includes/GlobalFunctions.php

   1 <?php
   2 # Global functions used everywhere
   3
   4 $wgNumberOfArticles = -1; # Unset
   5 $wgTotalViews = -1;
   6 $wgTotalEdits = -1;
   7
   8 require_once( 'DatabaseFunctions.php' );
   9 require_once( 'UpdateClasses.php' );
  10 require_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 if( !function_exists('is_a') ) {
  40         # Exists in PHP 4.2.0+
  41         function is_a( $object, $class_name ) {
  42                 return
  43                         (strcasecmp( get_class( $object, $class_name ) == 0) ||
  44                          is_subclass_of( $object, $class_name ) );
  45         }
  46 }
  47
  48 # html_entity_decode exists in PHP 4.3.0+ but is FATALLY BROKEN even then,
  49 # with no UTF-8 support.
  50 function do_html_entity_decode( $string, $quote_style=ENT_COMPAT, $charset='ISO-8859-1' ) {
  51         static $trans;
  52         if( !isset( $trans ) ) {
  53                 $trans = array_flip( get_html_translation_table( HTML_ENTITIES, $quote_style ) );
  54                 # Assumes $charset will always be the same through a run, and only understands
  55                 # utf-8 or default. Note - mixing latin1 named entities and unicode numbered
  56                 # ones will result in a bad link.
  57                 if( strcasecmp( 'utf-8', $charset ) == 0 ) {
  58                         $trans = array_map( 'utf8_encode', $trans );
  59                 }
  60         }
  61         return strtr( $string, $trans );
  62 }
  63
  64 $wgRandomSeeded = false;
  65
  66 function wfSeedRandom()
  67 {
  68         global $wgRandomSeeded;
  69
  70         if ( ! $wgRandomSeeded ) {
  71                 $seed = hexdec(substr(md5(microtime()),-8)) & 0x7fffffff;
  72                 mt_srand( $seed );
  73                 $wgRandomSeeded = true;
  74         }
  75 }
  76
  77 # Generates a URL from a URL-encoded title and a query string
  78 # Title::getLocalURL() is preferred in most cases
  79 #
  80 function wfLocalUrl( $a, $q = '' )
  81 {
  82         global $wgServer, $wgScript, $wgArticlePath;
  83
  84         $a = str_replace( ' ', '_', $a );
  85
  86         if ( '' == $a ) {
  87                 if( '' == $q ) {
  88                         $a = $wgScript;
  89                 } else {
  90                         $a = "{$wgScript}?{$q}";
  91                 }
  92         } else if ( '' == $q ) {
  93                 $a = str_replace( "$1", $a, $wgArticlePath );
  94         } else if ($wgScript != '' ) {
  95                 $a = "{$wgScript}?title={$a}&{$q}";
  96         } else { //XXX hackish solution for toplevel wikis
  97                 $a = "/{$a}?{$q}";
  98         }
  99         return $a;
 100 }
 101
 102 function wfLocalUrlE( $a, $q = '' )
 103 {
 104         return wfEscapeHTML( wfLocalUrl( $a, $q ) );
 105         # die( "Call to obsolete function wfLocalUrlE()" );
 106 }
 107
 108 function wfFullUrl( $a, $q = '' ) {
 109         wfDebugDieBacktrace( 'Call to obsolete function wfFullUrl(); use Title::getFullURL' );
 110 }
 111
 112 function wfFullUrlE( $a, $q = '' ) {
 113         wfDebugDieBacktrace( 'Call to obsolete function wfFullUrlE(); use Title::getFullUrlE' );
 114
 115 }
 116
 117 // orphan function wfThumbUrl( $img )
 118 //{
 119 //      global $wgUploadPath;
 120 //
 121 //      $nt = Title::newFromText( $img );
 122 //      if( !$nt ) return "";
 123 //
 124 //      $name = $nt->getDBkey();
 125 //      $hash = md5( $name );
 126 //
 127 //      $url = "{$wgUploadPath}/thumb/" . $hash{0} . "/" .
 128 //        substr( $hash, 0, 2 ) . "/{$name}";
 129 //      return wfUrlencode( $url );
 130 //}
 131
 132
 133 function wfImageArchiveUrl( $name )
 134 {
 135         global $wgUploadPath;
 136
 137         $hash = md5( substr( $name, 15) );
 138         $url = "{$wgUploadPath}/archive/" . $hash{0} . "/" .
 139           substr( $hash, 0, 2 ) . "/{$name}";
 140         return wfUrlencode($url);
 141 }
 142
 143 function wfUrlencode ( $s )
 144 {
 145         $s = urlencode( $s );
 146         $s = preg_replace( '/%3[Aa]/', ':', $s );
 147         $s = preg_replace( '/%2[Ff]/', '/', $s );
 148
 149         return $s;
 150 }
 151
 152 function wfUtf8Sequence($codepoint) {
 153         if($codepoint <     0x80) return chr($codepoint);
 154         if($codepoint <    0x800) return chr($codepoint >>  6 & 0x3f | 0xc0) .
