includes/GlobalFunctions.php

   1 <?php
   2 # Global functions used everywhere
   3 # $Id$
   4
   5 $wgNumberOfArticles = -1; # Unset
   6 $wgTotalViews = -1;
   7 $wgTotalEdits = -1;
   8
   9 require_once( 'DatabaseFunctions.php' );
  10 require_once( 'UpdateClasses.php' );
  11 require_once( 'LogPage.php' );
  12
  13 /*
  14  * Compatibility functions
  15  */
  16
  17 # PHP <4.3.x is not actively supported; 4.1.x and 4.2.x might or might not work.
  18 # <4.1.x will not work, as we use a number of features introduced in 4.1.0
  19 # such as the new autoglobals.
  20
  21 if( !function_exists('iconv') ) {
  22         # iconv support is not in the default configuration and so may not be present.
  23         # Assume will only ever use utf-8 and iso-8859-1.
  24         # This will *not* work in all circumstances.
  25         function iconv( $from, $to, $string ) {
  26                 if(strcasecmp( $from, $to ) == 0) return $string;
  27                 if(strcasecmp( $from, 'utf-8' ) == 0) return utf8_decode( $string );
  28                 if(strcasecmp( $to, 'utf-8' ) == 0) return utf8_encode( $string );
  29                 return $string;
  30         }
  31 }
  32
  33 if( !function_exists('file_get_contents') ) {
  34         # Exists in PHP 4.3.0+
  35         function file_get_contents( $filename ) {
  36                 return implode( '', file( $filename ) );
  37         }
  38 }
  39
  40 if( !function_exists('is_a') ) {
  41         # Exists in PHP 4.2.0+
  42         function is_a( $object, $class_name ) {
  43                 return
  44                         (strcasecmp( get_class( $object ), $class_name ) == 0) ||
  45                          is_subclass_of( $object, $class_name );
  46         }
  47 }
  48
  49 # html_entity_decode exists in PHP 4.3.0+ but is FATALLY BROKEN even then,
  50 # with no UTF-8 support.
  51 function do_html_entity_decode( $string, $quote_style=ENT_COMPAT, $charset='ISO-8859-1' ) {
  52         static $trans;
  53         if( !isset( $trans ) ) {
  54                 $trans = array_flip( get_html_translation_table( HTML_ENTITIES, $quote_style ) );
  55                 # Assumes $charset will always be the same through a run, and only understands
  56                 # utf-8 or default. Note - mixing latin1 named entities and unicode numbered
  57                 # ones will result in a bad link.
  58                 if( strcasecmp( 'utf-8', $charset ) == 0 ) {
  59                         $trans = array_map( 'utf8_encode', $trans );
  60                 }
  61         }
  62         return strtr( $string, $trans );
  63 }
  64
  65 $wgRandomSeeded = false;
  66
  67 # Seed Mersenne Twister
  68 # Only necessary in PHP < 4.2.0
  69 function wfSeedRandom()
  70 {
  71         global $wgRandomSeeded;
  72
  73         if ( ! $wgRandomSeeded && version_compare( phpversion(), '4.2.0' ) < 0 ) {
  74                 $seed = hexdec(substr(md5(microtime()),-8)) & 0x7fffffff;
  75                 mt_srand( $seed );
  76                 $wgRandomSeeded = true;
  77         }
  78 }
  79
  80 # Generates a URL from a URL-encoded title and a query string
  81 # Title::getLocalURL() is preferred in most cases
  82 #
  83 function wfLocalUrl( $a, $q = '' )
  84 {
  85         global $wgServer, $wgScript, $wgArticlePath;
  86
  87         $a = str_replace( ' ', '_', $a );
  88
  89         if ( '' == $a ) {
  90                 if( '' == $q ) {
  91                         $a = $wgScript;
  92                 } else {
  93                         $a = "{$wgScript}?{$q}";
  94                 }
  95         } else if ( '' == $q ) {
  96                 $a = str_replace( "$1", $a, $wgArticlePath );
  97         } else if ($wgScript != '' ) {
  98                 $a = "{$wgScript}?title={$a}&{$q}";
  99         } else { //XXX hackish solution for toplevel wikis
 100                 $a = "/{$a}?{$q}";
 101         }
 102         return $a;
 103 }
 104
 105 function wfLocalUrlE( $a, $q = '' )
 106 {
 107         return wfEscapeHTML( wfLocalUrl( $a, $q ) );
 108         # die( "Call to obsolete function wfLocalUrlE()" );
 109 }
 110
 111 function wfFullUrl( $a, $q = '' ) {
 112         wfDebugDieBacktrace( 'Call to obsolete function wfFullUrl(); use Title::getFullURL' );
 113 }
 114
 115 function wfFullUrlE( $a, $q = '' ) {
 116         wfDebugDieBacktrace( 'Call to obsolete function wfFullUrlE(); use Title::getFullUrlE' );
 117
 118 }
 119
 120 // orphan function wfThumbUrl( $img )
 121 //{
 122 //      global $wgUploadPath;
 123 //
 124 //      $nt = Title::newFromText( $img );
 125 //      if( !$nt ) return "";
 126 //
 127 //      $name = $nt->getDBkey();
 128 //      $hash = md5( $name );
 129 //
 130 //      $url = "{$wgUploadPath}/thumb/" . $hash{0} . "/" .
 131 //        substr( $hash, 0, 2 ) . "/{$name}";
 132 //      return wfUrlencode( $url );
 133 //}
 134
 135
 136 function wfImageArchiveUrl( $name )
 137 {
 138         global $wgUploadPath;
 139
 140         $hash = md5( substr( $name, 15) );
 141         $url = "{$wgUploadPath}/archive/" . $hash{0} . "/" .
