handle that explicitly at some point
1728                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1729                         (int)$da[2],(int)$da[3],(int)$da[1]);
1730         }
1731
1732         switch($outputtype) {
1733                 case TS_UNIX:
1734                         return $uts;
1735                 case TS_MW:
1736                         return gmdate( 'YmdHis', $uts );
1737                 case TS_DB:
1738                         return gmdate( 'Y-m-d H:i:s', $uts );
1739                 case TS_ISO_8601:
1740                         return gmdate( 'Y-m-d\TH:i:s\Z', $uts );
1741                 // This shouldn't ever be used, but is included for completeness
1742                 case TS_EXIF:
1743                         return gmdate(  'Y:m:d H:i:s', $uts );
1744                 case TS_RFC2822:
1745                         return gmdate( 'D, d M Y H:i:s', $uts ) . ' GMT';
1746                 case TS_ORACLE:
1747                         return gmdate( 'd-M-y h.i.s A', $uts) . ' +00:00';
1748                 case TS_POSTGRES:
1749                         return gmdate( 'Y-m-d H:i:s', $uts) . ' GMT';
1750                 default:
1751                         throw new MWException( 'wfTimestamp() called with illegal output type.');
1752         }
1753 }
1754
1755 /**
1756  * Return a formatted timestamp, or null if input is null.
1757  * For dealing with nullable timestamp columns in the database.
1758  * @param int $outputtype
1759  * @param string $ts
1760  * @return string
1761  */
1762 function wfTimestampOrNull( $outputtype = TS_UNIX, $ts = null ) {
1763         if( is_null( $ts ) ) {
1764                 return null;
1765         } else {
1766                 return wfTimestamp( $outputtype, $ts );
1767         }
1768 }
1769
1770 /**
1771  * Check if the operating system is Windows
1772  *
1773  * @return bool True if it's Windows, False otherwise.
1774  */
1775 function wfIsWindows() {
1776         if (substr(php_uname(), 0, 7) == 'Windows') {
1777                 return true;
1778         } else {
1779                 return false;
1780         }
1781 }
1782
1783 /**
1784  * Swap two variables
1785  */
1786 function swap( &$x, &$y ) {
1787         $z = $x;
1788         $x = $y;
1789         $y = $z;
1790 }
1791
1792 function wfGetCachedNotice( $name ) {
1793         global $wgOut, $wgRenderHashAppend, $parserMemc;
1794         $fname = 'wfGetCachedNotice';
1795         wfProfileIn( $fname );
1796
1797         $needParse = false;
1798
1799         if( $name === 'default' ) {
1800                 // special case
1801                 global $wgSiteNotice;
1802                 $notice = $wgSiteNotice;
1803                 if( empty( $notice ) ) {
1804                         wfProfileOut( $fname );
1805                         return false;
1806                 }
1807         } else {
1808                 $notice = wfMsgForContentNoTrans( $name );
1809                 if( wfEmptyMsg( $name, $notice ) || $notice == '-' ) {
1810                         wfProfileOut( $fname );
1811                         return( false );
1812                 }
1813         }
1814
1815         // Use the extra hash appender to let eg SSL variants separately cache.
1816         $key = wfMemcKey( $name . $wgRenderHashAppend );
1817         $cachedNotice = $parserMemc->get( $key );
1818         if( is_array( $cachedNotice ) ) {
1819                 if( md5( $notice ) == $cachedNotice['hash'] ) {
1820                         $notice = $cachedNotice['html'];
1821                 } else {
1822                         $needParse = true;
1823                 }
1824         } else {
1825                 $needParse = true;
1826         }
1827
1828         if( $needParse ) {
1829                 if( is_object( $wgOut ) ) {
1830                         $parsed = $wgOut->parse( $notice );
1831                         $parserMemc->set( $key, array( 'html' => $parsed, 'hash' => md5( $notice ) ), 600 );
1832                         $notice = $parsed;
1833                 } else {
1834                         wfDebug( 'wfGetCachedNotice called for ' . $name . ' with no $wgOut available' );
1835                         $notice = '';
1836                 }
1837         }
1838
1839         wfProfileOut( $fname );
1840         return $notice;
1841 }
1842
1843 function wfGetNamespaceNotice() {
1844         global $wgTitle;
1845
1846         # Paranoia
1847         if ( !isset( $wgTitle ) || !is_object( $wgTitle ) )
1848                 return "";
1849
1850         $fname = 'wfGetNamespaceNotice';
1851         wfProfileIn( $fname );
1852
1853         $key = "namespacenotice-" . $wgTitle->getNsText();
1854         $namespaceNotice = wfGetCachedNotice( $key );
1855         if ( $namespaceNotice && substr ( $namespaceNotice , 0 ,7 ) != "<p>&lt;" ) {
1856                  $namespaceNotice = '<div id="namespacebanner">' . $namespaceNotice . "</div>";
1857         } else {
1858                 $namespaceNotice = "";
1859         }
1860
1861         wfProfileOut( $fname );
1862         return $namespaceNotice;
1863 }
1864
1865 /**
1866  * Gets and returns the site-wide notice
1867  * @return $siteNotice The site-wide notice as set by $wgSiteNotice or MediaWiki:Sitenotice interface message
1868  */
1869 function wfGetSiteNotice() {
1870         global $wgUser, $wgMajorSiteNoticeID, $wgTitle;
1871         global $wgCookiePrefix, $wgCookieExpiration, $wgCookiePath;
1872         $fname = 'wfGetSiteNotice';
1873         wfProfileIn( $fname );
1874         $siteNotice = '';
1875         $loggedIn = false;
1876         $spTitle = SpecialPage::getTitleFor( 'DismissNotice' );
1877         $spUrl = $spTitle->escapeFullURL( array( 'returnto' => $wgTitle->getPrefixedURL() ) );
1878
1879         if( $wgUser instanceOf User && $wgUser->isLoggedIn() ) {
