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