 142           substr( $hash, 0, 2 ) . "/{$name}";
 143         return wfUrlencode($url);
 144 }
 145
 146 function wfUrlencode ( $s )
 147 {
 148         $s = urlencode( $s );
 149         $s = preg_replace( '/%3[Aa]/', ':', $s );
 150         $s = preg_replace( '/%2[Ff]/', '/', $s );
 151
 152         return $s;
 153 }
 154
 155 function wfUtf8Sequence($codepoint) {
 156         if($codepoint <         0x80) return chr($codepoint);
 157         if($codepoint <    0x800) return chr($codepoint >>      6 & 0x3f | 0xc0) .
 158                                                                          chr($codepoint           & 0x3f | 0x80);
 159         if($codepoint <  0x10000) return chr($codepoint >> 12 & 0x0f | 0xe0) .
 160                                                                          chr($codepoint >>      6 & 0x3f | 0x80) .
 161                                                                          chr($codepoint           & 0x3f | 0x80);
 162         if($codepoint < 0x100000) return chr($codepoint >> 18 & 0x07 | 0xf0) . # Double-check this
 163                                                                          chr($codepoint >> 12 & 0x3f | 0x80) .
 164                                                                          chr($codepoint >>      6 & 0x3f | 0x80) .
 165                                                                          chr($codepoint           & 0x3f | 0x80);
 166         # Doesn't yet handle outside the BMP
 167         return "&#$codepoint;";
 168 }
 169
 170 # Converts numeric character entities to UTF-8
 171 function wfMungeToUtf8($string) {
 172         global $wgInputEncoding; # This is debatable
 173         #$string = iconv($wgInputEncoding, "UTF-8", $string);
 174         $string = preg_replace ( '/&#([0-9]+);/e', 'wfUtf8Sequence($1)', $string );
 175         $string = preg_replace ( '/&#x([0-9a-f]+);/ie', 'wfUtf8Sequence(0x$1)', $string );
 176         # Should also do named entities here
 177         return $string;
 178 }
 179
 180 # Converts a single UTF-8 character into the corresponding HTML character entity
 181 function wfUtf8Entity( $matches ) {
 182         $char = $matches[0];
 183         # Find the length
 184         $z = ord( $char{0} );
 185         if ( $z & 0x80 ) {
 186                 $length = 0;
 187                 while ( $z & 0x80 ) {
 188                         $length++;
 189                         $z <<= 1;
 190                 }
 191         } else {
 192                 $length = 1;
 193         }
 194
 195         if ( $length != strlen( $char ) ) {
 196                 return '';
 197         }
 198         if ( $length == 1 ) {
 199                 return $char;
 200         }
 201
 202         # Mask off the length-determining bits and shift back to the original location
 203         $z &= 0xff;
 204         $z >>= $length;
 205
 206         # Add in the free bits from subsequent bytes
 207         for ( $i=1; $i<$length; $i++ ) {
 208                 $z <<= 6;
 209                 $z |= ord( $char{$i} ) & 0x3f;
 210         }
 211
 212         # Make entity
 213         return "&#$z;";
 214 }
 215
 216 # Converts all multi-byte characters in a UTF-8 string into the appropriate character entity
 217 function wfUtf8ToHTML($string) {
 218         return preg_replace_callback( '/[\\xc0-\\xfd][\\x80-\\xbf]*/', 'wfUtf8Entity', $string );
 219 }
 220
 221 function wfDebug( $text, $logonly = false )
 222 {
 223         global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly, $wgDebugRawPage;
 224
 225         # Check for raw action using $_GET not $wgRequest, since the latter might not be initialised yet
 226         if ( isset( $_GET['action'] ) && $_GET['action'] == 'raw' && !$wgDebugRawPage ) {
 227                 return;
 228         }
 229
 230         if ( isset( $wgOut ) && $wgDebugComments && !$logonly ) {
 231                 $wgOut->debug( $text );
 232         }
 233         if ( "" != $wgDebugLogFile && !$wgProfileOnly ) {
 234                 error_log( $text, 3, $wgDebugLogFile );
 235         }
 236 }
 237
 238 # Log for database errors
 239 function wfLogDBError( $text ) {
 240         global $wgDBerrorLog;
 241         if ( $wgDBerrorLog ) {
 242                 $text = date("D M j G:i:s T Y") . "\t$text";
 243                 error_log( $text, 3, $wgDBerrorLog );
 244         }
 245 }
 246
 247 function logProfilingData()
 248 {
 249         global $wgRequestTime, $wgDebugLogFile, $wgDebugRawPage, $wgRequest;
 250         global $wgProfiling, $wgProfileStack, $wgProfileLimit, $wgUser;