1880                 $loggedIn = true;
1881                 $siteNotice = wfGetCachedNotice('sitenotice');
1882                 if($siteNotice === false) {
1883                         wfProfileOut( $fname );
1884                         return '';
1885                 }
1886         } else {
1887                 $siteNotice = wfGetCachedNotice('anonnotice');
1888                 if($siteNotice === false) {
1889                         $siteNotice = wfGetCachedNotice('sitenotice');
1890                         if($siteNotice === false) {
1891                                 wfProfileOut( $fname );
1892                                 return '';
1893                         }
1894                 }
1895         }
1896
1897         $msgClose = wfMsg( 'sitenotice_close' );
1898         $id = intval( $wgMajorSiteNoticeID ) . "." . intval( wfMsgForContent( 'sitenotice_id' ) );
1899
1900         if( wfRunHooks( 'SiteNoticeBefore', array( &$siteNotice ) ) ) {
1901                 if( $loggedIn ) {
1902                         //it is hidden
1903                         if( isset($_COOKIE[$wgCookiePrefix . 'DismissSiteNotice']) && $_COOKIE[$wgCookiePrefix . 'DismissSiteNotice'] == $id ) {
1904                                 wfProfileOut( $fname );
1905                                 return '';
1906                         }
1907                         $siteNotice = <<<EOT
1908 <table width="100%" id="mw-dismissable-notice"><tr><td width="80%">$siteNotice</td>
1909 <td width="20%" align="right">[<a id="dismissLink" href="$spUrl">$msgClose</a>]</td></tr></table>
1910 <script type="text/javascript" language="JavaScript">
1911 <!--
1912 var cookieName = "{$wgCookiePrefix}DismissSiteNotice=";
1913 var cookiePos = document.cookie.indexOf(cookieName);
1914 var siteNoticeID = "{$id}";
1915
1916 var dismissLink = document.getElementById('dismissLink');
1917 dismissLink.href = "javascript:dismissNotice();";
1918
1919 function dismissNotice() {
1920                 var date = new Date();
1921                 date.setTime(date.getTime() + {$wgCookieExpiration});
1922                 document.cookie = cookieName + siteNoticeID + "; expires="+date.toGMTString() + "; path={$wgCookiePath}";
1923                 var element = document.getElementById('siteNotice');
1924                 element.parentNode.removeChild(element);
1925 }
1926 -->
1927 </script>
1928 EOT;
1929                 }
1930                 if( !$siteNotice ) {
1931                         $siteNotice = wfGetCachedNotice( 'default' );
1932                 }
1933         }
1934
1935         wfRunHooks( 'SiteNoticeAfter', array( &$siteNotice ) );
1936         wfProfileOut( $fname );
1937         return $siteNotice;
1938 }
1939
1940 /**
1941  * BC wrapper for MimeMagic::singleton()
1942  * @deprecated
1943  */
1944 function &wfGetMimeMagic() {
1945         return MimeMagic::singleton();
1946 }
1947
1948 /**
1949  * Tries to get the system directory for temporary files.
1950  * The TMPDIR, TMP, and TEMP environment variables are checked in sequence,
1951  * and if none are set /tmp is returned as the generic Unix default.
1952  *
1953  * NOTE: When possible, use the tempfile() function to create temporary
1954  * files to avoid race conditions on file creation, etc.
1955  *
1956  * @return string
1957  */
1958 function wfTempDir() {
1959         foreach( array( 'TMPDIR', 'TMP', 'TEMP' ) as $var ) {
1960                 $tmp = getenv( $var );
1961                 if( $tmp && file_exists( $tmp ) && is_dir( $tmp ) && is_writable( $tmp ) ) {
1962                         return $tmp;
1963                 }
1964         }
1965         # Hope this is Unix of some kind!
1966         return '/tmp';
1967 }
1968
1969 /**
1970  * Make directory, and make all parent directories if they don't exist
1971  *
1972  * @param string $fullDir Full path to directory to create
1973  * @param int $mode Chmod value to use, default is $wgDirectoryMode
1974  * @return bool
1975  */
1976 function wfMkdirParents( $fullDir, $mode = null ) {
1977         global $wgDirectoryMode;
1978         if( strval( $fullDir ) === '' )
1979                 return true;
1980         if( file_exists( $fullDir ) )
1981                 return true;
1982         // If not defined or isn't an int, set to default
1983         if ( is_null( $mode ) ) {
1984                 $mode = $wgDirectoryMode;
1985         }
1986
1987
1988         # Go back through the paths to find the first directory that exists
1989         $currentDir = $fullDir;
1990         $createList = array();
1991         while ( strval( $currentDir ) !== '' && !file_exists( $currentDir ) ) {
1992                 # Strip trailing slashes
1993                 $currentDir = rtrim( $currentDir, '/\\' );
1994
1995                 # Add to create list
1996                 $createList[] = $currentDir;
1997
1998                 # Find next delimiter searching from the end
1999                 $p = max( strrpos( $currentDir, '/' ), strrpos( $currentDir, '\\' ) );
2000                 if ( $p === false ) {
2001                         $currentDir = false;
2002                 } else {
2003                         $currentDir = substr( $currentDir, 0, $p );
2004                 }
2005         }
2006
2007         if ( count( $createList ) == 0 ) {
2008                 # Directory specified already exists
2009                 return true;
2010         } elseif ( $currentDir === false ) {
2011                 # Went all the way back to root and it apparently doesn't exist
2012                 wfDebugLog( 'mkdir', "Root doesn't exist?\n" );
2013                 return false;
2014         }
2015         # Now go forward creating directories
2016         $createList = array_reverse( $createList );
2017
2018         # Is the parent directory writable?
