includes/Title.php

   1 <?php
   2 /**
   3  * See title.txt
   4  *
   5  * @package MediaWiki
   6  */
   7
   8 /** */
   9 require_once( 'normal/UtfNormal.php' );
  10
  11 $wgTitleInterwikiCache = array();
  12 $wgTitleCache = array();
  13
  14 define ( 'GAID_FOR_UPDATE', 1 );
  15
  16 # Title::newFromTitle maintains a cache to avoid
  17 # expensive re-normalization of commonly used titles.
  18 # On a batch operation this can become a memory leak
  19 # if not bounded. After hitting this many titles,
  20 # reset the cache.
  21 define( 'MW_TITLECACHE_MAX', 1000 );
  22
  23 /**
  24  * Title class
  25  * - Represents a title, which may contain an interwiki designation or namespace
  26  * - Can fetch various kinds of data from the database, albeit inefficiently.
  27  *
  28  * @package MediaWiki
  29  */
  30 class Title {
  31         /**
  32          * All member variables should be considered private
  33          * Please use the accessor functions
  34          */
  35
  36          /**#@+
  37          * @access private
  38          */
  39
  40         var $mTextform;           # Text form (spaces not underscores) of the main part
  41         var $mUrlform;            # URL-encoded form of the main part
  42         var $mDbkeyform;          # Main part with underscores
  43         var $mNamespace;          # Namespace index, i.e. one of the NS_xxxx constants
  44         var $mInterwiki;          # Interwiki prefix (or null string)
  45         var $mFragment;           # Title fragment (i.e. the bit after the #)
  46         var $mArticleID;          # Article ID, fetched from the link cache on demand
  47         var $mLatestID;         # ID of most recent revision
  48         var $mRestrictions;       # Array of groups allowed to edit this article
  49                               # Only null or "sysop" are supported
  50         var $mRestrictionsLoaded; # Boolean for initialisation on demand
  51         var $mPrefixedText;       # Text form including namespace/interwiki, initialised on demand
  52         var $mDefaultNamespace;   # Namespace index when there is no namespace
  53                               # Zero except in {{transclusion}} tags
  54         var $mWatched;            # Is $wgUser watching this page? NULL if unfilled, accessed through userIsWatching()
  55         /**#@-*/
  56
  57
  58         /**
  59          * Constructor
  60          * @access private
  61          */
  62         /* private */ function Title() {
  63                 $this->mInterwiki = $this->mUrlform =
  64                 $this->mTextform = $this->mDbkeyform = '';
  65                 $this->mArticleID = -1;
  66                 $this->mNamespace = NS_MAIN;
  67                 $this->mRestrictionsLoaded = false;
  68                 $this->mRestrictions = array();
  69                 # Dont change the following, NS_MAIN is hardcoded in several place
  70                 # See bug #696
  71                 $this->mDefaultNamespace = NS_MAIN;
  72                 $this->mWatched = NULL;
  73                 $this->mLatestID = false;
  74         }
  75
  76         /**
  77          * Create a new Title from a prefixed DB key
  78          * @param string $key The database key, which has underscores
  79          *      instead of spaces, possibly including namespace and
  80          *      interwiki prefixes
  81          * @return Title the new object, or NULL on an error
  82          * @static
  83          * @access public
  84          */
  85         /* static */ function newFromDBkey( $key ) {
  86                 $t = new Title();
  87                 $t->mDbkeyform = $key;
  88                 if( $t->secureAndSplit() )
  89                         return $t;
  90                 else
  91                         return NULL;
  92         }
  93
  94         /**
  95          * Create a new Title from text, such as what one would
  96          * find in a link. Decodes any HTML entities in the text.
  97          *
  98          * @param string $text the link text; spaces, prefixes,
  99          *      and an initial ':' indicating the main namespace
 100          *      are accepted
 101          * @param int $defaultNamespace the namespace to use if
 102          *      none is specified by a prefix
 103          * @return Title the new object, or NULL on an error
 104          * @static
 105          * @access public
 106          */
 107         function newFromText( $text, $defaultNamespace = NS_MAIN ) {
 108                 global $wgTitleCache;
 109                 $fname = 'Title::newFromText';
 110                 wfProfileIn( $fname );
 111
 112                 if( is_object( $text ) ) {
 113                         wfDebugDieBacktrace( 'Title::newFromText given an object' );
 114                 }
 115
 116                 /**
 117                  * Wiki pages often contain multiple links to the same page.