 251         $now = wfTime();
 252
 253         list( $usec, $sec ) = explode( " ", $wgRequestTime );
 254         $start = (float)$sec + (float)$usec;
 255         $elapsed = $now - $start;
 256         if ( $wgProfiling ) {
 257                 $prof = wfGetProfilingOutput( $start, $elapsed );
 258                 $forward = '';
 259                 if( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
 260                         $forward = ' forwarded for ' . $_SERVER['HTTP_X_FORWARDED_FOR'];
 261                 if( !empty( $_SERVER['HTTP_CLIENT_IP'] ) )
 262                         $forward .= ' client IP ' . $_SERVER['HTTP_CLIENT_IP'];
 263                 if( !empty( $_SERVER['HTTP_FROM'] ) )
 264                         $forward .= ' from ' . $_SERVER['HTTP_FROM'];
 265                 if( $forward )
 266                         $forward = "\t(proxied via {$_SERVER['REMOTE_ADDR']}{$forward})";
 267                 if($wgUser->getId() == 0)
 268                         $forward .= ' anon';
 269                 $log = sprintf( "%s\t%04.3f\t%s\n",
 270                   gmdate( 'YmdHis' ), $elapsed,
 271                   urldecode( $_SERVER['REQUEST_URI'] . $forward ) );
 272                 if ( '' != $wgDebugLogFile && ( $wgRequest->getVal('action') != 'raw' || $wgDebugRawPage ) ) {
 273                         error_log( $log . $prof, 3, $wgDebugLogFile );
 274                 }
 275         }
 276 }
 277
 278
 279 function wfReadOnly()
 280 {
 281         global $wgReadOnlyFile;
 282
 283         if ( "" == $wgReadOnlyFile ) { return false; }
 284         return is_file( $wgReadOnlyFile );
 285 }
 286
 287 $wgReplacementKeys = array( "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9" );
 288
 289 # Get a message from anywhere
 290 function wfMsg( $key ) {
 291         global $wgRequest;
 292         if ( $wgRequest->getVal( 'debugmsg' ) )
 293         {
 294                 if ( $key == 'linktrail' /* a special case where we want to return something specific */ )
 295                         return "/^()(.*)$/sD";
 296                 else
 297                         return $key;
 298         }
 299         $args = func_get_args();
 300         if ( count( $args ) ) {
 301                 array_shift( $args );
 302         }
 303         return wfMsgReal( $key, $args, true );
 304 }
 305
 306 # Get a message from the language file
 307 function wfMsgNoDB( $key ) {
 308         $args = func_get_args();
 309         if ( count( $args ) ) {
 310                 array_shift( $args );
 311         }
 312         return wfMsgReal( $key, $args, false );
 313 }
 314
 315 # Really get a message
 316 function wfMsgReal( $key, $args, $useDB ) {
 317         global $wgReplacementKeys, $wgMessageCache, $wgLang;
 318
 319         $fname = 'wfMsg';
 320         wfProfileIn( $fname );
 321         if ( $wgMessageCache ) {
 322                 $message = $wgMessageCache->get( $key, $useDB );
 323         } elseif ( $wgLang ) {
 324                 $message = $wgLang->getMessage( $key );
 325         } else {
 326                 wfDebug( "No language object when getting $key\n" );
 327                 $message = "&lt;$key&gt;";
 328         }
 329
 330         # Replace arguments
 331         if( count( $args ) ) {
 332                 $message = str_replace( $wgReplacementKeys, $args, $message );
 333         }
 334         wfProfileOut( $fname );
 335         return $message;
 336 }
 337
 338 function wfCleanFormFields( $fields )
 339 {
 340         wfDebugDieBacktrace( 'Call to obsolete wfCleanFormFields(). Use wgRequest instead...' );
 341 }
 342
 343 function wfMungeQuotes( $in )
 344 {
 345         $out = str_replace( '%', '%25', $in );
 346         $out = str_replace( "'", '%27', $out );
 347         $out = str_replace( '"', '%22', $out );
 348         return $out;
 349 }
 350
 351 function wfDemungeQuotes( $in )
 352 {
 353         $out = str_replace( '%22', '"', $in );
 354         $out = str_replace( '%27', "'", $out );
 355         $out = str_replace( '%25', '%', $out );
 356         return $out;
 357 }
 358
 359 function wfCleanQueryVar( $var )
 360 {
 361         wfDebugDieBacktrace( 'Call to obsolete function wfCleanQueryVar(); use wgRequest instead' );
 362 }
 363
 364 function wfSearch( $s )
 365 {
 366         $se = new SearchEngine( $s );
 367         $se->showResults();
 368 }
 369
 370 function wfGo( $s )
 371 { # pick the nearest match
 372         $se = new SearchEngine( $s );
 373         $se->goResult();
 374 }
 375
 376 # Just like exit() but makes a note of it.