2019         if ( $currentDir === '' ) {
2020                 $currentDir = '/';
2021         }
2022         if ( !is_writable( $currentDir ) ) {
2023                 wfDebugLog( 'mkdir', "Not writable: $currentDir\n" );
2024                 return false;
2025         }
2026
2027         foreach ( $createList as $dir ) {
2028                 # use chmod to override the umask, as suggested by the PHP manual
2029                 if ( !mkdir( $dir, $mode ) || !chmod( $dir, $mode ) ) {
2030                         wfDebugLog( 'mkdir', "Unable to create directory $dir\n" );
2031                         return false;
2032                 }
2033         }
2034         return true;
2035 }
2036
2037 /**
2038  * Increment a statistics counter
2039  */
2040 function wfIncrStats( $key ) {
2041         global $wgStatsMethod;
2042
2043         if( $wgStatsMethod == 'udp' ) {
2044                 global $wgUDPProfilerHost, $wgUDPProfilerPort, $wgDBname;
2045                 static $socket;
2046                 if (!$socket) {
2047                         $socket=socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
2048                         $statline="stats/{$wgDBname} - 1 1 1 1 1 -total\n";
2049                         socket_sendto($socket,$statline,strlen($statline),0,$wgUDPProfilerHost,$wgUDPProfilerPort);
2050                 }
2051                 $statline="stats/{$wgDBname} - 1 1 1 1 1 {$key}\n";
2052                 @socket_sendto($socket,$statline,strlen($statline),0,$wgUDPProfilerHost,$wgUDPProfilerPort);
2053         } elseif( $wgStatsMethod == 'cache' ) {
2054                 global $wgMemc;
2055                 $key = wfMemcKey( 'stats', $key );
2056                 if ( is_null( $wgMemc->incr( $key ) ) ) {
2057                         $wgMemc->add( $key, 1 );
2058                 }
2059         } else {
2060                 // Disabled
2061         }
2062 }
2063
2064 /**
2065  * @param mixed $nr The number to format
2066  * @param int $acc The number of digits after the decimal point, default 2
2067  * @param bool $round Whether or not to round the value, default true
2068  * @return float
2069  */
2070 function wfPercent( $nr, $acc = 2, $round = true ) {
2071         $ret = sprintf( "%.${acc}f", $nr );
2072         return $round ? round( $ret, $acc ) . '%' : "$ret%";
2073 }
2074
2075 /**
2076  * Encrypt a username/password.
2077  *
2078  * @param string $userid ID of the user
2079  * @param string $password Password of the user
2080  * @return string Hashed password
2081  * @deprecated Use User::crypt() or User::oldCrypt() instead
2082  */
2083 function wfEncryptPassword( $userid, $password ) {
2084         wfDeprecated(__FUNCTION__);
2085         # Just wrap around User::oldCrypt()
2086         return User::oldCrypt($password, $userid);
2087 }
2088
2089 /**
2090  * Appends to second array if $value differs from that in $default
2091  */
2092 function wfAppendToArrayIfNotDefault( $key, $value, $default, &$changed ) {
2093         if ( is_null( $changed ) ) {
2094                 throw new MWException('GlobalFunctions::wfAppendToArrayIfNotDefault got null');
2095         }
2096         if ( $default[$key] !== $value ) {
2097                 $changed[$key] = $value;
2098         }
2099 }
2100
2101 /**
2102  * Since wfMsg() and co suck, they don't return false if the message key they
2103  * looked up didn't exist but a XHTML string, this function checks for the
2104  * nonexistance of messages by looking at wfMsg() output
2105  *
2106  * @param $msg      The message key looked up
2107  * @param $wfMsgOut The output of wfMsg*()
2108  * @return bool
2109  */
2110 function wfEmptyMsg( $msg, $wfMsgOut ) {
2111         return $wfMsgOut === htmlspecialchars( "<$msg>" );
2112 }
2113
2114 /**
2115  * Find out whether or not a mixed variable exists in a string
2116  *
2117  * @param mixed  needle
2118  * @param string haystack
2119  * @return bool
2120  */
2121 function in_string( $needle, $str ) {
2122         return strpos( $str, $needle ) !== false;
2123 }
2124
2125 function wfSpecialList( $page, $details ) {
2126         global $wgContLang;
2127         $details = $details ? ' ' . $wgContLang->getDirMark() . "($details)" : "";
2128         return $page . $details;
2129 }
2130
2131 /**
2132  * Returns a regular expression of url protocols
2133  *
2134  * @return string
2135  */
2136 function wfUrlProtocols() {
2137         global $wgUrlProtocols;
2138
2139         // Support old-style $wgUrlProtocols strings, for backwards compatibility
2140         // with LocalSettings files from 1.5
2141         if ( is_array( $wgUrlProtocols ) ) {
2142                 $protocols = array();
2143                 foreach ($wgUrlProtocols as $protocol)
2144                         $protocols[] = preg_quote( $protocol, '/' );
2145
2146                 return implode( '|', $protocols );
2147         } else {
2148                 return $wgUrlProtocols;
2149         }
2150 }
2151
2152 /**
2153  * Safety wrapper around ini_get() for boolean settings.
2154  * The values returned from ini_get() are pre-normalized for settings
2155  * set via php.ini or php_flag/php_admin_flag... but *not*
2156  * for those set via php_value/php_admin_value.
2157  *
2158  * It's fairly common for people to use php_value instead of php_flag,
2159  * which can leave you with an 'off' setting giving a false positive
2160  * for code that just takes the ini_get() return value as a boolean.
2161  *
2162  * To make things extra interesting, setting via php_value accepts
2163  * "true" and "yes" as true, but php.ini and php_flag consider them false. :)
2164  * Unrecognized values go false... again opposite PHP's own coercion
2165  * from string to bool.
2166  *
2167  * Luckily, 'properly' set settings will always come back as '0' or '1',
2168  * so we only have to worry about them and the 'improper' settings.
2169  *
2170  * I frickin' hate PHP... :P
2171  *
2172  * @param string $setting
2173  * @return bool
2174  */
2175 function wfIniGetBool( $setting ) {
2176         $val = ini_get( $setting );
2177         // 'on' and 'true' can't have whitespace around them, but '1' can.
2178         return strtolower( $val ) == 'on'
2179                 || strtolower( $val ) == 'true'
2180                 || strtolower( $val ) == 'yes'
2181                 || preg_match( "/^\s*[+-]?0*[1-9]/", $val ); // approx C atoi() function
2182 }
2183
2184 /**
2185  * Execute a shell command, with time and memory limits mirrored from the PHP
2186  * configuration if supported.
2187  * @param $cmd Command line, properly escaped for shell.
2188  * @param &$retval optional, will receive the program's exit code.