 155                                      chr($codepoint       & 0x3f | 0x80);
 156     if($codepoint <  0x10000) return chr($codepoint >> 12 & 0x0f | 0xe0) .
 157                                      chr($codepoint >>  6 & 0x3f | 0x80) .
 158                                      chr($codepoint       & 0x3f | 0x80);
 159         if($codepoint < 0x100000) return chr($codepoint >> 18 & 0x07 | 0xf0) . # Double-check this
 160                                          chr($codepoint >> 12 & 0x3f | 0x80) .
 161                                      chr($codepoint >>  6 & 0x3f | 0x80) .
 162                                      chr($codepoint       & 0x3f | 0x80);
 163         # Doesn't yet handle outside the BMP
 164         return "&#$codepoint;";
 165 }
 166
 167 # Converts numeric character entities to UTF-8
 168 function wfMungeToUtf8($string) {
 169         global $wgInputEncoding; # This is debatable
 170         #$string = iconv($wgInputEncoding, "UTF-8", $string);
 171         $string = preg_replace ( '/&#([0-9]+);/e', 'wfUtf8Sequence($1)', $string );
 172         $string = preg_replace ( '/&#x([0-9a-f]+);/ie', 'wfUtf8Sequence(0x$1)', $string );
 173         # Should also do named entities here
 174         return $string;
 175 }
 176
 177 # Converts a single UTF-8 character into the corresponding HTML character entity
 178 function wfUtf8Entity( $matches ) {
 179         $char = $matches[0];
 180         # Find the length
 181         $z = ord( $char{0} );
 182         if ( $z & 0x80 ) {
 183                 $length = 0;
 184                 while ( $z & 0x80 ) {
 185                         $length++;
 186                         $z <<= 1;
 187                 }
 188         } else {
 189                 $length = 1;
 190         }
 191
 192         if ( $length != strlen( $char ) ) {
 193                 return '';
 194         }
 195         if ( $length == 1 ) {
 196                 return $char;
 197         }
 198
 199         # Mask off the length-determining bits and shift back to the original location
 200         $z &= 0xff;
 201         $z >>= $length;
 202
 203         # Add in the free bits from subsequent bytes
 204         for ( $i=1; $i<$length; $i++ ) {
 205                 $z <<= 6;
 206                 $z |= ord( $char{$i} ) & 0x3f;
 207         }
 208
 209         # Make entity
 210         return "&#$z;";
 211 }
 212
 213 # Converts all multi-byte characters in a UTF-8 string into the appropriate character entity
 214 function wfUtf8ToHTML($string) {
 215         return preg_replace_callback( '/[\\xc0-\\xfd][\\x80-\\xbf]*/', 'wfUtf8Entity', $string );
 216 }
 217
 218 function wfDebug( $text, $logonly = false )
 219 {
 220         global $wgOut, $wgDebugLogFile, $wgDebugComments, $wgProfileOnly;
 221
 222         if ( isset( $wgOut ) && $wgDebugComments && !$logonly ) {
 223                 $wgOut->debug( $text );
 224         }
 225         if ( "" != $wgDebugLogFile && !$wgProfileOnly ) {
 226                 error_log( $text, 3, $wgDebugLogFile );
 227         }
 228 }
 229
 230 function logProfilingData()
 231 {
 232         global $wgRequestTime, $wgDebugLogFile;
 233         global $wgProfiling, $wgProfileStack, $wgProfileLimit, $wgUser;
 234         $now = wfTime();
 235
 236         list( $usec, $sec ) = explode( " ", $wgRequestTime );
 237         $start = (float)$sec + (float)$usec;
 238         $elapsed = $now - $start;
 239         if ( $wgProfiling ) {
 240                 $prof = wfGetProfilingOutput( $start, $elapsed );
 241                 $forward = '';
 242                 if( !empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) )
 243                         $forward = ' forwarded for ' . $_SERVER['HTTP_X_FORWARDED_FOR'];
 244                 if( !empty( $_SERVER['HTTP_CLIENT_IP'] ) )
 245                         $forward .= ' client IP ' . $_SERVER['HTTP_CLIENT_IP'];
 246                 if( !empty( $_SERVER['HTTP_FROM'] ) )
 247                         $forward .= ' from ' . $_SERVER['HTTP_FROM'];
 248                 if( $forward )
 249                         $forward = "\t(proxied via {$_SERVER['REMOTE_ADDR']}{$forward})";
 250                 if($wgUser->getId() == 0)
 251                         $forward .= ' anon';
 252                 $log = sprintf( "%s\t%04.3f\t%s\n",
 253                   gmdate( 'YmdHis' ), $elapsed,
 254                   urldecode( $_SERVER['REQUEST_URI'] . $forward ) );
 255                 if ( '' != $wgDebugLogFile ) {
 256                         error_log( $log . $prof, 3, $wgDebugLogFile );