 118                  * Title normalization and parsing can become expensive on
 119                  * pages with many links, so we can save a little time by
 120                  * caching them.
 121                  *
 122                  * In theory these are value objects and won't get changed...
 123                  */
 124                 if( $defaultNamespace == NS_MAIN && isset( $wgTitleCache[$text] ) ) {
 125                         wfProfileOut( $fname );
 126                         return $wgTitleCache[$text];
 127                 }
 128
 129                 /**
 130                  * Convert things like &eacute; &#257; or &#x3017; into real text...
 131                  */
 132                 $filteredText = Sanitizer::decodeCharReferences( $text );
 133
 134                 $t =& new Title();
 135                 $t->mDbkeyform = str_replace( ' ', '_', $filteredText );
 136                 $t->mDefaultNamespace = $defaultNamespace;
 137
 138                 if( $t->secureAndSplit() ) {
 139                         if( $defaultNamespace == NS_MAIN ) {
 140                                 if( count( $wgTitleCache ) >= MW_TITLECACHE_MAX ) {
 141                                         # Avoid memory leaks on mass operations...
 142                                         $wgTitleCache = array();
 143                                 }
 144                                 $wgTitleCache[$text] =& $t;
 145                         }
 146                         wfProfileOut( $fname );
 147                         return $t;
 148                 } else {
 149                         wfProfileOut( $fname );
 150                         $ret = NULL;
 151                         return $ret;
 152                 }
 153         }
 154
 155         /**
 156          * Create a new Title from URL-encoded text. Ensures that
 157          * the given title's length does not exceed the maximum.
 158          * @param string $url the title, as might be taken from a URL
 159          * @return Title the new object, or NULL on an error
 160          * @static
 161          * @access public
 162          */
 163         function newFromURL( $url ) {
 164                 $t = new Title();
 165
 166                 # For compatibility with old buggy URLs. "+" is not valid in titles,
 167                 # but some URLs used it as a space replacement and they still come
 168                 # from some external search tools.
 169                 $s = str_replace( '+', ' ', $url );
 170
 171                 $t->mDbkeyform = str_replace( ' ', '_', $s );
 172                 if( $t->secureAndSplit() ) {
 173                         return $t;
 174                 } else {
 175                         return NULL;
 176                 }
 177         }
 178
 179         /**
 180          * Create a new Title from an article ID
 181          *
 182          * @todo This is inefficiently implemented, the page row is requested
 183          *       but not used for anything else
 184          *
 185          * @param int $id the page_id corresponding to the Title to create
 186          * @return Title the new object, or NULL on an error
 187          * @access public
 188          * @static
 189          */
 190         function newFromID( $id ) {
 191                 $fname = 'Title::newFromID';
 192                 $dbr =& wfGetDB( DB_SLAVE );
 193                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 194                         array( 'page_id' => $id ), $fname );
 195                 if ( $row !== false ) {
 196                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 197                 } else {
 198                         $title = NULL;
 199                 }
 200                 return $title;
 201         }
 202
 203         /**
 204          * Create a new Title from a namespace index and a DB key.
 205          * It's assumed that $ns and $title are *valid*, for instance when
 206          * they came directly from the database or a special page name.
 207          * For convenience, spaces are converted to underscores so that
 208          * eg user_text fields can be used directly.
 209          *
 210          * @param int $ns the namespace of the article
 211          * @param string $title the unprefixed database key form
 212          * @return Title the new object
 213          * @static
 214          * @access public
 215          */
 216         function &makeTitle( $ns, $title ) {
 217                 $t =& new Title();
 218                 $t->mInterwiki = '';
 219                 $t->mFragment = '';
 220                 $t->mNamespace = intval( $ns );
 221                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 222                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 223                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 224                 $t->mTextform = str_replace( '_', ' ', $title );
 225                 return $t;
 226         }
 227
 228         /**
 229          * Create a new Title frrom a namespace index and a DB key.
 230          * The parameters will be checked for validity, which is a bit slower
 231          * than makeTitle() but safer for user-provided data.
