includes/GlobalFunctions.php

   1 <?
   2 # Global functions used everywhere
   3
   4 $wgNumberOfArticles = -1; # Unset
   5 $wgTotalViews = -1;
   6 $wgTotalEdits = -1;
   7
   8 include_once( "DatabaseFunctions.php" );
   9 include_once( "UpdateClasses.php" );
  10 include_once( "LogPage.php" );
  11
  12 /*
  13  * Compatibility functions
  14  */
  15
  16 # PHP <4.3.x is not actively supported; 4.1.x and 4.2.x might or might not work.
  17 # <4.1.x will not work, as we use a number of features introduced in 4.1.0
  18 # such as the new autoglobals.
  19
  20 if( !function_exists('iconv') ) {
  21         # iconv support is not in the default configuration and so may not be present.
  22         # Assume will only ever use utf-8 and iso-8859-1.
  23         # This will *not* work in all circumstances.
  24         function iconv( $from, $to, $string ) {
  25                 if(strcasecmp( $from, $to ) == 0) return $string;
  26                 if(strcasecmp( $from, "utf-8" ) == 0) return utf8_decode( $string );
  27                 if(strcasecmp( $to, "utf-8" ) == 0) return utf8_encode( $string );
  28                 return $string;
  29         }
  30 }
  31
  32 if( !function_exists('file_get_contents') ) {
  33         # Exists in PHP 4.3.0+
  34         function file_get_contents( $filename ) {
  35                 return implode( "", file( $filename ) );
  36         }
  37 }
  38
  39 $wgRandomSeeded = false;
  40
  41 function wfSeedRandom()
  42 {
  43         global $wgRandomSeeded;
  44
  45         if ( ! $wgRandomSeeded ) {
  46                 $seed = hexdec(substr(md5(microtime()),-8)) & 0x7fffffff;
  47                 mt_srand( $seed );
  48                 $wgRandomSeeded = true;
  49         }
  50 }
  51
  52 function wfLocalUrl( $a, $q = "" )
  53 {
  54         global $wgServer, $wgScript, $wgArticlePath;
  55
  56         $a = str_replace( " ", "_", $a );
  57         #$a = wfUrlencode( $a ); # This stuff is _already_ URL-encoded.
  58
  59         if ( "" == $a ) {
  60                 if( "" == $q ) {
  61                         $a = $wgScript;
  62                 } else {
  63                         $a = "{$wgScript}?{$q}";
  64                 }
  65         } else if ( "" == $q ) {
  66                 $a = str_replace( "$1", $a, $wgArticlePath );
  67         } else {
  68                 $a = "{$wgScript}?title={$a}&{$q}";
  69         }
  70         return $a;
  71 }
  72
  73 function wfLocalUrlE( $a, $q = "" )
  74 {
  75         return wfEscapeHTML( wfLocalUrl( $a, $q ) );
  76 }
  77
  78 function wfFullUrl( $a, $q = "" ) {
  79         global $wgServer;
  80         return $wgServer . wfLocalUrl( $a, $q );
  81 }
  82
  83 function wfFullUrlE( $a, $q = "" ) {
  84         return wfEscapeHTML( wfFullUrl( $a, $q ) );
  85 }
  86
  87 function wfImageUrl( $img )
  88 {
  89         global $wgUploadPath;
  90
  91         $nt = Title::newFromText( $img );
  92         if( !$nt ) return "";
  93
  94         $name = $nt->getDBkey();
  95         $hash = md5( $name );
  96
  97         $url = "{$wgUploadPath}/" . $hash{0} . "/" .
  98           substr( $hash, 0, 2 ) . "/{$name}";
  99         return wfUrlencode( $url );
 100 }
 101
 102 function wfImageArchiveUrl( $name )
 103 {
 104         global $wgUploadPath;
 105
 106         $hash = md5( substr( $name, 15) );
 107         $url = "{$wgUploadPath}/archive/" . $hash{0} . "/" .