 377 # Commits open transactions except if the error parameter is set
 378 function wfAbruptExit( $error = false ){
 379         global $wgLoadBalancer;
 380         static $called = false;
 381         if ( $called ){
 382                 exit();
 383         }
 384         $called = true;
 385
 386         if( function_exists( 'debug_backtrace' ) ){ // PHP >= 4.3
 387                 $bt = debug_backtrace();
 388                 for($i = 0; $i < count($bt) ; $i++){
 389                         $file = $bt[$i]['file'];
 390                         $line = $bt[$i]['line'];
 391                         wfDebug("WARNING: Abrupt exit in $file at line $line\n");
 392                 }
 393         } else {
 394                 wfDebug('WARNING: Abrupt exit\n');
 395         }
 396         if ( !$error ) {
 397                 $wgLoadBalancer->closeAll();
 398         }
 399         exit();
 400 }
 401
 402 function wfErrorExit() {
 403         wfAbruptExit( true );
 404 }
 405
 406 function wfDebugDieBacktrace( $msg = '' ) {
 407         global $wgCommandLineMode;
 408
 409         if ( function_exists( 'debug_backtrace' ) ) {
 410                 if ( $wgCommandLineMode ) {
 411                         $msg .= "\nBacktrace:\n";
 412                 } else {
 413                         $msg .= "\n<p>Backtrace:</p>\n<ul>\n";
 414                 }
 415                 $backtrace = debug_backtrace();
 416                 foreach( $backtrace as $call ) {
 417                         $f = explode( DIRECTORY_SEPARATOR, $call['file'] );
 418                         $file = $f[count($f)-1];
 419                         if ( $wgCommandLineMode ) {
 420                                 $msg .= "$file line {$call['line']} calls ";
 421                         } else {
 422                                 $msg .= '<li>' . $file . " line " . $call['line'] . ' calls ';
 423                         }
 424                         if( !empty( $call['class'] ) ) $msg .= $call['class'] . '::';
 425                         $msg .= $call['function'] . "()";
 426
 427                         if ( $wgCommandLineMode ) {
 428                                 $msg .= "\n";
 429                         } else {
 430                                 $msg .= "</li>\n";
 431                         }
 432                 }
 433          }
 434          die( $msg );
 435 }
 436
 437 function wfNumberOfArticles()
 438 {
 439         global $wgNumberOfArticles;
 440
 441         wfLoadSiteStats();
 442         return $wgNumberOfArticles;
 443 }
 444
 445 /* private */ function wfLoadSiteStats()
 446 {
 447         global $wgNumberOfArticles, $wgTotalViews, $wgTotalEdits;
 448         $fname = 'wfLoadSiteStats';
 449
 450         if ( -1 != $wgNumberOfArticles ) return;
 451         $dbr =& wfGetDB( DB_SLAVE );
 452         $s = $dbr->getArray( 'site_stats',
 453                 array( 'ss_total_views', 'ss_total_edits', 'ss_good_articles' ),
 454                 array( 'ss_row_id' => 1 ), $fname
 455         );
 456
 457         if ( $s === false ) {
 458                 return;
 459         } else {
 460                 $wgTotalViews = $s->ss_total_views;
 461                 $wgTotalEdits = $s->ss_total_edits;
 462                 $wgNumberOfArticles = $s->ss_good_articles;
 463         }
 464 }
 465
 466 function wfEscapeHTML( $in )
 467 {
 468         return str_replace(
 469                 array( '&', '"', '>', '<' ),
 470                 array( '&amp;', '&quot;', '&gt;', '&lt;' ),
 471                 $in );
 472 }
 473
 474 function wfEscapeHTMLTagsOnly( $in ) {
 475         return str_replace(
 476                 array( '"', '>', '<' ),
 477                 array( '&quot;', '&gt;', '&lt;' ),
 478                 $in );
 479 }
 480
 481 function wfUnescapeHTML( $in )
 482 {
 483         $in = str_replace( '&lt;', '<', $in );
 484         $in = str_replace( '&gt;', '>', $in );
 485         $in = str_replace( '&quot;', '"', $in );
 486         $in = str_replace( '&amp;', '&', $in );
 487         return $in;
 488 }
 489
 490 function wfImageDir( $fname )
 491 {
 492         global $wgUploadDirectory;
 493
 494         $hash = md5( $fname );
 495         $oldumask = umask(0);
 496         $dest = $wgUploadDirectory . '/' . $hash{0};
 497         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
 498         $dest .= '/' . substr( $hash, 0, 2 );
 499         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
 500
 501         umask( $oldumask );
 502         return $dest;
 503 }
 504
 505 function wfImageThumbDir( $fname , $subdir='thumb')
 506 {
 507         return wfImageArchiveDir( $fname, $subdir );
 508 }
 509
 510 function wfImageArchiveDir( $fname , $subdir='archive')
 511 {
 512         global $wgUploadDirectory;
 513
 514         $hash = md5( $fname );
 515         $oldumask = umask(0);
 516
 517         # Suppress warning messages here; if the file itself can't
 518         # be written we'll worry about it then.
 519         $archive = "{$wgUploadDirectory}/{$subdir}";
 520         if ( ! is_dir( $archive ) ) { @mkdir( $archive, 0777 ); }
 521         $archive .= '/' . $hash{0};
 522         if ( ! is_dir( $archive ) ) { @mkdir( $archive, 0777 ); }
 523         $archive .= '/' . substr( $hash, 0, 2 );
 524         if ( ! is_dir( $archive ) ) { @mkdir( $archive, 0777 ); }
 525
 526         umask( $oldumask );
 527         return $archive;
 528 }
 529
 530 function wfRecordUpload( $name, $oldver, $size, $desc, $copyStatus = "", $source = "" )
 531 {
 532         global $wgUser, $wgLang, $wgTitle, $wgOut, $wgDeferredUpdateList;
 533         global $wgUseCopyrightUpload;
 534
 535         $fname = 'wfRecordUpload';
 536         $dbw =& wfGetDB( DB_MASTER );
 537
 538         # img_name must be unique
 539         if ( !$dbw->indexUnique( 'image', 'img_name' ) ) {
 540                 wfDebugDieBacktrace( 'Database schema not up to date, please run maintenance/archives/patch-image_name_unique.sql' );
 541         }
 542
 543
 544         $now = wfTimestampNow();
 545         $won = wfInvertTimestamp( $now );
 546         $size = IntVal( $size );
 547
 548         if ( $wgUseCopyrightUpload )
 549           {
 550                 $textdesc = '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $desc . "\n" .
 551                   '== ' . wfMsg ( 'filestatus' ) . " ==\n" . $copyStatus . "\n" .
 552                   '== ' . wfMsg ( 'filesource' ) . " ==\n" . $source ;
 553           }
 554         else $textdesc = $desc ;
 555
 556         $now = wfTimestampNow();
 557         $won = wfInvertTimestamp( $now );
 558
 559         # Test to see if the row exists using INSERT IGNORE
 560         # This avoids race conditions by locking the row until the commit, and also
 561         # doesn't deadlock. SELECT FOR UPDATE causes a deadlock for every race condition.