2189  *                 (non-zero is usually failure)
2190  * @return collected stdout as a string (trailing newlines stripped)
2191  */
2192 function wfShellExec( $cmd, &$retval=null ) {
2193         global $IP, $wgMaxShellMemory, $wgMaxShellFileSize;
2194
2195         if( wfIniGetBool( 'safe_mode' ) ) {
2196                 wfDebug( "wfShellExec can't run in safe_mode, PHP's exec functions are too broken.\n" );
2197                 $retval = 1;
2198                 return "Unable to run external programs in safe mode.";
2199         }
2200         wfInitShellLocale();
2201
2202         if ( php_uname( 's' ) == 'Linux' ) {
2203                 $time = intval( ini_get( 'max_execution_time' ) );
2204                 $mem = intval( $wgMaxShellMemory );
2205                 $filesize = intval( $wgMaxShellFileSize );
2206
2207                 if ( $time > 0 && $mem > 0 ) {
2208                         $script = "$IP/bin/ulimit4.sh";
2209                         if ( is_executable( $script ) ) {
2210                                 $cmd = escapeshellarg( $script ) . " $time $mem $filesize " . escapeshellarg( $cmd );
2211                         }
2212                 }
2213         } elseif ( php_uname( 's' ) == 'Windows NT' ) {
2214                 # This is a hack to work around PHP's flawed invocation of cmd.exe
2215                 # http://news.php.net/php.internals/21796
2216                 $cmd = '"' . $cmd . '"';
2217         }
2218         wfDebug( "wfShellExec: $cmd\n" );
2219
2220         $retval = 1; // error by default?
2221         ob_start();
2222         passthru( $cmd, $retval );
2223         $output = ob_get_contents();
2224         ob_end_clean();
2225
2226         if ( $retval == 127 ) {
2227                 wfDebugLog( 'exec', "Possibly missing executable file: $cmd\n" );
2228         }
2229         return $output;
2230 }
2231
2232 /**
2233  * Workaround for http://bugs.php.net/bug.php?id=45132
2234  * escapeshellarg() destroys non-ASCII characters if LANG is not a UTF-8 locale
2235  */
2236 function wfInitShellLocale() {
2237         static $done = false;
2238         if ( $done ) return;
2239         $done = true;
2240         global $wgShellLocale;
2241         if ( !wfIniGetBool( 'safe_mode' ) ) {
2242                 putenv( "LC_CTYPE=$wgShellLocale" );
2243                 setlocale( LC_CTYPE, $wgShellLocale );
2244         }
2245 }
2246
2247 /**
2248  * This function works like "use VERSION" in Perl, the program will die with a
2249  * backtrace if the current version of PHP is less than the version provided
2250  *
2251  * This is useful for extensions which due to their nature are not kept in sync
2252  * with releases, and might depend on other versions of PHP than the main code
2253  *
2254  * Note: PHP might die due to parsing errors in some cases before it ever
2255  *       manages to call this function, such is life
2256  *
2257  * @see perldoc -f use
2258  *
2259  * @param mixed $version The version to check, can be a string, an integer, or
2260  *                       a float
2261  */
2262 function wfUsePHP( $req_ver ) {
2263         $php_ver = PHP_VERSION;
2264
2265         if ( version_compare( $php_ver, (string)$req_ver, '<' ) )
2266                  throw new MWException( "PHP $req_ver required--this is only $php_ver" );
2267 }
2268
2269 /**
2270  * This function works like "use VERSION" in Perl except it checks the version
2271  * of MediaWiki, the program will die with a backtrace if the current version
2272  * of MediaWiki is less than the version provided.
2273  *
2274  * This is useful for extensions which due to their nature are not kept in sync
2275  * with releases
2276  *
2277  * @see perldoc -f use
2278  *
2279  * @param mixed $version The version to check, can be a string, an integer, or
2280  *                       a float
2281  */
2282 function wfUseMW( $req_ver ) {
2283         global $wgVersion;
2284
2285         if ( version_compare( $wgVersion, (string)$req_ver, '<' ) )
2286                 throw new MWException( "MediaWiki $req_ver required--this is only $wgVersion" );
2287 }
2288
2289 /**
2290  * @deprecated use StringUtils::escapeRegexReplacement
2291  */
2292 function wfRegexReplacement( $string ) {
2293         return StringUtils::escapeRegexReplacement( $string );
2294 }
2295
2296 /**
2297  * Return the final portion of a pathname.
2298  * Reimplemented because PHP5's basename() is buggy with multibyte text.
2299  * http://bugs.php.net/bug.php?id=33898
2300  *
2301  * PHP's basename() only considers '\' a pathchar on Windows and Netware.
2302  * We'll consider it so always, as we don't want \s in our Unix paths either.
2303  *
2304  * @param string $path
2305  * @param string $suffix to remove if present
2306  * @return string
2307  */
2308 function wfBaseName( $path, $suffix='' ) {
2309         $encSuffix = ($suffix == '')
2310                 ? ''
2311                 : ( '(?:' . preg_quote( $suffix, '#' ) . ')?' );
2312         $matches = array();
2313         if( preg_match( "#([^/\\\\]*?){$encSuffix}[/\\\\]*$#", $path, $matches ) ) {
2314                 return $matches[1];
2315         } else {
2316                 return '';
2317         }
2318 }
2319
2320 /**
2321  * Generate a relative path name to the given file.
2322  * May explode on non-matching case-insensitive paths,
2323  * funky symlinks, etc.
2324  *
2325  * @param string $path Absolute destination path including target filename
2326  * @param string $from Absolute source path, directory only
2327  * @return string
2328  */
2329 function wfRelativePath( $path, $from ) {
2330         // Normalize mixed input on Windows...
2331         $path = str_replace( '/', DIRECTORY_SEPARATOR, $path );
2332         $from = str_replace( '/', DIRECTORY_SEPARATOR, $from );
2333
2334         // Trim trailing slashes -- fix for drive root
2335         $path = rtrim( $path, DIRECTORY_SEPARATOR );
2336         $from = rtrim( $from, DIRECTORY_SEPARATOR );
2337
2338         $pieces  = explode( DIRECTORY_SEPARATOR, dirname( $path ) );
2339         $against = explode( DIRECTORY_SEPARATOR, $from );
2340
2341         if( $pieces[0] !== $against[0] ) {
2342                 // Non-matching Windows drive letters?
2343                 // Return a full path.