 108           substr( $hash, 0, 2 ) . "/{$name}";
 109         return $url;
 110 }
 111
 112 function wfUrlencode ( $s )
 113 {
 114         $ulink = urlencode( $s );
 115         $ulink = preg_replace( "/%3[Aa]/", ":", $ulink );
 116         $ulink = preg_replace( "/%2[Ff]/", "/", $ulink );
 117         return $ulink;
 118 }
 119
 120 function wfUtf8Sequence($codepoint) {
 121         if($codepoint <     0x80) return chr($codepoint);
 122         if($codepoint <    0x800) return chr($codepoint >>  6 & 0x3f | 0xc0) .
 123                                      chr($codepoint       & 0x3f | 0x80);
 124     if($codepoint <  0x10000) return chr($codepoint >> 12 & 0x0f | 0xe0) .
 125                                      chr($codepoint >>  6 & 0x3f | 0x80) .
 126                                      chr($codepoint       & 0x3f | 0x80);
 127         if($codepoint < 0x100000) return chr($codepoint >> 18 & 0x07 | 0xf0) . # Double-check this
 128                                          chr($codepoint >> 12 & 0x3f | 0x80) .
 129                                      chr($codepoint >>  6 & 0x3f | 0x80) .
 130                                      chr($codepoint       & 0x3f | 0x80);
 131         # Doesn't yet handle outside the BMP
 132         return "&#$codepoint;";
 133 }
 134
 135 function wfMungeToUtf8($string) {
 136         global $wgInputEncoding; # This is debatable
 137         #$string = iconv($wgInputEncoding, "UTF-8", $string);
 138         $string = preg_replace ( '/&#([0-9]+);/e', 'wfUtf8Sequence($1)', $string );
 139         $string = preg_replace ( '/&#x([0-9a-f]+);/ie', 'wfUtf8Sequence(0x$1)', $string );
 140         # Should also do named entities here
 141         return $string;
 142 }
 143
 144 function wfDebug( $text, $logonly = false )
 145 {
 146         global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly;
 147
 148         if ( $wgDebugComments && !$logonly ) {
 149                 $wgOut->debug( $text );
 150         }
 151         if ( "" != $wgDebugLogFile && !$wgProfileOnly ) {
 152                 error_log( $text, 3, $wgDebugLogFile );
 153         }
 154 }
 155
 156 function logProfilingData()
 157 {
 158         global $wgRequestTime, $wgDebugLogFile;
 159         global $wgProfiling, $wgProfileStack, $wgProfileLimit, $wgUser;
 160         list( $usec, $sec ) = explode( " ", microtime() );
 161         $now = (float)$sec + (float)$usec;
 162
 163         list( $usec, $sec ) = explode( " ", $wgRequestTime );
 164         $start = (float)$sec + (float)$usec;
 165         $elapsed = $now - $start;
 166         if ( "" != $wgDebugLogFile ) {
 167                 $prof = wfGetProfilingOutput( $start, $elapsed );
 168                 $forward = "";
 169                 if( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
 170                         $forward = " forwarded for " . $_SERVER['HTTP_X_FORWARDED_FOR'];
 171                 if( !empty( $_SERVER['HTTP_CLIENT_IP'] ) )
 172                         $forward .= " client IP " . $_SERVER['HTTP_CLIENT_IP'];
 173                 if( !empty( $_SERVER['HTTP_FROM'] ) )
 174                         $forward .= " from " . $_SERVER['HTTP_FROM'];
 175                 if( $forward )
 176                         $forward = "\t(proxied via {$_SERVER['REMOTE_ADDR']}{$forward})";
 177                 if($wgUser->getId() == 0)
 178                         $forward .= " anon";
 179                 $log = sprintf( "%s\t%04.3f\t%s\n",
 180                   gmdate( "YmdHis" ), $elapsed,
 181                   urldecode( $_SERVER['REQUEST_URI'] . $forward ) );
 182                 error_log( $log . $prof, 3, $wgDebugLogFile );
 183         }
 184 }
 185
 186
 187 function wfReadOnly()
 188 {
 189         global $wgReadOnlyFile;
 190
 191         if ( "" == $wgReadOnlyFile ) { return false; }
 192         return is_file( $wgReadOnlyFile );
 193 }
 194