 562         $dbw->insert( 'image',
 563                 array(
 564                         'img_name' => $name,
 565                         'img_size'=> $size,
 566                         'img_timestamp' => $now,
 567                         'img_description' => $desc,
 568                         'img_user' => $wgUser->getID(),
 569                         'img_user_text' => $wgUser->getName(),
 570                 ), $fname, 'IGNORE'
 571         );
 572         $descTitle = Title::makeTitle( NS_IMAGE, $name );
 573
 574         if ( $dbw->affectedRows() ) {
 575                 # Successfully inserted, this is a new image
 576                 $id = $descTitle->getArticleID();
 577
 578                 if ( $id == 0 ) {
 579                         $seqVal = $dbw->nextSequenceValue( 'cur_cur_id_seq' );
 580                         $dbw->insertArray( 'cur',
 581                                 array(
 582                                         'cur_id' => $seqVal,
 583                                         'cur_namespace' => NS_IMAGE,
 584                                         'cur_title' => $name,
 585                                         'cur_comment' => $desc,
 586                                         'cur_user' => $wgUser->getID(),
 587                                         'cur_user_text' => $wgUser->getName(),
 588                                         'cur_timestamp' => $now,
 589                                         'cur_is_new' => 1,
 590                                         'cur_text' => $textdesc,
 591                                         'inverse_timestamp' => $won,
 592                                         'cur_touched' => $now
 593                                 ), $fname
 594                         );
 595                         $id = $dbw->insertId() or 0; # We should throw an error instead
 596
 597                         RecentChange::notifyNew( $now, $descTitle, 0, $wgUser, $desc );
 598
 599                         $u = new SearchUpdate( $id, $name, $desc );
 600                         $u->doUpdate();
 601                 }
 602         } else {
 603                 # Collision, this is an update of an image
 604                 # Get current image row for update
 605                 $s = $dbw->getArray( 'image', array( 'img_name','img_size','img_timestamp','img_description',
 606                   'img_user','img_user_text' ), array( 'img_name' => $name ), $fname, 'FOR UPDATE' );
 607
 608                 # Insert it into oldimage
 609                 $dbw->insertArray( 'oldimage',
 610                         array(
 611                                 'oi_name' => $s->img_name,
 612                                 'oi_archive_name' => $oldver,
 613                                 'oi_size' => $s->img_size,
 614                                 'oi_timestamp' => $s->img_timestamp,
 615                                 'oi_description' => $s->img_description,
 616                                 'oi_user' => $s->img_user,
 617                                 'oi_user_text' => $s->img_user_text
 618                         ), $fname
 619                 );
 620
 621                 # Update the current image row
 622                 $dbw->updateArray( 'image',
 623                         array( /* SET */
 624                                 'img_size' => $size,
 625                                 'img_timestamp' => wfTimestampNow(),
 626                                 'img_user' => $wgUser->getID(),
 627                                 'img_user_text' => $wgUser->getName(),
 628                                 'img_description' => $desc,
 629                         ), array( /* WHERE */
 630                                 'img_name' => $name
 631                         ), $fname
 632                 );
 633
 634                 # Invalidate the cache for the description page
 635                 $descTitle->invalidateCache();
 636         }
 637
 638         $log = new LogPage( wfMsg( 'uploadlogpage' ), wfMsg( 'uploadlogpagetext' ) );
 639         $da = wfMsg( 'uploadedimage', '[[:' . $wgLang->getNsText(
 640           Namespace::getImage() ) . ":{$name}|{$name}]]" );
 641         $ta = wfMsg( 'uploadedimage', $name );
 642         $log->addEntry( $da, $desc, $ta );
 643 }
 644
 645
 646 /* Some generic result counters, pulled out of SearchEngine */
 647
 648 function wfShowingResults( $offset, $limit )
 649 {
 650         global $wgLang;
 651         return wfMsg( 'showingresults', $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ) );
 652 }
 653
 654 function wfShowingResultsNum( $offset, $limit, $num )
 655 {
 656         global $wgLang;
 657         return wfMsg( 'showingresultsnum', $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ), $wgLang->formatNum( $num ) );
 658 }
 659
 660 function wfViewPrevNext( $offset, $limit, $link, $query = '', $atend = false )
 661 {
 662         global $wgUser, $wgLang;
 663         $fmtLimit = $wgLang->formatNum( $limit );
 664         $prev = wfMsg( 'prevn', $fmtLimit );
 665         $next = wfMsg( 'nextn', $fmtLimit );
 666         $link = wfUrlencode( $link );
 667
 668         $sk = $wgUser->getSkin();
 669         if ( 0 != $offset ) {
 670                 $po = $offset - $limit;
 671                 if ( $po < 0 ) { $po = 0; }
 672                 $q = "limit={$limit}&offset={$po}";
 673                 if ( '' != $query ) { $q .= "&{$query}"; }
 674                 $plink = '<a href="' . wfLocalUrlE( $link, $q ) . "\">{$prev}</a>";
 675         } else { $plink = $prev; }
 676
 677         $no = $offset + $limit;
 678         $q = "limit={$limit}&offset={$no}";
 679         if ( "" != $query ) { $q .= "&{$query}"; }
 680
 681         if ( $atend ) {
 682                 $nlink = $next;
 683         } else {
 684                 $nlink = '<a href="' . wfLocalUrlE( $link, $q ) . "\">{$next}</a>";
 685         }
 686         $nums = wfNumLink( $offset, 20, $link , $query ) . ' | ' .