2344                 return $path;
2345         }
2346
2347         // Trim off common prefix
2348         while( count( $pieces ) && count( $against )
2349                 && $pieces[0] == $against[0] ) {
2350                 array_shift( $pieces );
2351                 array_shift( $against );
2352         }
2353
2354         // relative dots to bump us to the parent
2355         while( count( $against ) ) {
2356                 array_unshift( $pieces, '..' );
2357                 array_shift( $against );
2358         }
2359
2360         array_push( $pieces, wfBaseName( $path ) );
2361
2362         return implode( DIRECTORY_SEPARATOR, $pieces );
2363 }
2364
2365 /**
2366  * array_merge() does awful things with "numeric" indexes, including
2367  * string indexes when happen to look like integers. When we want
2368  * to merge arrays with arbitrary string indexes, we don't want our
2369  * arrays to be randomly corrupted just because some of them consist
2370  * of numbers.
2371  *
2372  * Fuck you, PHP. Fuck you in the ear!
2373  *
2374  * @param array $array1, [$array2, [...]]
2375  * @return array
2376  */
2377 function wfArrayMerge( $array1/* ... */ ) {
2378         $out = $array1;
2379         for( $i = 1; $i < func_num_args(); $i++ ) {
2380                 foreach( func_get_arg( $i ) as $key => $value ) {
2381                         $out[$key] = $value;
2382                 }
2383         }
2384         return $out;
2385 }
2386
2387 /**
2388  * Make a URL index, appropriate for the el_index field of externallinks.
2389  */
2390 function wfMakeUrlIndex( $url ) {
2391         global $wgUrlProtocols; // Allow all protocols defined in DefaultSettings/LocalSettings.php
2392         wfSuppressWarnings();
2393         $bits = parse_url( $url );
2394         wfRestoreWarnings();
2395         if ( !$bits ) {
2396                 return false;
2397         }
2398         // most of the protocols are followed by ://, but mailto: and sometimes news: not, check for it
2399         $delimiter = '';
2400         if ( in_array( $bits['scheme'] . '://' , $wgUrlProtocols ) ) {
2401                 $delimiter = '://';
2402         } elseif ( in_array( $bits['scheme'] .':' , $wgUrlProtocols ) ) {
2403                 $delimiter = ':';
2404                 // parse_url detects for news: and mailto: the host part of an url as path
2405                 // We have to correct this wrong detection
2406                 if ( isset ( $bits['path'] ) ) {
2407                         $bits['host'] = $bits['path'];
2408                         $bits['path'] = '';
2409                 }
2410         } else {
2411                 return false;
2412         }
2413
2414         // Reverse the labels in the hostname, convert to lower case
2415         // For emails reverse domainpart only
2416         if ( $bits['scheme'] == 'mailto' ) {
2417                 $mailparts = explode( '@', $bits['host'], 2 );
2418                 if ( count($mailparts) === 2 ) {
2419                         $domainpart = strtolower( implode( '.', array_reverse( explode( '.', $mailparts[1] ) ) ) );
2420                 } else {
2421                         // No domain specified, don't mangle it
2422                         $domainpart = '';
2423                 }
2424                 $reversedHost = $domainpart . '@' . $mailparts[0];
2425         } else {
2426                 $reversedHost = strtolower( implode( '.', array_reverse( explode( '.', $bits['host'] ) ) ) );
2427         }
2428         // Add an extra dot to the end
2429         // Why? Is it in wrong place in mailto links?
2430         if ( substr( $reversedHost, -1, 1 ) !== '.' ) {
2431                 $reversedHost .= '.';
2432         }
2433         // Reconstruct the pseudo-URL
2434         $prot = $bits['scheme'];
2435         $index = "$prot$delimiter$reversedHost";
2436         // Leave out user and password. Add the port, path, query and fragment
2437         if ( isset( $bits['port'] ) )      $index .= ':' . $bits['port'];
2438         if ( isset( $bits['path'] ) ) {
2439                 $index .= $bits['path'];
2440         } else {
2441                 $index .= '/';
2442         }
2443         if ( isset( $bits['query'] ) )     $index .= '?' . $bits['query'];
2444         if ( isset( $bits['fragment'] ) )  $index .= '#' . $bits['fragment'];
2445         return $index;
2446 }
2447
2448 /**
2449  * Do any deferred updates and clear the list
2450  * TODO: This could be in Wiki.php if that class made any sense at all
2451  */
2452 function wfDoUpdates()
2453 {
2454         global $wgPostCommitUpdateList, $wgDeferredUpdateList;
2455         foreach ( $wgDeferredUpdateList as $update ) {
2456                 $update->doUpdate();
2457         }
2458         foreach ( $wgPostCommitUpdateList as $update ) {
2459                 $update->doUpdate();
2460         }
2461         $wgDeferredUpdateList = array();
2462         $wgPostCommitUpdateList = array();
2463 }
2464
2465 /**
2466  * @deprecated use StringUtils::explodeMarkup
2467  */
2468 function wfExplodeMarkup( $separator, $text ) {
2469         return StringUtils::explodeMarkup( $separator, $text );
2470 }
2471
2472 /**
2473  * Convert an arbitrarily-long digit string from one numeric base
2474  * to another, optionally zero-padding to a minimum column width.
2475  *
2476  * Supports base 2 through 36; digit values 10-36 are represented
2477  * as lowercase letters a-z. Input is case-insensitive.
2478  *
2479  * @param $input string of digits
2480  * @param $sourceBase int 2-36
2481  * @param $destBase int 2-36
2482  * @param $pad int 1 or greater
2483  * @param $lowercase bool
2484  * @return string or false on invalid input
2485  */
2486 function wfBaseConvert( $input, $sourceBase, $destBase, $pad=1, $lowercase=true ) {
2487         $input = strval( $input );
2488         if( $sourceBase < 2 ||
2489                 $sourceBase > 36 ||
2490                 $destBase < 2 ||
2491                 $destBase > 36 ||
2492                 $pad < 1 ||
2493                 $sourceBase != intval( $sourceBase ) ||
2494                 $destBase != intval( $destBase ) ||
2495                 $pad != intval( $pad ) ||
2496                 !is_string( $input ) ||
2497                 $input == '' ) {
2498                 return false;
2499         }
2500         $digitChars = ( $lowercase ) ?  '0123456789abcdefghijklmnopqrstuvwxyz' : '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
2501         $inDigits = array();
2502         $outChars = '';
2503
2504         // Decode and validate input string
2505         $input = strtolower( $input );
2506         for( $i = 0; $i < strlen( $input ); $i++ ) {
2507                 $n = strpos( $digitChars, $input{$i} );
2508                 if( $n === false || $n > $sourceBase ) {
2509                         return false;
2510                 }
2511                 $inDigits[] = $n;
2512         }
2513
2514         // Iterate over the input, modulo-ing out an output digit
2515         // at a time until input is gone.