 195 $wgReplacementKeys = array( "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9" );
 196
 197 # Get a message from anywhere
 198 function wfMsg( $key ) {
 199         $args = func_get_args();
 200         if ( count( $args ) ) {
 201                 array_shift( $args );
 202         }
 203         return wfMsgReal( $key, $args, true );
 204 }
 205
 206 # Get a message from the language file
 207 function wfMsgNoDB( $key ) {
 208         $args = func_get_args();
 209         if ( count( $args ) ) {
 210                 array_shift( $args );
 211         }
 212         return wfMsgReal( $key, $args, false );
 213 }
 214
 215 # Really get a message
 216 function wfMsgReal( $key, $args, $useDB ) {
 217         global $wgReplacementKeys, $wgMessageCache, $wgLang;
 218
 219         $fname = "wfMsg";
 220         wfProfileIn( $fname );
 221         if ( $wgMessageCache ) {
 222                 $message = $wgMessageCache->get( $key, $useDB );
 223         } elseif ( $wgLang ) {
 224                 $message = $wgLang->getMessage( $key );
 225         } else {
 226                 wfDebug( "No language object when getting $key\n" );
 227                 $message = "&lt;$key&gt;";
 228         }
 229
 230         # Replace arguments
 231         if( count( $args ) ) {
 232                 $message = str_replace( $wgReplacementKeys, $args, $message );
 233         }
 234         wfProfileOut( $fname );
 235         return $message;
 236 }
 237
 238 function wfCleanFormFields( $fields )
 239 {
 240         global $HTTP_POST_VARS;
 241         global $wgInputEncoding, $wgOutputEncoding, $wgEditEncoding, $wgLang;
 242
 243         if ( get_magic_quotes_gpc() ) {
 244                 foreach ( $fields as $fname ) {
 245                         if ( isset( $HTTP_POST_VARS[$fname] ) ) {
 246                                 $HTTP_POST_VARS[$fname] = stripslashes(
 247                                   $HTTP_POST_VARS[$fname] );
 248                         }
 249                         global ${$fname};
 250                         if ( isset( ${$fname} ) ) {
 251                                 ${$fname} = stripslashes( ${$fname} );
 252                         }
 253                 }
 254         }
 255         $enc = $wgOutputEncoding;
 256         if( $wgEditEncoding != "") $enc = $wgEditEncoding;
 257         if ( $enc != $wgInputEncoding ) {
 258                 foreach ( $fields as $fname ) {
 259                         if ( isset( $HTTP_POST_VARS[$fname] ) ) {
 260                                 $HTTP_POST_VARS[$fname] = $wgLang->iconv(
 261                                   $wgOutputEncoding, $wgInputEncoding,
 262                                   $HTTP_POST_VARS[$fname] );
 263                         }
 264                         global ${$fname};
 265                         if ( isset( ${$fname} ) ) {
 266                                 ${$fname} = $wgLang->iconv(
 267                                   $enc, $wgInputEncoding, ${$fname} );
 268                         }
 269                 }
 270         }
 271 }
 272
 273 function wfMungeQuotes( $in )
 274 {
 275         $out = str_replace( "%", "%25", $in );
 276         $out = str_replace( "'", "%27", $out );
 277         $out = str_replace( "\"", "%22", $out );
 278         return $out;
 279 }
 280
 281 function wfDemungeQuotes( $in )
 282 {
 283         $out = str_replace( "%22", "\"", $in );
 284         $out = str_replace( "%27", "'", $out );
 285         $out = str_replace( "%25", "%", $out );
 286         return $out;
 287 }
 288
 289 function wfCleanQueryVar( $var )
 290 {
 291         global $wgLang;
 292         if ( get_magic_quotes_gpc() ) {
 293                 $var = stripslashes( $var );
 294         }
 295         return $wgLang->recodeInput( $var );
 296 }
 297
 298 function wfSpecialPage()
 299 {
 300         global $wgUser, $wgOut, $wgTitle, $wgLang;