 257                 }
 258         }
 259 }
 260
 261
 262 function wfReadOnly()
 263 {
 264         global $wgReadOnlyFile;
 265
 266         if ( "" == $wgReadOnlyFile ) { return false; }
 267         return is_file( $wgReadOnlyFile );
 268 }
 269
 270 $wgReplacementKeys = array( "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9" );
 271
 272 # Get a message from anywhere
 273 function wfMsg( $key ) {
 274         $args = func_get_args();
 275         if ( count( $args ) ) {
 276                 array_shift( $args );
 277         }
 278         return wfMsgReal( $key, $args, true );
 279 }
 280
 281 # Get a message from the language file
 282 function wfMsgNoDB( $key ) {
 283         $args = func_get_args();
 284         if ( count( $args ) ) {
 285                 array_shift( $args );
 286         }
 287         return wfMsgReal( $key, $args, false );
 288 }
 289
 290 # Really get a message
 291 function wfMsgReal( $key, $args, $useDB ) {
 292         global $wgReplacementKeys, $wgMessageCache, $wgLang;
 293
 294         $fname = 'wfMsg';
 295         wfProfileIn( $fname );
 296         if ( $wgMessageCache ) {
 297                 $message = $wgMessageCache->get( $key, $useDB );
 298         } elseif ( $wgLang ) {
 299                 $message = $wgLang->getMessage( $key );
 300         } else {
 301                 wfDebug( "No language object when getting $key\n" );
 302                 $message = "&lt;$key&gt;";
 303         }
 304
 305         # Replace arguments
 306         if( count( $args ) ) {
 307                 $message = str_replace( $wgReplacementKeys, $args, $message );
 308         }
 309         wfProfileOut( $fname );
 310         return $message;
 311 }
 312
 313 function wfCleanFormFields( $fields )
 314 {
 315         wfDebugDieBacktrace( 'Call to obsolete wfCleanFormFields(). Use wgRequest instead...' );
 316 }
 317
 318 function wfMungeQuotes( $in )
 319 {
 320         $out = str_replace( '%', '%25', $in );
 321         $out = str_replace( "'", '%27', $out );
 322         $out = str_replace( '"', '%22', $out );
 323         return $out;
 324 }
 325
 326 function wfDemungeQuotes( $in )
 327 {
 328         $out = str_replace( '%22', '"', $in );
 329         $out = str_replace( '%27', "'", $out );
 330         $out = str_replace( '%25', '%', $out );
 331         return $out;
 332 }
 333
 334 function wfCleanQueryVar( $var )
 335 {
 336         wfDebugDieBacktrace( 'Call to obsolete function wfCleanQueryVar(); use wgRequest instead' );
 337 }
 338
 339 function wfSearch( $s )
 340 {
 341         $se = new SearchEngine( $s );
 342         $se->showResults();
 343 }
 344
 345 function wfGo( $s )
 346 { # pick the nearest match
 347         $se = new SearchEngine( $s );
 348         $se->goResult();
 349 }
 350
 351 # Just like exit() but makes a note of it.
 352 function wfAbruptExit(){
 353         static $called = false;
 354         if ( $called ){
 355                 exit();
 356         }
 357         $called = true;
 358
 359         if( function_exists( 'debug_backtrace' ) ){ // PHP >= 4.3
 360                 $bt = debug_backtrace();
 361                 for($i = 0; $i < count($bt) ; $i++){
 362                         $file = $bt[$i]['file'];
 363                         $line = $bt[$i]['line'];
 364                         wfDebug("WARNING: Abrupt exit in $file at line $line\n");
 365                 }
 366         } else {
 367                 wfDebug('WARNING: Abrupt exit\n');
 368         }
 369         exit();
 370 }
 371
 372 function wfDebugDieBacktrace( $msg = '' ) {
 373         $msg .= "\n<p>Backtrace:</p>\n<ul>\n";
 374         $backtrace = debug_backtrace();
 375         foreach( $backtrace as $call ) {
 376                 $f = explode( DIRECTORY_SEPARATOR, $call['file'] );
 377                 $file = $f[count($f)-1];
 378                 $msg .= '<li>' . $file . " line " . $call['line'] . ', in ';
 379                 if( !empty( $call['class'] ) ) $msg .= $call['class'] . '::';
 380                 $msg .= $call['function'] . "()</li>\n";
 381         }
 382         die( $msg );
 383 }
 384
 385 function wfNumberOfArticles()
 386 {
 387         global $wgNumberOfArticles;
 388
 389         wfLoadSiteStats();
 390         return $wgNumberOfArticles;
 391 }
 392
 393 /* private */ function wfLoadSiteStats()
 394 {
 395         global $wgNumberOfArticles, $wgTotalViews, $wgTotalEdits;
 396         if ( -1 != $wgNumberOfArticles ) return;
 397
 398         $sql = 'SELECT ss_total_views, ss_total_edits, ss_good_articles ' .