 232          *
 233          * @param int $ns the namespace of the article
 234          * @param string $title the database key form
 235          * @return Title the new object, or NULL on an error
 236          * @static
 237          * @access public
 238          */
 239         function makeTitleSafe( $ns, $title ) {
 240                 $t = new Title();
 241                 $t->mDbkeyform = Title::makeName( $ns, $title );
 242                 if( $t->secureAndSplit() ) {
 243                         return $t;
 244                 } else {
 245                         return NULL;
 246                 }
 247         }
 248
 249         /**
 250          * Create a new Title for the Main Page
 251          *
 252          * @static
 253          * @return Title the new object
 254          * @access public
 255          */
 256         function newMainPage() {
 257                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 258         }
 259
 260         /**
 261          * Create a new Title for a redirect
 262          * @param string $text the redirect title text
 263          * @return Title the new object, or NULL if the text is not a
 264          *      valid redirect
 265          * @static
 266          * @access public
 267          */
 268         function newFromRedirect( $text ) {
 269                 global $wgMwRedir;
 270                 $rt = NULL;
 271                 if ( $wgMwRedir->matchStart( $text ) ) {
 272                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 273                                 # categories are escaped using : for example one can enter:
 274                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 275                                 if ( substr($m[1],0,1) == ':') {
 276                                         # We don't want to keep the ':'
 277                                         $m[1] = substr( $m[1], 1 );
 278                                 }
 279
 280                                 $rt = Title::newFromText( $m[1] );
 281                                 # Disallow redirects to Special:Userlogout
 282                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 283                                         $rt = NULL;
 284                                 }
 285                         }
 286                 }
 287                 return $rt;
 288         }
 289
 290 #----------------------------------------------------------------------------
 291 #       Static functions
 292 #----------------------------------------------------------------------------
 293
 294         /**
 295          * Get the prefixed DB key associated with an ID
 296          * @param int $id the page_id of the article
 297          * @return Title an object representing the article, or NULL
 298          *      if no such article was found
 299          * @static
 300          * @access public
 301          */
 302         function nameOf( $id ) {
 303                 $fname = 'Title::nameOf';
 304                 $dbr =& wfGetDB( DB_SLAVE );
 305
 306                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 307                 if ( $s === false ) { return NULL; }
 308
 309                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 310                 return $n;
 311         }
 312
 313         /**
 314          * Get a regex character class describing the legal characters in a link
 315          * @return string the list of characters, not delimited
 316          * @static
 317          * @access public
 318          */
 319         function legalChars() {
 320                 global $wgLegalTitleChars;
 321                 return $wgLegalTitleChars;
 322         }
 323
 324         /**
 325          * Get a string representation of a title suitable for
 326          * including in a search index
 327          *
 328          * @param int $ns a namespace index
 329          * @param string $title text-form main part
 330          * @return string a stripped-down title string ready for the
 331          *      search index
 332          */
 333         /* static */ function indexTitle( $ns, $title ) {
 334                 global $wgContLang;
 335                 require_once( 'SearchEngine.php' );
 336
 337                 $lc = SearchEngine::legalSearchChars() . '&#;';
 338                 $t = $wgContLang->stripForSearch( $title );
 339                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 340                 $t = strtolower( $t );
 341
 342                 # Handle 's, s'
 343                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 344                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 345
 346                 $t = preg_replace( "/\\s+/", ' ', $t );
 347
 348                 if ( $ns == NS_IMAGE ) {
 349                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 350                 }
 351                 return trim( $t );
 352         }
 353
 354         /*
 355          * Make a prefixed DB key from a DB key and a namespace index
 356          * @param int $ns numerical representation of the namespace
 357          * @param string $title the DB key form the title
 358          * @return string the prefixed form of the title
 359          */
 360         /* static */ function makeName( $ns, $title ) {
 361                 global $wgContLang;
 362
 363                 $n = $wgContLang->getNsText( $ns );
 364                 return $n == '' ? $title : "$n:$title";
 365         }
 366
 367         /**
 368          * Returns the URL associated with an interwiki prefix