 301
 302         /* FIXME: this list probably shouldn't be language-specific, per se */
 303         $validSP = $wgLang->getValidSpecialPages();
 304         $sysopSP = $wgLang->getSysopSpecialPages();
 305         $devSP = $wgLang->getDeveloperSpecialPages();
 306
 307         $wgOut->setArticleFlag( false );
 308         $wgOut->setRobotpolicy( "noindex,follow" );
 309
 310         $par = NULL;
 311         list($t, $par) = split( "/", $wgTitle->getDBkey(), 2 );
 312
 313         if ( array_key_exists( $t, $validSP ) ||
 314           ( $wgUser->isSysop() && array_key_exists( $t, $sysopSP ) ) ||
 315           ( $wgUser->isDeveloper() && array_key_exists( $t, $devSP ) ) ) {
 316                 if($par !== NULL)
 317                         $wgTitle = Title::makeTitle( Namespace::getSpecial(), $t );
 318
 319                 $wgOut->setPageTitle( wfMsg( strtolower( $wgTitle->getText() ) ) );
 320
 321                 $inc = "Special" . $t . ".php";
 322                 include_once( $inc );
 323                 $call = "wfSpecial" . $t;
 324                 $call( $par );
 325         } else if ( array_key_exists( $t, $sysopSP ) ) {
 326                 $wgOut->sysopRequired();
 327         } else if ( array_key_exists( $t, $devSP ) ) {
 328                 $wgOut->developerRequired();
 329         } else {
 330                 $wgOut->errorpage( "nosuchspecialpage", "nospecialpagetext" );
 331         }
 332 }
 333
 334 function wfSearch( $s )
 335 {
 336         $se = new SearchEngine( wfCleanQueryVar( $s ) );
 337         $se->showResults();
 338 }
 339
 340 function wfGo( $s )
 341 { # pick the nearest match
 342         $se = new SearchEngine( wfCleanQueryVar( $s ) );
 343         $se->goResult();
 344 }
 345
 346 # Just like exit() but makes a note of it.
 347 function wfAbruptExit(){
 348         static $called = false;
 349         if ( $called ){
 350                 exit();
 351         }
 352         $called = true;
 353
 354         if( function_exists( "debug_backtrace" ) ){ // PHP >= 4.3
 355                 $bt = debug_backtrace();
 356                 for($i = 0; $i < count($bt) ; $i++){
 357                         $file = $bt[$i]["file"];
 358                         $line = $bt[$i]["line"];
 359                         wfDebug("WARNING: Abrupt exit in $file at line $line\n");
 360                 }
 361         } else {
 362                 wfDebug("WARNING: Abrupt exit\n");
 363         }
 364         exit();
 365 }
 366
 367 function wfNumberOfArticles()
 368 {
 369         global $wgNumberOfArticles;
 370
 371         wfLoadSiteStats();
 372         return $wgNumberOfArticles;
 373 }
 374
 375 /* private */ function wfLoadSiteStats()
 376 {
 377         global $wgNumberOfArticles, $wgTotalViews, $wgTotalEdits;
 378         if ( -1 != $wgNumberOfArticles ) return;
 379
 380         $sql = "SELECT ss_total_views, ss_total_edits, ss_good_articles " .
 381           "FROM site_stats WHERE ss_row_id=1";
 382         $res = wfQuery( $sql, DB_READ, "wfLoadSiteStats" );
 383
 384         if ( 0 == wfNumRows( $res ) ) { return; }
 385         else {
 386                 $s = wfFetchObject( $res );
 387                 $wgTotalViews = $s->ss_total_views;
 388                 $wgTotalEdits = $s->ss_total_edits;
 389                 $wgNumberOfArticles = $s->ss_good_articles;
 390         }
 391 }
 392
 393 function wfEscapeHTML( $in )
 394 {
 395         return str_replace(
 396                 array( "&", "\"", ">", "<" ),
 397                 array( "&amp;", "&quot;", "&gt;", "&lt;" ),
 398                 $in );
 399 }
 400
 401 function wfEscapeHTMLTagsOnly( $in ) {
 402         return str_replace(
 403                 array( "\"", ">", "<" ),
 404                 array( "&quot;", "&gt;", "&lt;" ),
 405                 $in );
 406 }
 407
 408 function wfUnescapeHTML( $in )
 409 {