 399           'FROM site_stats WHERE ss_row_id=1';
 400         $res = wfQuery( $sql, DB_READ, 'wfLoadSiteStats' );
 401
 402         if ( 0 == wfNumRows( $res ) ) { return; }
 403         else {
 404                 $s = wfFetchObject( $res );
 405                 $wgTotalViews = $s->ss_total_views;
 406                 $wgTotalEdits = $s->ss_total_edits;
 407                 $wgNumberOfArticles = $s->ss_good_articles;
 408         }
 409 }
 410
 411 function wfEscapeHTML( $in )
 412 {
 413         return str_replace(
 414                 array( '&', '"', '>', '<' ),
 415                 array( '&amp;', '&quot;', '&gt;', '&lt;' ),
 416                 $in );
 417 }
 418
 419 function wfEscapeHTMLTagsOnly( $in ) {
 420         return str_replace(
 421                 array( '"', '>', '<' ),
 422                 array( '&quot;', '&gt;', '&lt;' ),
 423                 $in );
 424 }
 425
 426 function wfUnescapeHTML( $in )
 427 {
 428         $in = str_replace( '&lt;', '<', $in );
 429         $in = str_replace( '&gt;', '>', $in );
 430         $in = str_replace( '&quot;', '"', $in );
 431         $in = str_replace( '&amp;', '&', $in );
 432         return $in;
 433 }
 434
 435 function wfImageDir( $fname )
 436 {
 437         global $wgUploadDirectory;
 438
 439         $hash = md5( $fname );
 440         $oldumask = umask(0);
 441         $dest = $wgUploadDirectory . '/' . $hash{0};
 442         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
 443         $dest .= '/' . substr( $hash, 0, 2 );
 444         if ( ! is_dir( $dest ) ) { mkdir( $dest, 0777 ); }
 445
 446         umask( $oldumask );
 447         return $dest;
 448 }
 449
 450 function wfImageThumbDir( $fname , $subdir='thumb')
 451 {
 452         return wfImageArchiveDir( $fname, $subdir );
 453 }
 454
 455 function wfImageArchiveDir( $fname , $subdir='archive')
 456 {
 457         global $wgUploadDirectory;
 458
 459         $hash = md5( $fname );
 460         $oldumask = umask(0);
 461
 462         # Suppress warning messages here; if the file itself can't
 463         # be written we'll worry about it then.
 464         $archive = "{$wgUploadDirectory}/{$subdir}";
 465         if ( ! is_dir( $archive ) ) { @mkdir( $archive, 0777 ); }
 466         $archive .= '/' . $hash{0};
 467         if ( ! is_dir( $archive ) ) { @mkdir( $archive, 0777 ); }
 468         $archive .= '/' . substr( $hash, 0, 2 );
 469         if ( ! is_dir( $archive ) ) { @mkdir( $archive, 0777 ); }
 470
 471         umask( $oldumask );
 472         return $archive;
 473 }
 474
 475 function wfRecordUpload( $name, $oldver, $size, $desc, $copyStatus = "", $source = "" )
 476 {
 477         global $wgUser, $wgLang, $wgTitle, $wgOut, $wgDeferredUpdateList;
 478         global $wgUseCopyrightUpload;
 479
 480         $fname = 'wfRecordUpload';
 481
 482         $sql = 'SELECT img_name,img_size,img_timestamp,img_description,img_user,' .
 483           "img_user_text FROM image WHERE img_name='" . wfStrencode( $name ) . "'";
 484         $res = wfQuery( $sql, DB_READ, $fname );
 485
 486         $now = wfTimestampNow();
 487         $won = wfInvertTimestamp( $now );
 488         $size = IntVal( $size );
 489
 490         if ( $wgUseCopyrightUpload )
 491           {
 492             $textdesc = '== ' . wfMsg ( 'filedesc' ) . " ==\n" . $desc . "\n" .
 493               '== ' . wfMsg ( 'filestatus' ) . " ==\n" . $copyStatus . "\n" .
 494               '== ' . wfMsg ( 'filesource' ) . " ==\n" . $source ;
 495           }
 496         else $textdesc = $desc ;
 497
 498         $now = wfTimestampNow();
 499         $won = wfInvertTimestamp( $now );
 500
 501         if ( 0 == wfNumRows( $res ) ) {
 502                 $sql = 'INSERT INTO image (img_name,img_size,img_timestamp,' .