 369          * @param string $key the interwiki prefix (e.g. "MeatBall")
 370          * @return the associated URL, containing "$1", which should be
 371          *      replaced by an article title
 372          * @static (arguably)
 373          * @access public
 374          */
 375         function getInterwikiLink( $key )  {
 376                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 377                 $fname = 'Title::getInterwikiLink';
 378
 379                 wfProfileIn( $fname );
 380
 381                 $key = strtolower( $key );
 382
 383                 $k = $wgDBname.':interwiki:'.$key;
 384                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 385                         wfProfileOut( $fname );
 386                         return $wgTitleInterwikiCache[$k]->iw_url;
 387                 }
 388
 389                 $s = $wgMemc->get( $k );
 390                 # Ignore old keys with no iw_local
 391                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 392                         $wgTitleInterwikiCache[$k] = $s;
 393                         wfProfileOut( $fname );
 394                         return $s->iw_url;
 395                 }
 396
 397                 $dbr =& wfGetDB( DB_SLAVE );
 398                 $res = $dbr->select( 'interwiki',
 399                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 400                         array( 'iw_prefix' => $key ), $fname );
 401                 if( !$res ) {
 402                         wfProfileOut( $fname );
 403                         return '';
 404                 }
 405
 406                 $s = $dbr->fetchObject( $res );
 407                 if( !$s ) {
 408                         # Cache non-existence: create a blank object and save it to memcached
 409                         $s = (object)false;
 410                         $s->iw_url = '';
 411                         $s->iw_local = 0;
 412                         $s->iw_trans = 0;
 413                 }
 414                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 415                 $wgTitleInterwikiCache[$k] = $s;
 416
 417                 wfProfileOut( $fname );
 418                 return $s->iw_url;
 419         }
 420
 421         /**
 422          * Determine whether the object refers to a page within
 423          * this project.
 424          *
 425          * @return bool TRUE if this is an in-project interwiki link
 426          *      or a wikilink, FALSE otherwise
 427          * @access public
 428          */
 429         function isLocal() {
 430                 global $wgTitleInterwikiCache, $wgDBname;
 431
 432                 if ( $this->mInterwiki != '' ) {
 433                         # Make sure key is loaded into cache
 434                         $this->getInterwikiLink( $this->mInterwiki );
 435                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 436                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 437                 } else {
 438                         return true;
 439                 }
 440         }
 441
 442         /**
 443          * Determine whether the object refers to a page within
 444          * this project and is transcludable.
 445          *
 446          * @return bool TRUE if this is transcludable
 447          * @access public
 448          */
 449         function isTrans() {
 450                 global $wgTitleInterwikiCache, $wgDBname;
 451
 452                 if ($this->mInterwiki == '' || !$this->isLocal())
 453                         return false;
 454                 # Make sure key is loaded into cache
 455                 $this->getInterwikiLink( $this->mInterwiki );
 456                 $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 457                 return (bool)($wgTitleInterwikiCache[$k]->iw_trans);
 458         }
 459
 460         /**
 461          * Update the page_touched field for an array of title objects
 462          * @todo Inefficient unless the IDs are already loaded into the
 463          *      link cache
 464          * @param array $titles an array of Title objects to be touched
 465          * @param string $timestamp the timestamp to use instead of the
 466          *      default current time
 467          * @static
 468          * @access public
 469          */
 470         function touchArray( $titles, $timestamp = '' ) {
 471
 472                 if ( count( $titles ) == 0 ) {
 473                         return;
 474                 }
 475                 $dbw =& wfGetDB( DB_MASTER );
 476                 if ( $timestamp == '' ) {
 477                         $timestamp = $dbw->timestamp();
 478                 }
 479                 /*
 480                 $page = $dbw->tableName( 'page' );
 481                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 482                 $first = true;
 483
 484                 foreach ( $titles as $title ) {
 485                         if ( $wgUseFileCache ) {
 486                                 $cm = new CacheManager($title);
 487                                 @unlink($cm->fileCacheName());
 488                         }
 489
 490                         if ( ! $first ) {
 491                                 $sql .= ',';
 492                         }
 493                         $first = false;
 494                         $sql .= $title->getArticleID();
 495                 }
 496                 $sql .= ')';
 497                 if ( ! $first ) {
 498                         $dbw->query( $sql, 'Title::touchArray' );
 499                 }
 500                 */