 410         $in = str_replace( "&lt;", "<", $in );
 411         $in = str_replace( "&gt;", ">", $in );
 412         $in = str_replace( "&quot;", "\"", $in );
 413         $in = str_replace( "&amp;", "&", $in );
 414         return $in;
 415 }
 416
 417 function wfImageDir( $fname )
 418 {
 419         global $wgUploadDirectory;
 420
 421         $hash = md5( $fname );
 422         $oldumask = umask(0);
 423         $dest = $wgUploadDirectory . "/" . $hash{0};
 424         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
 425         $dest .= "/" . substr( $hash, 0, 2 );
 426         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
 427
 428         umask( $oldumask );
 429         return $dest;
 430 }
 431
 432 function wfImageArchiveDir( $fname )
 433 {
 434         global $wgUploadDirectory;
 435
 436         $hash = md5( $fname );
 437         $oldumask = umask(0);
 438         $archive = "{$wgUploadDirectory}/archive";
 439         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
 440         $archive .= "/" . $hash{0};
 441         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
 442         $archive .= "/" . substr( $hash, 0, 2 );
 443         if ( ! is_dir( $archive ) ) { mkdir( $archive, 0777 ); }
 444
 445         umask( $oldumask );
 446         return $archive;
 447 }
 448
 449 function wfRecordUpload( $name, $oldver, $size, $desc )
 450 {
 451         global $wgUser, $wgLang, $wgTitle, $wgOut, $wgDeferredUpdateList;
 452         global $wgUseCopyrightUpload , $wpUploadCopyStatus , $wpUploadSource ;
 453
 454         $fname = "wfRecordUpload";
 455
 456         $sql = "SELECT img_name,img_size,img_timestamp,img_description,img_user," .
 457           "img_user_text FROM image WHERE img_name='" . wfStrencode( $name ) . "'";
 458         $res = wfQuery( $sql, DB_READ, $fname );
 459
 460         $now = wfTimestampNow();
 461         $won = wfInvertTimestamp( $now );
 462         $size = IntVal( $size );
 463
 464         if ( $wgUseCopyrightUpload )
 465           {
 466             $textdesc = "== " . wfMsg ( "filedesc" ) . " ==\n" . $desc . "\n" .
 467               "== " . wfMsg ( "filestatus" ) . " ==\n" . $wpUploadCopyStatus . "\n" .
 468               "== " . wfMsg ( "filesource" ) . " ==\n" . $wpUploadSource ;
 469           }
 470         else $textdesc = $desc ;
 471
 472         $now = wfTimestampNow();
 473         $won = wfInvertTimestamp( $now );
 474
 475         if ( 0 == wfNumRows( $res ) ) {
 476                 $sql = "INSERT INTO image (img_name,img_size,img_timestamp," .
 477                   "img_description,img_user,img_user_text) VALUES ('" .
 478                   wfStrencode( $name ) . "',$size,'{$now}','" .
 479                   wfStrencode( $desc ) . "', '" . $wgUser->getID() .
 480                   "', '" . wfStrencode( $wgUser->getName() ) . "')";
 481                 wfQuery( $sql, DB_WRITE, $fname );
 482
 483                 $sql = "SELECT cur_id,cur_text FROM cur WHERE cur_namespace=" .
 484                   Namespace::getImage() . " AND cur_title='" .
 485                   wfStrencode( $name ) . "'";
 486                 $res = wfQuery( $sql, DB_READ, $fname );
 487                 if ( 0 == wfNumRows( $res ) ) {
 488             $common =
 489                           Namespace::getImage() . ",'" .
 490                           wfStrencode( $name ) . "','" .
 491                           wfStrencode( $desc ) . "','" . $wgUser->getID() . "','" .
 492                           wfStrencode( $wgUser->getName() ) . "','" . $now .
 493                           "',1";
 494                         $sql = "INSERT INTO cur (cur_namespace,cur_title," .
 495                           "cur_comment,cur_user,cur_user_text,cur_timestamp,cur_is_new," .
 496                           "cur_text,inverse_timestamp,cur_touched) VALUES (" .
 497                           $common .