 687           wfNumLink( $offset, 50, $link, $query ) . ' | ' .
 688           wfNumLink( $offset, 100, $link, $query ) . ' | ' .
 689           wfNumLink( $offset, 250, $link, $query ) . ' | ' .
 690           wfNumLink( $offset, 500, $link, $query );
 691
 692         return wfMsg( 'viewprevnext', $plink, $nlink, $nums );
 693 }
 694
 695 function wfNumLink( $offset, $limit, $link, $query = '' )
 696 {
 697         global $wgUser, $wgLang;
 698         if ( '' == $query ) { $q = ''; }
 699         else { $q = "{$query}&"; }
 700         $q .= "limit={$limit}&offset={$offset}";
 701
 702         $fmtLimit = $wgLang->formatNum( $limit );
 703         $s = '<a href="' . wfLocalUrlE( $link, $q ) . "\">{$fmtLimit}</a>";
 704         return $s;
 705 }
 706
 707 function wfClientAcceptsGzip() {
 708         global $wgUseGzip;
 709         if( $wgUseGzip ) {
 710                 # FIXME: we may want to blacklist some broken browsers
 711                 if( preg_match(
 712                         '/\bgzip(?:;(q)=([0-9]+(?:\.[0-9]+)))?\b/',
 713                         $_SERVER['HTTP_ACCEPT_ENCODING'],
 714                         $m ) ) {
 715                         if( isset( $m[2] ) && ( $m[1] == 'q' ) && ( $m[2] == 0 ) ) return false;
 716                         wfDebug( " accepts gzip\n" );
 717                         return true;
 718                 }
 719         }
 720         return false;
 721 }
 722
 723 # Yay, more global functions!
 724 function wfCheckLimits( $deflimit = 50, $optionname = 'rclimit' ) {
 725         global $wgUser, $wgRequest;
 726
 727         $limit = $wgRequest->getInt( 'limit', 0 );
 728         if( $limit < 0 ) $limit = 0;
 729         if( ( $limit == 0 ) && ( $optionname != '' ) ) {
 730                 $limit = (int)$wgUser->getOption( $optionname );
 731         }
 732         if( $limit <= 0 ) $limit = $deflimit;
 733         if( $limit > 5000 ) $limit = 5000; # We have *some* limits...
 734
 735         $offset = $wgRequest->getInt( 'offset', 0 );
 736         if( $offset < 0 ) $offset = 0;
 737
 738         return array( $limit, $offset );
 739 }
 740
 741 # Escapes the given text so that it may be output using addWikiText()
 742 # without any linking, formatting, etc. making its way through. This
 743 # is achieved by substituting certain characters with HTML entities.
 744 # As required by the callers, <nowiki> is not used. It currently does
 745 # not filter out characters which have special meaning only at the
 746 # start of a line, such as "*".
 747 function wfEscapeWikiText( $text )
 748 {
 749         $text = str_replace(
 750                 array( '[',             '|',      "'",     'ISBN '        , '://'         , "\n=", '{{' ),
 751                 array( '&#91;', '&#124;', '&#39;', 'ISBN&#32;', '&#58;//' , "\n&#61;", '&#123;&#123;' ),
 752                 htmlspecialchars($text) );
 753         return $text;
 754 }
 755
 756 function wfQuotedPrintable( $string, $charset = '' )
 757 {
 758         # Probably incomplete; see RFC 2045
 759         if( empty( $charset ) ) {
 760                 global $wgInputEncoding;
 761                 $charset = $wgInputEncoding;
 762         }
 763         $charset = strtoupper( $charset );
 764         $charset = str_replace( 'ISO-8859', 'ISO8859', $charset ); // ?
 765
 766         $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
 767         $replace = $illegal . '\t ?_';
 768         if( !preg_match( "/[$illegal]/", $string ) ) return $string;
 769         $out = "=?$charset?Q?";
 770         $out .= preg_replace( "/([$replace])/e", 'sprintf("=%02X",ord("$1"))', $string );
 771         $out .= '?=';
 772         return $out;
 773 }
 774
 775 function wfTime(){
 776         $st = explode( ' ', microtime() );
 777         return (float)$st[0] + (float)$st[1];
 778 }
 779
 780 # Changes the first character to an HTML entity
 781 function wfHtmlEscapeFirst( $text ) {
 782         $ord = ord($text);
 783         $newText = substr($text, 1);
 784         return "&#$ord;$newText";
 785 }
 786
 787 # Sets dest to source and returns the original value of dest
 788 # If source is NULL, it just returns the value, it doesn't set the variable
 789 function wfSetVar( &$dest, $source )
 790 {
 791         $temp = $dest;
 792         if ( !is_null( $source ) ) {
 793                 $dest = $source;
 794         }
 795         return $temp;
 796 }
 797
 798 # As for wfSetVar except setting a bit
 799 function wfSetBit( &$dest, $bit, $state = true ) {
 800         $temp = (bool)($dest & $bit );
 801         if ( !is_null( $state ) ) {
 802                 if ( $state ) {
 803                         $dest |= $bit;
 804                 } else {
 805                         $dest &= ~$bit;
 806                 }
 807         }
 808         return $temp;
 809 }
 810
 811 # This function takes two arrays as input, and returns a CGI-style string, e.g.
 812 # "days=7&limit=100". Options in the first array override options in the second.
 813 # Options set to "" will not be output.