2516         while( count( $inDigits ) ) {
2517                 $work = 0;
2518                 $workDigits = array();
2519
2520                 // Long division...
2521                 foreach( $inDigits as $digit ) {
2522                         $work *= $sourceBase;
2523                         $work += $digit;
2524
2525                         if( $work < $destBase ) {
2526                                 // Gonna need to pull another digit.
2527                                 if( count( $workDigits ) ) {
2528                                         // Avoid zero-padding; this lets us find
2529                                         // the end of the input very easily when
2530                                         // length drops to zero.
2531                                         $workDigits[] = 0;
2532                                 }
2533                         } else {
2534                                 // Finally! Actual division!
2535                                 $workDigits[] = intval( $work / $destBase );
2536
2537                                 // Isn't it annoying that most programming languages
2538                                 // don't have a single divide-and-remainder operator,
2539                                 // even though the CPU implements it that way?
2540                                 $work = $work % $destBase;
2541                         }
2542                 }
2543
2544                 // All that division leaves us with a remainder,
2545                 // which is conveniently our next output digit.
2546                 $outChars .= $digitChars[$work];
2547
2548                 // And we continue!
2549                 $inDigits = $workDigits;
2550         }
2551
2552         while( strlen( $outChars ) < $pad ) {
2553                 $outChars .= '0';
2554         }
2555
2556         return strrev( $outChars );
2557 }
2558
2559 /**
2560  * Create an object with a given name and an array of construct parameters
2561  * @param string $name
2562  * @param array $p parameters
2563  */
2564 function wfCreateObject( $name, $p ){
2565         $p = array_values( $p );
2566         switch ( count( $p ) ) {
2567                 case 0:
2568                         return new $name;
2569                 case 1:
2570                         return new $name( $p[0] );
2571                 case 2:
2572                         return new $name( $p[0], $p[1] );
2573                 case 3:
2574                         return new $name( $p[0], $p[1], $p[2] );
2575                 case 4:
2576                         return new $name( $p[0], $p[1], $p[2], $p[3] );
2577                 case 5:
2578                         return new $name( $p[0], $p[1], $p[2], $p[3], $p[4] );
2579                 case 6:
2580                         return new $name( $p[0], $p[1], $p[2], $p[3], $p[4], $p[5] );
2581                 default:
2582                         throw new MWException( "Too many arguments to construtor in wfCreateObject" );
2583         }
2584 }
2585
2586 /**
2587  * Alias for modularized function
2588  * @deprecated Use Http::get() instead
2589  */
2590 function wfGetHTTP( $url, $timeout = 'default' ) {
2591         wfDeprecated(__FUNCTION__);
2592         return Http::get( $url, $timeout );
2593 }
2594
2595 /**
2596  * Alias for modularized function
2597  * @deprecated Use Http::isLocalURL() instead
2598  */
2599 function wfIsLocalURL( $url ) {
2600         wfDeprecated(__FUNCTION__);
2601         return Http::isLocalURL( $url );
2602 }
2603
2604 function wfHttpOnlySafe() {
2605         global $wgHttpOnlyBlacklist;
2606         if( !version_compare("5.2", PHP_VERSION, "<") )
2607                 return false;
2608
2609         if( isset( $_SERVER['HTTP_USER_AGENT'] ) ) {
2610                 foreach( $wgHttpOnlyBlacklist as $regex ) {
2611                         if( preg_match( $regex, $_SERVER['HTTP_USER_AGENT'] ) ) {
2612                                 return false;
2613                         }
2614                 }
2615         }
2616
2617         return true;
2618 }
2619
2620 /**
2621  * Initialise php session
2622  */
2623 function wfSetupSession() {
2624         global $wgSessionsInMemcached, $wgCookiePath, $wgCookieDomain, $wgCookieSecure, $wgCookieHttpOnly;
2625         if( $wgSessionsInMemcached ) {
2626                 require_once( 'MemcachedSessions.php' );
2627         } elseif( 'files' != ini_get( 'session.save_handler' ) ) {
2628                 # If it's left on 'user' or another setting from another
2629                 # application, it will end up failing. Try to recover.
2630                 ini_set ( 'session.save_handler', 'files' );
2631         }
2632         $httpOnlySafe = wfHttpOnlySafe();
2633         wfDebugLog( 'cookie',
2634                 'session_set_cookie_params: "' . implode( '", "',
2635                         array(
2636                                 0,
2637                                 $wgCookiePath,
2638                                 $wgCookieDomain,
2639                                 $wgCookieSecure,
2640                                 $httpOnlySafe && $wgCookieHttpOnly ) ) . '"' );
2641         if( $httpOnlySafe && $wgCookieHttpOnly ) {
2642                 session_set_cookie_params( 0, $wgCookiePath, $wgCookieDomain, $wgCookieSecure, $wgCookieHttpOnly );
2643         } else {
2644                 // PHP 5.1 throws warnings if you pass the HttpOnly parameter for 5.2.