 498                           ",'" . wfStrencode( $textdesc ) . "','{$won}','{$now}')";
 499                         wfQuery( $sql, DB_WRITE, $fname );
 500                         $id = wfInsertId() or 0; # We should throw an error instead
 501                         $sql = "INSERT INTO recentchanges (rc_namespace,rc_title,
 502                                 rc_comment,rc_user,rc_user_text,rc_timestamp,rc_new,
 503                                 rc_cur_id,rc_cur_time) VALUES ({$common},{$id},'{$now}')";
 504             wfQuery( $sql, DB_WRITE, $fname );
 505                         $u = new SearchUpdate( $id, $name, $desc );
 506                         $u->doUpdate();
 507                 }
 508         } else {
 509                 $s = wfFetchObject( $res );
 510
 511                 $sql = "INSERT INTO oldimage (oi_name,oi_archive_name,oi_size," .
 512                   "oi_timestamp,oi_description,oi_user,oi_user_text) VALUES ('" .
 513                   wfStrencode( $s->img_name ) . "','" .
 514                   wfStrencode( $oldver ) .
 515                   "',{$s->img_size},'{$s->img_timestamp}','" .
 516                   wfStrencode( $s->img_description ) . "','" .
 517                   wfStrencode( $s->img_user ) . "','" .
 518                   wfStrencode( $s->img_user_text) . "')";
 519                 wfQuery( $sql, DB_WRITE, $fname );
 520
 521                 $sql = "UPDATE image SET img_size={$size}," .
 522                   "img_timestamp='" . wfTimestampNow() . "',img_user='" .
 523                   $wgUser->getID() . "',img_user_text='" .
 524                   wfStrencode( $wgUser->getName() ) . "', img_description='" .
 525                   wfStrencode( $desc ) . "' WHERE img_name='" .
 526                   wfStrencode( $name ) . "'";
 527                 wfQuery( $sql, DB_WRITE, $fname );
 528
 529                 $sql = "UPDATE cur SET cur_touched='{$now}' WHERE cur_namespace=" .
 530                   Namespace::getImage() . " AND cur_title='" .
 531                   wfStrencode( $name ) . "'";
 532                 wfQuery( $sql, DB_WRITE, $fname );
 533         }
 534
 535         $log = new LogPage( wfMsg( "uploadlogpage" ), wfMsg( "uploadlogpagetext" ) );
 536         $da = wfMsg( "uploadedimage", "[[:" . $wgLang->getNsText(
 537           Namespace::getImage() ) . ":{$name}|{$name}]]" );
 538         $ta = wfMsg( "uploadedimage", $name );
 539         $log->addEntry( $da, $desc, $ta );
 540 }
 541
 542
 543 /* Some generic result counters, pulled out of SearchEngine */
 544
 545 function wfShowingResults( $offset, $limit )
 546 {
 547         return wfMsg( "showingresults", $limit, $offset+1 );
 548 }
 549
 550 function wfShowingResultsNum( $offset, $limit, $num )
 551 {
 552         return wfMsg( "showingresultsnum", $limit, $offset+1, $num );
 553 }
 554
 555 function wfViewPrevNext( $offset, $limit, $link, $query = "" )
 556 {
 557         global $wgUser;
 558         $prev = wfMsg( "prevn", $limit );
 559         $next = wfMsg( "nextn", $limit );
 560
 561         $sk = $wgUser->getSkin();
 562         if ( 0 != $offset ) {
 563                 $po = $offset - $limit;
 564                 if ( $po < 0 ) { $po = 0; }
 565                 $q = "limit={$limit}&offset={$po}";
 566                 if ( "" != $query ) { $q .= "&{$query}"; }
 567                 $plink = "<a href=\"" . wfLocalUrlE( $link, $q ) . "\">{$prev}</a>";
 568         } else { $plink = $prev; }
 569
 570         $no = $offset + $limit;
 571         $q = "limit={$limit}&offset={$no}";
 572         if ( "" != $query ) { $q .= "&{$query}"; }
 573
 574         $nlink = "<a href=\"" . wfLocalUrlE( $link, $q ) . "\">{$next}</a>";
 575         $nums = wfNumLink( $offset, 20, $link , $query ) . " | " .
 576           wfNumLink( $offset, 50, $link, $query ) . " | " .
 577           wfNumLink( $offset, 100, $link, $query ) . " | " .
 578           wfNumLink( $offset, 250, $link, $query ) . " | " .