 501                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 502                 // do them in small chunks:
 503                 $fname = 'Title::touchArray';
 504                 foreach( $titles as $title ) {
 505                         $dbw->update( 'page',
 506                                 array( 'page_touched' => $timestamp ),
 507                                 array(
 508                                         'page_namespace' => $title->getNamespace(),
 509                                         'page_title'     => $title->getDBkey() ),
 510                                 $fname );
 511                 }
 512         }
 513
 514 #----------------------------------------------------------------------------
 515 #       Other stuff
 516 #----------------------------------------------------------------------------
 517
 518         /** Simple accessors */
 519         /**
 520          * Get the text form (spaces not underscores) of the main part
 521          * @return string
 522          * @access public
 523          */
 524         function getText() { return $this->mTextform; }
 525         /**
 526          * Get the URL-encoded form of the main part
 527          * @return string
 528          * @access public
 529          */
 530         function getPartialURL() { return $this->mUrlform; }
 531         /**
 532          * Get the main part with underscores
 533          * @return string
 534          * @access public
 535          */
 536         function getDBkey() { return $this->mDbkeyform; }
 537         /**
 538          * Get the namespace index, i.e. one of the NS_xxxx constants
 539          * @return int
 540          * @access public
 541          */
 542         function getNamespace() { return $this->mNamespace; }
 543         /**
 544          * Get the namespace text
 545          * @return string
 546          * @access public
 547          */
 548         function getNsText() {
 549                 global $wgContLang;
 550                 return $wgContLang->getNsText( $this->mNamespace );
 551         }
 552         /**
 553          * Get the namespace text of the subject (rather than talk) page
 554          * @return string
 555          * @access public
 556          */
 557         function getSubjectNsText() {
 558                 global $wgContLang;
 559                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 560         }
 561
 562         /**
 563          * Get the interwiki prefix (or null string)
 564          * @return string
 565          * @access public
 566          */
 567         function getInterwiki() { return $this->mInterwiki; }
 568         /**
 569          * Get the Title fragment (i.e. the bit after the #)
 570          * @return string
 571          * @access public
 572          */
 573         function getFragment() { return $this->mFragment; }
 574         /**
 575          * Get the default namespace index, for when there is no namespace
 576          * @return int
 577          * @access public
 578          */
 579         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 580
 581         /**
 582          * Get title for search index
 583          * @return string a stripped-down title string ready for the
 584          *      search index
 585          */
 586         function getIndexTitle() {
 587                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 588         }
 589
 590         /**
 591          * Get the prefixed database key form
 592          * @return string the prefixed title, with underscores and
 593          *      any interwiki and namespace prefixes
 594          * @access public
 595          */
 596         function getPrefixedDBkey() {
 597                 $s = $this->prefix( $this->mDbkeyform );
 598                 $s = str_replace( ' ', '_', $s );
 599                 return $s;
 600         }
 601
 602         /**
 603          * Get the prefixed title with spaces.
 604          * This is the form usually used for display
 605          * @return string the prefixed title, with spaces
 606          * @access public
 607          */
 608         function getPrefixedText() {
 609                 global $wgContLang;
 610                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 611                         $s = $this->prefix( $this->mTextform );
 612                         $s = str_replace( '_', ' ', $s );
 613                         $this->mPrefixedText = $s;
 614                 }
 615                 return $this->mPrefixedText;
 616         }
 617
 618         /**
 619          * Get the prefixed title with spaces, plus any fragment
 620          * (part beginning with '#')
 621          * @return string the prefixed title, with spaces and
 622          *      the fragment, including '#'
 623          * @access public
 624          */
 625         function getFullText() {
 626                 global $wgContLang;
 627                 $text = $this->getPrefixedText();
 628                 if( '' != $this->mFragment ) {
 629                         $text .= '#' . $this->mFragment;
 630                 }
 631                 return $text;
 632         }
 633
 634         /**
 635          * Get a URL-encoded title (not an actual URL) including interwiki
 636          * @return string the URL-encoded form
 637          * @access public
 638          */
 639         function getPrefixedURL() {
 640                 $s = $this->prefix( $this->mDbkeyform );
 641                 $s = str_replace( ' ', '_', $s );
 642
 643                 $s = wfUrlencode ( $s ) ;
 644
 645                 # Cleaning up URL to make it look nice -- is this safe?