 814 function wfArrayToCGI( $array1, $array2 = NULL )
 815 {
 816         if ( !is_null( $array2 ) ) {
 817                 $array1 = $array1 + $array2;
 818         }
 819
 820         $cgi = '';
 821         foreach ( $array1 as $key => $value ) {
 822                 if ( '' !== $value ) {
 823                         if ( '' != $cgi ) {
 824                                 $cgi .= '&';
 825                         }
 826                         $cgi .= "{$key}={$value}";
 827                 }
 828         }
 829         return $cgi;
 830 }
 831
 832 # This is obsolete, use SquidUpdate::purge()
 833 function wfPurgeSquidServers ($urlArr) {
 834         SquidUpdate::purge( $urlArr );
 835 }
 836
 837 # Windows-compatible version of escapeshellarg()
 838 function wfEscapeShellArg( )
 839 {
 840         $args = func_get_args();
 841         $first = true;
 842         $retVal = '';
 843         foreach ( $args as $arg ) {
 844                 if ( !$first ) {
 845                         $retVal .= ' ';
 846                 } else {
 847                         $first = false;
 848                 }
 849
 850                 if ( wfIsWindows() ) {
 851                         $retVal .= '"' . str_replace( '"','\"', $arg ) . '"';
 852                 } else {
 853                         $retVal .= escapeshellarg( $arg );
 854                 }
 855         }
 856         return $retVal;
 857 }
 858
 859 # wfMerge attempts to merge differences between three texts.
 860 # Returns true for a clean merge and false for failure or a conflict.
 861
 862 function wfMerge( $old, $mine, $yours, &$result ){
 863         global $wgDiff3;
 864
 865         # This check may also protect against code injection in
 866         # case of broken installations.
 867         if(! file_exists( $wgDiff3 ) ){
 868                 return false;
 869         }
 870
 871         # Make temporary files
 872         $td = '/tmp/';
 873         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
 874         $mytextFile = fopen( $mytextName = tempnam( $td, 'merge-mine-' ), 'w' );
 875         $yourtextFile = fopen( $yourtextName = tempnam( $td, 'merge-your-' ), 'w' );
 876
 877         fwrite( $oldtextFile, $old ); fclose( $oldtextFile );
 878         fwrite( $mytextFile, $mine ); fclose( $mytextFile );
 879         fwrite( $yourtextFile, $yours ); fclose( $yourtextFile );
 880
 881         # Check for a conflict
 882         $cmd = wfEscapeShellArg( $wgDiff3 ) . ' -a --overlap-only ' .
 883           wfEscapeShellArg( $mytextName ) . ' ' .
 884           wfEscapeShellArg( $oldtextName ) . ' ' .
 885           wfEscapeShellArg( $yourtextName );
 886         $handle = popen( $cmd, 'r' );
 887
 888         if( fgets( $handle ) ){
 889                 $conflict = true;
 890         } else {
 891                 $conflict = false;
 892         }
 893         pclose( $handle );
 894
 895         # Merge differences
 896         $cmd = wfEscapeShellArg( $wgDiff3 ) . ' -a -e --merge ' .
 897           wfEscapeShellArg( $mytextName, $oldtextName, $yourtextName );
 898         $handle = popen( $cmd, 'r' );
 899         $result = '';
 900         do {
 901                 $data = fread( $handle, 8192 );
 902                 if ( strlen( $data ) == 0 ) {
 903                         break;
 904                 }
 905                 $result .= $data;
 906         } while ( true );
 907         pclose( $handle );
 908         unlink( $mytextName ); unlink( $oldtextName ); unlink( $yourtextName );
 909         return ! $conflict;
 910 }
 911
 912 function wfVarDump( $var )
 913 {
 914         global $wgOut;
 915         $s = str_replace("\n","<br>\n", var_export( $var, true ) . "\n");
 916         if ( headers_sent() || !@is_object( $wgOut ) ) {
 917                 print $s;
 918         } else {
 919                 $wgOut->addHTML( $s );
 920         }
 921 }
 922
 923 # Provide a simple HTTP error.
 924 function wfHttpError( $code, $label, $desc ) {
 925         global $wgOut;
 926         $wgOut->disable();
 927         header( "HTTP/1.0 $code $label" );
 928         header( "Status: $code $label" );
 929         $wgOut->sendCacheControl();
 930
 931         # Don't send content if it's a HEAD request.