 503                   "img_description,img_user,img_user_text) VALUES ('" .
 504                   wfStrencode( $name ) . "',$size,'{$now}','" .
 505                   wfStrencode( $desc ) . "', '" . $wgUser->getID() .
 506                   "', '" . wfStrencode( $wgUser->getName() ) . "')";
 507                 wfQuery( $sql, DB_WRITE, $fname );
 508
 509                 $sql = 'SELECT cur_id,cur_text FROM cur WHERE cur_namespace=' .
 510                   Namespace::getImage() . " AND cur_title='" .
 511                   wfStrencode( $name ) . "'";
 512                 $res = wfQuery( $sql, DB_READ, $fname );
 513                 if ( 0 == wfNumRows( $res ) ) {
 514             $common =
 515                           Namespace::getImage() . ",'" .
 516                           wfStrencode( $name ) . "','" .
 517                           wfStrencode( $desc ) . "','" . $wgUser->getID() . "','" .
 518                           wfStrencode( $wgUser->getName() ) . "','" . $now .
 519                           "',1";
 520                         $sql = 'INSERT INTO cur (cur_namespace,cur_title,' .
 521                           'cur_comment,cur_user,cur_user_text,cur_timestamp,cur_is_new,' .
 522                           'cur_text,inverse_timestamp,cur_touched) VALUES (' .
 523                           $common .
 524                           ",'" . wfStrencode( $textdesc ) . "','{$won}','{$now}')";
 525                         wfQuery( $sql, DB_WRITE, $fname );
 526                         $id = wfInsertId() or 0; # We should throw an error instead
 527
 528                         $titleObj = Title::makeTitle( NS_IMAGE, $name );
 529                         RecentChange::notifyNew( $now, $titleObj, 0, $wgUser, $desc );
 530
 531                         $u = new SearchUpdate( $id, $name, $desc );
 532                         $u->doUpdate();
 533                 }
 534         } else {
 535                 $s = wfFetchObject( $res );
 536
 537                 $sql = 'INSERT INTO oldimage (oi_name,oi_archive_name,oi_size,' .
 538                   "oi_timestamp,oi_description,oi_user,oi_user_text) VALUES ('" .
 539                   wfStrencode( $s->img_name ) . "','" .
 540                   wfStrencode( $oldver ) .
 541                   "',{$s->img_size},'{$s->img_timestamp}','" .
 542                   wfStrencode( $s->img_description ) . "','" .
 543                   wfStrencode( $s->img_user ) . "','" .
 544                   wfStrencode( $s->img_user_text) . "')";
 545                 wfQuery( $sql, DB_WRITE, $fname );
 546
 547                 $sql = "UPDATE image SET img_size={$size}," .
 548                   "img_timestamp='" . wfTimestampNow() . "',img_user='" .
 549                   $wgUser->getID() . "',img_user_text='" .
 550                   wfStrencode( $wgUser->getName() ) . "', img_description='" .
 551                   wfStrencode( $desc ) . "' WHERE img_name='" .
 552                   wfStrencode( $name ) . "'";
 553                 wfQuery( $sql, DB_WRITE, $fname );
 554
 555                 $sql = "UPDATE cur SET cur_touched='{$now}' WHERE cur_namespace=" .
 556                   Namespace::getImage() . " AND cur_title='" .
 557                   wfStrencode( $name ) . "'";
 558                 wfQuery( $sql, DB_WRITE, $fname );
 559         }
 560
 561         $log = new LogPage( wfMsg( 'uploadlogpage' ), wfMsg( 'uploadlogpagetext' ) );
 562         $da = wfMsg( 'uploadedimage', '[[:' . $wgLang->getNsText(
 563           Namespace::getImage() ) . ":{$name}|{$name}]]" );
 564         $ta = wfMsg( 'uploadedimage', $name );
 565         $log->addEntry( $da, $desc, $ta );
 566 }
 567
 568
 569 /* Some generic result counters, pulled out of SearchEngine */
 570
 571 function wfShowingResults( $offset, $limit )
 572 {
 573         global $wgLang;
 574         return wfMsg( 'showingresults', $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ) );
 575 }
 576
 577 function wfShowingResultsNum( $offset, $limit, $num )
 578 {
 579         global $wgLang;
 580         return wfMsg( 'showingresultsnum', $wgLang->formatNum( $limit ), $wgLang->formatNum( $offset+1 ), $wgLang->formatNum( $num ) );
 581 }
 582
 583 function wfViewPrevNext( $offset, $limit, $link, $query = '', $atend = false )
 584 {
 585         global $wgUser, $wgLang;
 586         $fmtLimit = $wgLang->formatNum( $limit );
 587         $prev = wfMsg( 'prevn', $fmtLimit );
 588         $next = wfMsg( 'nextn', $fmtLimit );
 589         $link = wfUrlencode( $link );
 590
 591         $sk = $wgUser->getSkin();
 592         if ( 0 != $offset ) {
 593                 $po = $offset - $limit;
 594                 if ( $po < 0 ) { $po = 0; }
 595                 $q = "limit={$limit}&offset={$po}";
 596                 if ( '' != $query ) { $q .= "&{$query}"; }
 597                 $plink = '<a href="' . wfLocalUrlE( $link, $q ) . "\">{$prev}</a>";
 598         } else { $plink = $prev; }
 599
 600         $no = $offset + $limit;
 601         $q = "limit={$limit}&offset={$no}";
 602         if ( "" != $query ) { $q .= "&{$query}"; }
 603
 604         if ( $atend ) {
 605                 $nlink = $next;
 606         } else {
 607                 $nlink = '<a href="' . wfLocalUrlE( $link, $q ) . "\">{$next}</a>";
 608         }
 609         $nums = wfNumLink( $offset, 20, $link , $query ) . ' | ' .