 646                 $s = str_replace( '%28', '(', $s );
 647                 $s = str_replace( '%29', ')', $s );
 648
 649                 return $s;
 650         }
 651
 652         /**
 653          * Get a real URL referring to this title, with interwiki link and
 654          * fragment
 655          *
 656          * @param string $query an optional query string, not used
 657          *      for interwiki links
 658          * @return string the URL
 659          * @access public
 660          */
 661         function getFullURL( $query = '' ) {
 662                 global $wgContLang, $wgServer;
 663
 664                 if ( '' == $this->mInterwiki ) {
 665                         $url = $wgServer . $this->getLocalUrl( $query );
 666                 } else {
 667                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 668
 669                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 670                         if ( '' != $namespace ) {
 671                                 # Can this actually happen? Interwikis shouldn't be parsed.
 672                                 $namespace .= ':';
 673                         }
 674                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 675                         if( $query != '' ) {
 676                                 if( false === strpos( $url, '?' ) ) {
 677                                         $url .= '?';
 678                                 } else {
 679                                         $url .= '&';
 680                                 }
 681                                 $url .= $query;
 682                         }
 683                         if ( '' != $this->mFragment ) {
 684                                 $url .= '#' . $this->mFragment;
 685                         }
 686                 }
 687                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 688                 return $url;
 689         }
 690
 691         /**
 692          * Get a URL with no fragment or server name.  If this page is generated
 693          * with action=render, $wgServer is prepended.
 694          * @param string $query an optional query string; if not specified,
 695          *      $wgArticlePath will be used.
 696          * @return string the URL
 697          * @access public
 698          */
 699         function getLocalURL( $query = '' ) {
 700                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 701
 702                 if ( $this->isExternal() ) {
 703                         $url = $this->getFullURL();
 704                 } else {
 705                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 706                         if ( $query == '' ) {
 707                                 $url = str_replace( '$1', $dbkey, $wgArticlePath );
 708                         } else {
 709                                 global $wgActionPaths;
 710                                 $url = false;
 711                                 if( !empty( $wgActionPaths ) &&
 712                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 713                                 {
 714                                         $action = urldecode( $matches[2] );
 715                                         if( isset( $wgActionPaths[$action] ) ) {
 716                                                 $query = $matches[1];
 717                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 718                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 719                                                 if( $query != '' ) $url .= '?' . $query;
 720                                         }
 721                                 }
 722                                 if ( $url === false ) {
 723                                         if ( $query == '-' ) {
 724                                                 $query = '';
 725                                         }
 726                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 727                                 }
 728                         }
 729
 730                         if ($wgRequest->getText('action') == 'render') {
 731                                 $url = $wgServer . $url;
 732                         }
 733                 }
 734                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 735                 return $url;
 736         }
 737
 738         /**
 739          * Get an HTML-escaped version of the URL form, suitable for
 740          * using in a link, without a server name or fragment
 741          * @param string $query an optional query string
 742          * @return string the URL
 743          * @access public
 744          */
 745         function escapeLocalURL( $query = '' ) {
 746                 return htmlspecialchars( $this->getLocalURL( $query ) );
 747         }
 748
 749         /**
 750          * Get an HTML-escaped version of the URL form, suitable for
 751          * using in a link, including the server name and fragment
 752          *
 753          * @return string the URL
 754          * @param string $query an optional query string
 755          * @access public
 756          */
 757         function escapeFullURL( $query = '' ) {
 758                 return htmlspecialchars( $this->getFullURL( $query ) );
 759         }
 760
 761         /**
 762          * Get the URL form for an internal link.
 763          * - Used in various Squid-related code, in case we have a different
 764          * internal hostname for the server from the exposed one.