 932         if( $_SERVER['REQUEST_METHOD'] == 'HEAD' ) {
 933                 header( 'Content-type: text/plain' );
 934                 print "$desc\n";
 935         }
 936 }
 937
 938 # Converts an Accept-* header into an array mapping string values to quality factors
 939 function wfAcceptToPrefs( $accept, $def = '*/*' ) {
 940         # No arg means accept anything (per HTTP spec)
 941         if( !$accept ) {
 942                 return array( $def => 1 );
 943         }
 944
 945         $prefs = array();
 946
 947         $parts = explode( ',', $accept );
 948
 949         foreach( $parts as $part ) {
 950                 # FIXME: doesn't deal with params like 'text/html; level=1'
 951                 @list( $value, $qpart ) = explode( ';', $part );
 952                 if( !isset( $qpart ) ) {
 953                         $prefs[$value] = 1;
 954                 } elseif( preg_match( '/q\s*=\s*(\d*\.\d+)/', $qpart, $match ) ) {
 955                         $prefs[$value] = $match[1];
 956                 }
 957         }
 958
 959         return $prefs;
 960 }
 961
 962 /* private */ function mimeTypeMatch( $type, $avail ) {
 963         if( array_key_exists($type, $avail) ) {
 964                 return $type;
 965         } else {
 966                 $parts = explode( '/', $type );
 967                 if( array_key_exists( $parts[0] . '/*', $avail ) ) {
 968                         return $parts[0] . '/*';
 969                 } elseif( array_key_exists( '*/*', $avail ) ) {
 970                         return '*/*';
 971                 } else {
 972                         return NULL;
 973                 }
 974         }
 975 }
 976
 977 # FIXME: doesn't handle params like 'text/plain; charset=UTF-8'
 978 # XXX: generalize to negotiate other stuff
 979 function wfNegotiateType( $cprefs, $sprefs ) {
 980         $combine = array();
 981
 982         foreach( array_keys($sprefs) as $type ) {
 983                 $parts = explode( '/', $type );
 984                 if( $parts[1] != '*' ) {
 985                         $ckey = mimeTypeMatch( $type, $cprefs );
 986                         if( $ckey ) {
 987                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
 988                         }
 989                 }
 990         }
 991
 992         foreach( array_keys( $cprefs ) as $type ) {
 993                 $parts = explode( '/', $type );
 994                 if( $parts[1] != '*' && !array_key_exists( $type, $sprefs ) ) {
 995                         $skey = mimeTypeMatch( $type, $sprefs );
 996                         if( $skey ) {
 997                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
 998                         }
 999                 }
1000         }
1001
1002         $bestq = 0;
1003         $besttype = NULL;
1004
1005         foreach( array_keys( $combine ) as $type ) {
1006                 if( $combine[$type] > $bestq ) {
1007                         $besttype = $type;
1008                         $bestq = $combine[$type];
1009                 }
1010         }
1011
1012         return $besttype;
1013 }
1014
1015 # Array lookup
1016 # Returns an array where the values in the first array are replaced by the
1017 # values in the second array with the corresponding keys
1018 function wfArrayLookup( $a, $b )
1019 {
1020         return array_flip( array_intersect( array_flip( $a ), array_keys( $b ) ) );
1021 }
1022
1023 # Since Windows is so different to any of the other popular OSes, it seems appropriate
1024 # to have a simple way to test for its presence
1025 function wfIsWindows() {
1026         if (substr(php_uname(), 0, 7) == 'Windows') {
1027                 return true;
1028         } else {
1029                 return false;
1030         }
1031 }
1032
1033
1034 # Ideally we'd be using actual time fields in the db
1035 function wfTimestamp2Unix( $ts ) {
1036         return gmmktime( ( (int)substr( $ts, 8, 2) ),
1037                   (int)substr( $ts, 10, 2 ), (int)substr( $ts, 12, 2 ),
1038                   (int)substr( $ts, 4, 2 ), (int)substr( $ts, 6, 2 ),
1039                   (int)substr( $ts, 0, 4 ) );
1040 }
1041
1042 function wfUnix2Timestamp( $unixtime ) {
1043         return gmdate( "YmdHis", $unixtime );
1044 }
1045
1046 function wfTimestampNow() {
1047         # return NOW
1048         return gmdate( "YmdHis" );
1049 }
1050
1051 # Sorting hack for MySQL 3, which doesn't use index sorts for DESC
1052 function wfInvertTimestamp( $ts ) {
1053         return strtr(
1054                 $ts,
1055                 "0123456789",
1056                 "9876543210"
1057         );
1058 }
1059
1060 # Reference-counted warning suppression
1061 function wfSuppressWarnings( $end = false ) {
1062         static $suppressCount = 0;
1063         static $originalLevel = false;
1064
1065         if ( $end ) {
1066                 if ( $suppressCount ) {
1067                         $suppressCount --;
1068                         if ( !$suppressCount ) {
1069                                 error_reporting( $originalLevel );
1070                         }
1071                 }
1072         } else {
1073                 if ( !$suppressCount ) {
1074                         $originalLevel = error_reporting( E_ALL & ~( E_WARNING | E_NOTICE ) );
1075                 }
1076                 $suppressCount++;
1077         }
1078 }
1079
1080 # Restore error level to previous value
1081 function wfRestoreWarnings() {
1082         wfSuppressWarnings( true );
1083 }
1084
1085 # Autodetect, convert and provide timestamps of various types
1086 define("TS_UNIX",0);    # Standard unix timestamp (number of seconds since 1 Jan 1970)
1087 define("TS_MW",1);      # Mediawiki concatenated string timestamp (yyyymmddhhmmss)
1088 define("TS_DB",2);      # Standard database timestamp (yyyy-mm-dd hh:mm:ss)
1089
1090 function wfTimestamp($outputtype=TS_UNIX,$ts=0) {
1091         if (preg_match("/^(\d{4})\-(\d\d)\-(\d\d) (\d\d):(\d\d):(\d\d)$/",$ts,$da)) {
1092                 # TS_DB
1093                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1094                             (int)$da[2],(int)$da[3],(int)$da[1]);
1095         } elseif (preg_match("/^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/",$ts,$da)) {
1096                 # TS_MW
1097                 $uts=gmmktime((int)$da[4],(int)$da[5],(int)$da[6],
1098                             (int)$da[2],(int)$da[3],(int)$da[1]);
1099         } elseif (preg_match("/^(\d{1,13})$/",$ts,$datearray)) {
1100                 # TS_UNIX
1101                 $uts=$ts;
1102         }
1103
1104         if ($ts==0)
1105                 $uts=time();
1106         switch($outputtype) {
1107         case TS_UNIX:
1108                 return $uts;
1109                 break;
1110         case TS_MW:
1111                 return gmdate( "YmdHis", $uts );
1112                 break;
1113         case TS_DB:
1114                 return gmdate( "Y-m-d H:i:s", $uts );
1115                 break;
1116         default:
1117                 return;
1118         }
1119 }
1120
1121 ?>