 610           wfNumLink( $offset, 50, $link, $query ) . ' | ' .
 611           wfNumLink( $offset, 100, $link, $query ) . ' | ' .
 612           wfNumLink( $offset, 250, $link, $query ) . ' | ' .
 613           wfNumLink( $offset, 500, $link, $query );
 614
 615         return wfMsg( 'viewprevnext', $plink, $nlink, $nums );
 616 }
 617
 618 function wfNumLink( $offset, $limit, $link, $query = '' )
 619 {
 620         global $wgUser, $wgLang;
 621         if ( '' == $query ) { $q = ''; }
 622         else { $q = "{$query}&"; }
 623         $q .= "limit={$limit}&offset={$offset}";
 624
 625         $fmtLimit = $wgLang->formatNum( $limit );
 626         $s = '<a href="' . wfLocalUrlE( $link, $q ) . "\">{$fmtLimit}</a>";
 627         return $s;
 628 }
 629
 630 function wfClientAcceptsGzip() {
 631         global $wgUseGzip;
 632         if( $wgUseGzip ) {
 633                 # FIXME: we may want to blacklist some broken browsers
 634                 if( preg_match(
 635                         '/\bgzip(?:;(q)=([0-9]+(?:\.[0-9]+)))?\b/',
 636                         $_SERVER['HTTP_ACCEPT_ENCODING'],
 637                         $m ) ) {
 638                         if( ( $m[1] == 'q' ) && ( $m[2] == 0 ) ) return false;
 639                         wfDebug( " accepts gzip\n" );
 640                         return true;
 641                 }
 642         }
 643         return false;
 644 }
 645
 646 # Yay, more global functions!
 647 function wfCheckLimits( $deflimit = 50, $optionname = 'rclimit' ) {
 648         global $wgUser, $wgRequest;
 649
 650         $limit = $wgRequest->getInt( 'limit', 0 );
 651         if( $limit < 0 ) $limit = 0;
 652         if( ( $limit == 0 ) && ( $optionname != '' ) ) {
 653                 $limit = (int)$wgUser->getOption( $optionname );
 654         }
 655         if( $limit <= 0 ) $limit = $deflimit;
 656         if( $limit > 5000 ) $limit = 5000; # We have *some* limits...
 657
 658         $offset = $wgRequest->getInt( 'offset', 0 );
 659         if( $offset < 0 ) $offset = 0;
 660         if( $offset > 65000 ) $offset = 65000; # do we need a max? what?
 661
 662         return array( $limit, $offset );
 663 }
 664
 665 # Escapes the given text so that it may be output using addWikiText()
 666 # without any linking, formatting, etc. making its way through. This
 667 # is achieved by substituting certain characters with HTML entities.
 668 # As required by the callers, <nowiki> is not used. It currently does
 669 # not filter out characters which have special meaning only at the
 670 # start of a line, such as "*".
 671 function wfEscapeWikiText( $text )
 672 {
 673         $text = str_replace(
 674                 array( '[',     '|',      "'",     'ISBN '    , '://'     , "\n=" ),
 675                 array( '&#91;', '&#124;', '&#39;', 'ISBN&#32;', '&#58;//' , "\n&#61;" ),
 676                 htmlspecialchars($text) );
 677         return $text;
 678 }
 679
 680 function wfQuotedPrintable( $string, $charset = '' )
 681 {
 682         # Probably incomplete; see RFC 2045
 683         if( empty( $charset ) ) {
 684                 global $wgInputEncoding;
 685                 $charset = $wgInputEncoding;
 686         }
 687         $charset = strtoupper( $charset );
 688         $charset = str_replace( 'ISO-8859', 'ISO8859', $charset ); // ?