2645                 session_set_cookie_params( 0, $wgCookiePath, $wgCookieDomain, $wgCookieSecure );
2646         }
2647         session_cache_limiter( 'private, must-revalidate' );
2648         wfSuppressWarnings();
2649         session_start();
2650         wfRestoreWarnings();
2651 }
2652
2653 /**
2654  * Get an object from the precompiled serialized directory
2655  *
2656  * @return mixed The variable on success, false on failure
2657  */
2658 function wfGetPrecompiledData( $name ) {
2659         global $IP;
2660
2661         $file = "$IP/serialized/$name";
2662         if ( file_exists( $file ) ) {
2663                 $blob = file_get_contents( $file );
2664                 if ( $blob ) {
2665                         return unserialize( $blob );
2666                 }
2667         }
2668         return false;
2669 }
2670
2671 function wfGetCaller( $level = 2 ) {
2672         $backtrace = wfDebugBacktrace();
2673         if ( isset( $backtrace[$level] ) ) {
2674                 return wfFormatStackFrame($backtrace[$level]);
2675         } else {
2676                 $caller = 'unknown';
2677         }
2678         return $caller;
2679 }
2680
2681 /** Return a string consisting all callers in stack, somewhat useful sometimes for profiling specific points */
2682 function wfGetAllCallers() {
2683         return implode('/', array_map('wfFormatStackFrame',array_reverse(wfDebugBacktrace())));
2684 }
2685
2686 /** Return a string representation of frame */
2687 function wfFormatStackFrame($frame) {
2688         return isset( $frame["class"] )?
2689                 $frame["class"]."::".$frame["function"]:
2690                 $frame["function"];
2691 }
2692
2693 /**
2694  * Get a cache key
2695  */
2696 function wfMemcKey( /*... */ ) {
2697         $args = func_get_args();
2698         $key = wfWikiID() . ':' . implode( ':', $args );
2699         return $key;
2700 }
2701
2702 /**
2703  * Get a cache key for a foreign DB
2704  */
2705 function wfForeignMemcKey( $db, $prefix /*, ... */ ) {
2706         $args = array_slice( func_get_args(), 2 );
2707         if ( $prefix ) {
2708                 $key = "$db-$prefix:" . implode( ':', $args );
2709         } else {
2710                 $key = $db . ':' . implode( ':', $args );
2711         }
2712         return $key;
2713 }
2714
2715 /**
2716  * Get an ASCII string identifying this wiki
2717  * This is used as a prefix in memcached keys
2718  */
2719 function wfWikiID( $db = null ) {
2720         if( $db instanceof Database ) {
2721                 return $db->getWikiID();
2722         } else {
2723         global $wgDBprefix, $wgDBname;
2724                 if ( $wgDBprefix ) {
2725                         return "$wgDBname-$wgDBprefix";
2726                 } else {
2727                         return $wgDBname;
2728                 }
2729         }
2730 }
2731
2732 /**
2733  * Split a wiki ID into DB name and table prefix
2734  */
2735 function wfSplitWikiID( $wiki ) {
2736         $bits = explode( '-', $wiki, 2 );
2737         if ( count( $bits ) < 2 ) {
2738                 $bits[] = '';
2739         }
2740         return $bits;
2741 }
2742
2743 /*
2744  * Get a Database object.
2745  * @param integer $db Index of the connection to get. May be DB_MASTER for the
2746  *                master (for write queries), DB_SLAVE for potentially lagged
2747  *                read queries, or an integer >= 0 for a particular server.
2748  *
2749  * @param mixed $groups Query groups. An array of group names that this query
2750  *              belongs to. May contain a single string if the query is only
2751  *              in one group.
2752  *
2753  * @param string $wiki The wiki ID, or false for the current wiki
2754  *
2755  * Note: multiple calls to wfGetDB(DB_SLAVE) during the course of one request
2756  * will always return the same object, unless the underlying connection or load
2757  * balancer is manually destroyed.
2758  */
2759 function &wfGetDB( $db, $groups = array(), $wiki = false ) {
2760         return wfGetLB( $wiki )->getConnection( $db, $groups, $wiki );
2761 }
2762
2763 /**
2764  * Get a load balancer object.
2765  *
2766  * @param array $groups List of query groups
2767  * @param string $wiki Wiki ID, or false for the current wiki
2768  * @return LoadBalancer
2769  */
2770 function wfGetLB( $wiki = false ) {
2771         return wfGetLBFactory()->getMainLB( $wiki );
2772 }
2773
2774 /**
2775  * Get the load balancer factory object
2776  */
2777 function &wfGetLBFactory() {
2778         return LBFactory::singleton();
2779 }
2780
2781 /**
2782  * Find a file.
2783  * Shortcut for RepoGroup::singleton()->findFile()
2784  * @param mixed $title Title object or string. May be interwiki.
2785  * @param mixed $time Requested time for an archived image, or false for the
2786  *                    current version. An image object will be returned which
2787  *                    was created at the specified time.
2788  * @param mixed $flags FileRepo::FIND_ flags
2789  * @return File, or false if the file does not exist
2790  */
2791 function wfFindFile( $title, $time = false, $flags = 0 ) {
2792         return RepoGroup::singleton()->findFile( $title, $time, $flags );
2793 }
2794
2795 /**
2796  * Get an object referring to a locally registered file.
2797  * Returns a valid placeholder object if the file does not exist.
2798  */
2799 function wfLocalFile( $title ) {
2800         return RepoGroup::singleton()->getLocalRepo()->newFile( $title );
2801 }
2802
2803 /**
2804  * Should low-performance queries be disabled?
2805  *
2806  * @return bool
2807  */
2808 function wfQueriesMustScale() {
2809         global $wgMiserMode;
2810         return $wgMiserMode
2811                 || ( SiteStats::pages() > 100000
2812                 && SiteStats::edits() > 1000000
2813                 && SiteStats::users() > 10000 );
2814 }
2815
2816 /**
2817  * Get the path to a specified script file, respecting file
2818  * extensions; this is a wrapper around $wgScriptExtension etc.
2819  *
2820  * @param string $script Script filename, sans extension
2821  * @return string
2822  */
2823 function wfScript( $script = 'index' ) {
2824         global $wgScriptPath, $wgScriptExtension;
2825         return "{$wgScriptPath}/{$script}{$wgScriptExtension}";
2826 }
2827
2828 /**
2829  * Convenience function converts boolean values into "true"
2830  * or "false" (string) values
2831  *
2832  * @param bool $value
2833  * @return string
2834  */
2835 function wfBoolToStr( $value ) {
2836         return $value ? 'true' : 'false';
2837 }
2838
2839 /**
2840  * Load an extension messages file
2841  *
2842  * @param string $extensionName Name of extension to load messages from\for.