 579           wfNumLink( $offset, 500, $link, $query );
 580
 581         return wfMsg( "viewprevnext", $plink, $nlink, $nums );
 582 }
 583
 584 function wfNumLink( $offset, $limit, $link, $query = "" )
 585 {
 586         global $wgUser;
 587         if ( "" == $query ) { $q = ""; }
 588         else { $q = "{$query}&"; }
 589         $q .= "limit={$limit}&offset={$offset}";
 590
 591         $s = "<a href=\"" . wfLocalUrlE( $link, $q ) . "\">{$limit}</a>";
 592         return $s;
 593 }
 594
 595 function wfClientAcceptsGzip() {
 596         global $wgUseGzip;
 597         if( $wgUseGzip ) {
 598                 # FIXME: we may want to blacklist some broken browsers
 599                 if( preg_match(
 600                         '/\bgzip(?:;(q)=([0-9]+(?:\.[0-9]+)))?\b/',
 601                         $_SERVER["HTTP_ACCEPT_ENCODING"],
 602                         $m ) ) {
 603                         if( ( $m[1] == "q" ) && ( $m[2] == 0 ) ) return false;
 604                         wfDebug( " accepts gzip\n" );
 605                         return true;
 606                 }
 607         }
 608         return false;
 609 }
 610
 611 # Yay, more global functions!
 612 function wfCheckLimits( $deflimit = 50, $optionname = "rclimit" ) {
 613         global $wgUser;
 614
 615         $limit = (int)$_REQUEST['limit'];
 616         if( $limit < 0 ) $limit = 0;
 617         if( ( $limit == 0 ) && ( $optionname != "" ) ) {
 618                 $limit = (int)$wgUser->getOption( $optionname );
 619         }
 620         if( $limit <= 0 ) $limit = $deflimit;
 621         if( $limit > 5000 ) $limit = 5000; # We have *some* limits...
 622
 623         $offset = (int)$_REQUEST['offset'];
 624         $offset = (int)$offset;
 625         if( $offset < 0 ) $offset = 0;
 626         if( $offset > 65000 ) $offset = 65000; # do we need a max? what?
 627
 628         return array( $limit, $offset );
 629 }
 630
 631 # Escapes the given text so that it may be output using addWikiText()
 632 # without any linking, formatting, etc. making its way through. This
 633 # is achieved by substituting certain characters with HTML entities.
 634 # As required by the callers, <nowiki> is not used. It currently does
 635 # not filter out characters which have special meaning only at the
 636 # start of a line, such as "*".
 637 function wfEscapeWikiText( $text )
 638 {
 639         $text = str_replace(
 640                 array( '[',     '|',      "'",     'ISBN '    , '://'     , "\n=" ),
 641                 array( '&#91;', '&#124;', '&#39;', 'ISBN&#32;', '&#58;//' , "\n&#61;" ),
 642                 htmlspecialchars($text) );
 643         return $text;
 644 }
 645
 646 function wfQuotedPrintable( $string, $charset = "" )
 647 {
 648         # Probably incomplete; see RFC 2045
 649         if( empty( $charset ) ) {
 650                 global $wgInputEncoding;
 651                 $charset = $wgInputEncoding;
 652         }
 653         $charset = strtoupper( $charset );
 654         $charset = str_replace( "ISO-8859", "ISO8859", $charset ); // ?
 655
 656         $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
 657         $replace = $illegal . '\t ?_';
 658         if( !preg_match( "/[$illegal]/", $string ) ) return $string;
 659         $out = "=?$charset?Q?";
 660         $out .= preg_replace( "/([$replace])/e", 'sprintf("=%02X",ord("$1"))', $string );
 661         $out .= "?=";
 662         return $out;
 663 }
 664
 665 # Changes the first character to an HTML entity
 666 function wfHtmlEscapeFirst( $text ) {
 667         $ord = ord($text);
 668         $newText = substr($text, 1);
 669         return "&#$ord;$newText";
 670 }
 671
 672 function wfSetVar( &$dest, $source )
 673 {
 674         $temp = $dest;
 675         $dest = $source;
 676         return $temp;
 677 }
 678
 679 function &wfSetRef( &$dest, $source )
 680 {
 681         $temp =& $dest;
 682         $dest =& $source;
 683         return $temp;
 684 }
 685
 686 ?>