 689
 690         $illegal = '\x00-\x08\x0b\x0c\x0e-\x1f\x7f-\xff=';
 691         $replace = $illegal . '\t ?_';
 692         if( !preg_match( "/[$illegal]/", $string ) ) return $string;
 693         $out = "=?$charset?Q?";
 694         $out .= preg_replace( "/([$replace])/e", 'sprintf("=%02X",ord("$1"))', $string );
 695         $out .= '?=';
 696         return $out;
 697 }
 698
 699 function wfTime(){
 700         $st = explode( ' ', microtime() );
 701         return (float)$st[0] + (float)$st[1];
 702 }
 703
 704 # Changes the first character to an HTML entity
 705 function wfHtmlEscapeFirst( $text ) {
 706         $ord = ord($text);
 707         $newText = substr($text, 1);
 708         return "&#$ord;$newText";
 709 }
 710
 711 # Sets dest to source and returns the original value of dest
 712 function wfSetVar( &$dest, $source )
 713 {
 714         $temp = $dest;
 715         $dest = $source;
 716         return $temp;
 717 }
 718
 719 # Sets dest to a reference to source and returns the original dest
 720 # Pity that doesn't work in PHP
 721 function &wfSetRef( &$dest, &$source )
 722 {
 723         die( "You can't rebind a variable in the caller's scope" );
 724 }
 725
 726 # This function takes two arrays as input, and returns a CGI-style string, e.g.
 727 # "days=7&limit=100". Options in the first array override options in the second.
 728 # Options set to "" will not be output.
 729 function wfArrayToCGI( $array1, $array2 = NULL )
 730 {
 731         if ( !is_null( $array2 ) ) {
 732                 $array1 = $array1 + $array2;
 733         }
 734
 735         $cgi = '';
 736         foreach ( $array1 as $key => $value ) {
 737                 if ( '' !== $value ) {
 738                         if ( '' != $cgi ) {
 739                                 $cgi .= '&';
 740                         }
 741                         $cgi .= "{$key}={$value}";
 742                 }
 743         }
 744         return $cgi;
 745 }
 746
 747 # This is obsolete, use SquidUpdate::purge()
 748 function wfPurgeSquidServers ($urlArr) {
 749         SquidUpdate::purge( $urlArr );
 750 }
 751
 752 # Windows-compatible version of escapeshellarg()
 753 function wfEscapeShellArg( )
 754 {
 755         $args = func_get_args();
 756         $first = true;
 757         $retVal = '';
 758         foreach ( $args as $arg ) {
 759                 if ( !$first ) {
 760                         $retVal .= ' ';
 761                 } else {
 762                         $first = false;
 763                 }
 764
 765                 if ( isWindows() ) {
 766                         $retVal .= '"' . str_replace( '"','\"', $arg ) . '"';
 767                 } else {
 768                         $retVal .= escapeshellarg( $arg );
 769                 }
 770         }
 771         return $retVal;
 772 }
 773
 774 # wfMerge attempts to merge differences between three texts.
 775 # Returns true for a clean merge and false for failure or a conflict.
 776
 777 function wfMerge( $old, $mine, $yours, &$result ){
 778         global $wgDiff3;
 779
 780         # This check may also protect against code injection in
 781         # case of broken installations.
 782         if(! file_exists( $wgDiff3 ) ){
 783                 return false;
 784         }
 785
 786         # Make temporary files
 787         $td = '/tmp/';
 788         $oldtextFile = fopen( $oldtextName = tempnam( $td, 'merge-old-' ), 'w' );
 789         $mytextFile = fopen( $mytextName = tempnam( $td, 'merge-mine-' ), 'w' );
 790         $yourtextFile = fopen( $yourtextName = tempnam( $td, 'merge-your-' ), 'w' );
 791
 792         fwrite( $oldtextFile, $old ); fclose( $oldtextFile );
 793         fwrite( $mytextFile, $mine ); fclose( $mytextFile );
 794         fwrite( $yourtextFile, $yours ); fclose( $yourtextFile );
 795
 796         # Check for a conflict
 797     $cmd = wfEscapeShellArg( $wgDiff3 ) . ' -a --overlap-only ' .
 798       wfEscapeShellArg( $mytextName ) . ' ' .
 799       wfEscapeShellArg( $oldtextName ) . ' ' .
 800       wfEscapeShellArg( $yourtextName );
 801     $handle = popen( $cmd, 'r' );
 802
 803         if( fgets( $handle ) ){
 804                 $conflict = true;
 805         } else {
 806                 $conflict = false;
 807         }
 808         pclose( $handle );
 809
 810         # Merge differences
 811         $cmd = wfEscapeShellArg( $wgDiff3 ) . ' -a -e --merge ' .