2843  * @param string $langcode Language to load messages for, or false for default
2844  *                         behvaiour (en, content language and user language).
2845  * @since r24808 (v1.11) Using this method of loading extension messages will not work
2846  * on MediaWiki prior to that
2847  */
2848 function wfLoadExtensionMessages( $extensionName, $langcode = false ) {
2849         global $wgExtensionMessagesFiles, $wgMessageCache, $wgLang, $wgContLang;
2850
2851         #For recording whether extension message files have been loaded in a given language.
2852         static $loaded = array();
2853
2854         if( !array_key_exists( $extensionName, $loaded ) ) {
2855                 $loaded[$extensionName] = array();
2856         }
2857
2858         if ( !isset($wgExtensionMessagesFiles[$extensionName]) ) {
2859                 throw new MWException( "Messages file for extensions $extensionName is not defined" );
2860         }
2861
2862         if( !$langcode && !array_key_exists( '*', $loaded[$extensionName] ) ) {
2863                 # Just do en, content language and user language.
2864                 $wgMessageCache->loadMessagesFile( $wgExtensionMessagesFiles[$extensionName], false );
2865                 # Mark that they have been loaded.
2866                 $loaded[$extensionName]['en'] = true;
2867                 $loaded[$extensionName][$wgLang->getCode()] = true;
2868                 $loaded[$extensionName][$wgContLang->getCode()] = true;
2869                 # Mark that this part has been done to avoid weird if statements.
2870                 $loaded[$extensionName]['*'] = true;
2871         } elseif( is_string( $langcode ) && !array_key_exists( $langcode, $loaded[$extensionName] ) ) {
2872                 # Load messages for specified language.
2873                 $wgMessageCache->loadMessagesFile( $wgExtensionMessagesFiles[$extensionName], $langcode );
2874                 # Mark that they have been loaded.
2875                 $loaded[$extensionName][$langcode] = true;
2876         }
2877 }
2878
2879 /**
2880  * Get a platform-independent path to the null file, e.g.
2881  * /dev/null
2882  *
2883  * @return string
2884  */
2885 function wfGetNull() {
2886         return wfIsWindows()
2887                 ? 'NUL'
2888                 : '/dev/null';
2889 }
2890
2891 /**
2892  * Displays a maxlag error
2893  *
2894  * @param string $host Server that lags the most
2895  * @param int $lag Maxlag (actual)
2896  * @param int $maxLag Maxlag (requested)
2897  */
2898 function wfMaxlagError( $host, $lag, $maxLag ) {
2899         global $wgShowHostnames;
2900         header( 'HTTP/1.1 503 Service Unavailable' );
2901         header( 'Retry-After: ' . max( intval( $maxLag ), 5 ) );
2902         header( 'X-Database-Lag: ' . intval( $lag ) );
2903         header( 'Content-Type: text/plain' );
2904         if( $wgShowHostnames ) {
2905                 echo "Waiting for $host: $lag seconds lagged\n";
2906         } else {
2907                 echo "Waiting for a database server: $lag seconds lagged\n";
2908         }
2909 }
2910
2911 /**
2912  * Throws an E_USER_NOTICE saying that $function is deprecated
2913  * @param string $function
2914  * @return null
2915  */
2916 function wfDeprecated( $function ) {
2917         global $wgDebugLogFile;
2918         if ( !$wgDebugLogFile ) {
2919                 return;
2920         }
2921         $callers = wfDebugBacktrace();
2922         if( isset( $callers[2] ) ){
2923                 $callerfunc = $callers[2];
2924                 $callerfile = $callers[1];
2925                 if( isset( $callerfile['file'] ) && isset( $callerfile['line'] ) ){
2926                         $file = $callerfile['file'] . ' at line ' . $callerfile['line'];
2927                 } else {
2928                         $file = '(internal function)';
2929                 }
2930                 $func = '';
2931                 if( isset( $callerfunc['class'] ) )
2932                         $func .= $callerfunc['class'] . '::';
2933                 $func .= @$callerfunc['function'];
2934                 $msg = "Use of $function is deprecated. Called from $func in $file";
2935         } else {
2936                 $msg = "Use of $function is deprecated.";
2937         }
2938         wfDebug( "$msg\n" );
2939 }
2940
2941 /**
2942  * Sleep until the worst slave's replication lag is less than or equal to
2943  * $maxLag, in seconds.  Use this when updating very large numbers of rows, as
2944  * in maintenance scripts, to avoid causing too much lag.  Of course, this is
2945  * a no-op if there are no slaves.
2946  *
2947  * Every time the function has to wait for a slave, it will print a message to
2948  * that effect (and then sleep for a little while), so it's probably not best
2949  * to use this outside maintenance scripts in its present form.
2950  *
2951  * @param int $maxLag
2952  * @return null
2953  */
2954 function wfWaitForSlaves( $maxLag ) {
2955         if( $maxLag ) {
2956                 $lb = wfGetLB();
2957                 list( $host, $lag ) = $lb->getMaxLag();
2958                 while( $lag > $maxLag ) {
2959                         $name = @gethostbyaddr( $host );
2960                         if( $name !== false ) {
2961                                 $host = $name;
2962                         }
2963                         print "Waiting for $host (lagged $lag seconds)...\n";
2964                         sleep($maxLag);
2965                         list( $host, $lag ) = $lb->getMaxLag();
2966                 }
2967         }
2968 }
2969
2970 /** Generate a random 32-character hexadecimal token.
2971  * @param mixed $salt Some sort of salt, if necessary, to add to random characters before hashing.
2972  */
2973 function wfGenerateToken( $salt = '' ) {
2974         $salt = serialize($salt);
2975
2976         return md5( mt_rand( 0, 0x7fffffff ) . $salt );
2977 }
2978
2979 /**
2980  * Replace all invalid characters with -
2981  * @param mixed $title Filename to process
2982  */
2983 function wfStripIllegalFilenameChars( $name ) {
2984         $name = wfBaseName( $name );
2985         $name = preg_replace ( "/[^".Title::legalChars()."]|:/", '-', $name );
2986         return $name;
2987 }