 812           wfEscapeShellArg( $mytextName, $oldtextName, $yourtextName );
 813         $handle = popen( $cmd, 'r' );
 814         $result = '';
 815         do {
 816                 $data = fread( $handle, 8192 );
 817                 if ( strlen( $data ) == 0 ) {
 818                         break;
 819                 }
 820                 $result .= $data;
 821         } while ( true );
 822         pclose( $handle );
 823         unlink( $mytextName ); unlink( $oldtextName ); unlink( $yourtextName );
 824         return ! $conflict;
 825 }
 826
 827 function wfVarDump( $var )
 828 {
 829         global $wgOut;
 830         $s = str_replace("\n","<br>\n", var_export( $var, true ) . "\n");
 831         if ( headers_sent() || !@is_object( $wgOut ) ) {
 832                 print $s;
 833         } else {
 834                 $wgOut->addHTML( $s );
 835         }
 836 }
 837
 838 # Provide a simple HTTP error.
 839 function wfHttpError( $code, $label, $desc ) {
 840         global $wgOut;
 841         $wgOut->disable();
 842         header( "HTTP/1.0 $code $label" );
 843         header( "Status: $code $label" );
 844         $wgOut->sendCacheControl();
 845
 846         # Don't send content if it's a HEAD request.
 847         if( $_SERVER['REQUEST_METHOD'] == 'HEAD' ) {
 848                 header( 'Content-type: text/plain' );
 849                 print "$desc\n";
 850         }
 851 }
 852
 853 # Converts an Accept-* header into an array mapping string values to quality factors
 854 function wfAcceptToPrefs( $accept, $def = '*/*' ) {
 855         # No arg means accept anything (per HTTP spec)
 856         if( !$accept ) {
 857                 return array( $def => 1 );
 858         }
 859
 860         $prefs = array();
 861
 862         $parts = explode( ',', $accept );
 863
 864         foreach( $parts as $part ) {
 865                 # FIXME: doesn't deal with params like 'text/html; level=1'
 866                 @list( $value, $qpart ) = explode( ';', $part );
 867                 if( !isset( $qpart ) ) {
 868                         $prefs[$value] = 1;
 869                 } elseif( preg_match( '/q\s*=\s*(\d*\.\d+)/', $qpart, $match ) ) {
 870                         $prefs[$value] = $match[1];
 871                 }
 872         }
 873
 874         return $prefs;
 875 }
 876
 877 /* private */ function mimeTypeMatch( $type, $avail ) {
 878         if( array_key_exists($type, $avail) ) {
 879                 return $type;
 880         } else {
 881                 $parts = explode( '/', $type );
 882                 if( array_key_exists( $parts[0] . '/*', $avail ) ) {
 883                         return $parts[0] . '/*';
 884                 } elseif( array_key_exists( '*/*', $avail ) ) {
 885                         return '*/*';
 886                 } else {
 887                         return NULL;
 888                 }
 889         }
 890 }
 891
 892 # FIXME: doesn't handle params like 'text/plain; charset=UTF-8'
 893 # XXX: generalize to negotiate other stuff
 894 function wfNegotiateType( $cprefs, $sprefs ) {
 895         $combine = array();
 896
 897         foreach( array_keys($sprefs) as $type ) {
 898                 $parts = explode( '/', $type );
 899                 if( $parts[1] != '*' ) {
 900                         $ckey = mimeTypeMatch( $type, $cprefs );
 901                         if( $ckey ) {
 902                                 $combine[$type] = $sprefs[$type] * $cprefs[$ckey];
 903                         }
 904                 }
 905         }
 906
 907         foreach( array_keys( $cprefs ) as $type ) {
 908                 $parts = explode( '/', $type );
 909                 if( $parts[1] != '*' && !array_key_exists( $type, $sprefs ) ) {
 910                         $skey = mimeTypeMatch( $type, $sprefs );
 911                         if( $skey ) {
 912                                 $combine[$type] = $sprefs[$skey] * $cprefs[$type];
 913                         }
 914                 }
 915         }
 916
 917         $bestq = 0;
 918         $besttype = NULL;
 919
 920         foreach( array_keys( $combine ) as $type ) {
 921                 if( $combine[$type] > $bestq ) {
 922                         $besttype = $type;
 923                         $bestq = $combine[$type];
 924                 }
 925         }
 926
 927         return $besttype;
 928 }
 929
 930 # Array lookup
 931 # Returns an array where the values in the first array are replaced by the
 932 # values in the second array with the corresponding keys
 933 function wfArrayLookup( $a, $b )
 934 {
 935         return array_flip( array_intersect( array_flip( $a ), array_keys( $b ) ) );
 936 }
 937
 938 # Since Windows is so different to any of the other popular OSes, it seems appropriate
 939 # to have a simple way to test for its presence
 940 function wfIsWindows() {
 941         if (substr(php_uname(), 0, 7) == 'Windows') {
 942                 return true;
 943         } else {
 944                 return false;
 945         }
 946 }
 947
 948 ?>