 765          *
 766          * @param string $query an optional query string
 767          * @return string the URL
 768          * @access public
 769          */
 770         function getInternalURL( $query = '' ) {
 771                 global $wgInternalServer;
 772                 $url = $wgInternalServer . $this->getLocalURL( $query );
 773                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 774                 return $url;
 775         }
 776
 777         /**
 778          * Get the edit URL for this Title
 779          * @return string the URL, or a null string if this is an
 780          *      interwiki link
 781          * @access public
 782          */
 783         function getEditURL() {
 784                 global $wgServer, $wgScript;
 785
 786                 if ( '' != $this->mInterwiki ) { return ''; }
 787                 $s = $this->getLocalURL( 'action=edit' );
 788
 789                 return $s;
 790         }
 791
 792         /**
 793          * Get the HTML-escaped displayable text form.
 794          * Used for the title field in <a> tags.
 795          * @return string the text, including any prefixes
 796          * @access public
 797          */
 798         function getEscapedText() {
 799                 return htmlspecialchars( $this->getPrefixedText() );
 800         }
 801
 802         /**
 803          * Is this Title interwiki?
 804          * @return boolean
 805          * @access public
 806          */
 807         function isExternal() { return ( '' != $this->mInterwiki ); }
 808
 809         /**
 810          * Does the title correspond to a protected article?
 811          * @param string $what the action the page is protected from,
 812          *      by default checks move and edit
 813          * @return boolean
 814          * @access public
 815          */
 816         function isProtected($action = '') {
 817                 if ( -1 == $this->mNamespace ) { return true; }
 818                 if($action == 'edit' || $action == '') {
 819                         $a = $this->getRestrictions("edit");
 820                         if ( in_array( 'sysop', $a ) ) { return true; }
 821                 }
 822                 if($action == 'move' || $action == '') {
 823                         $a = $this->getRestrictions("move");
 824                         if ( in_array( 'sysop', $a ) ) { return true; }
 825                 }
 826                 return false;
 827         }
 828
 829         /**
 830          * Is $wgUser is watching this page?
 831          * @return boolean
 832          * @access public
 833          */
 834         function userIsWatching() {
 835                 global $wgUser;
 836
 837                 if ( is_null( $this->mWatched ) ) {
 838                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 839                                 $this->mWatched = false;
 840                         } else {
 841                                 $this->mWatched = $wgUser->isWatched( $this );
 842                         }
 843                 }
 844                 return $this->mWatched;
 845         }
 846
 847         /**
 848          * Can $wgUser perform $action this page?
 849          * @param string $action action that permission needs to be checked for
 850          * @return boolean
 851          * @access private
 852          */
 853         function userCan($action) {
 854                 $fname = 'Title::userCan';
 855                 wfProfileIn( $fname );
 856
 857                 global $wgUser;
 858                 if( NS_SPECIAL == $this->mNamespace ) {
 859                         wfProfileOut( $fname );
 860                         return false;
 861                 }
 862                 // XXX: This is the code that prevents unprotecting a page in NS_MEDIAWIKI
 863                 // from taking effect -ævar
 864                 if( NS_MEDIAWIKI == $this->mNamespace &&
 865                     !$wgUser->isAllowed('editinterface') ) {
 866                         wfProfileOut( $fname );
 867                         return false;
 868                 }
 869
 870                 if( $this->mDbkeyform == '_' ) {
 871                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 872                         wfProfileOut( $fname );
 873                         return false;
 874                 }
 875
 876                 # protect global styles and js
 877                 if ( NS_MEDIAWIKI == $this->mNamespace
 878                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 879                      && !$wgUser->isAllowed('editinterface') ) {
 880                         wfProfileOut( $fname );
 881                         return false;
 882                 }
 883
 884                 # protect css/js subpages of user pages
 885                 # XXX: this might be better using restrictions
 886                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 887                 if( NS_USER == $this->mNamespace
 888                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 889                         && !$wgUser->isAllowed('editinterface')
 890                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 891                         wfProfileOut( $fname );
 892                         return false;
 893                 }
 894
 895                 foreach( $this->getRestrictions($action) as $right ) {
 896                         // Backwards compatibility, rewrite sysop -> protect
 897                         if ( $right == 'sysop' ) {
 898                                 $right = 'protect';
 899                         }
 900                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 901                                 wfProfileOut( $fname );
 902                                 return false;
 903                         }
 904                 }
 905
 906                 if( $action == 'move' &&
 907                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
 908                         wfProfileOut( $fname );
 909                         return false;
 910                 }
 911
 912                 if( $action == 'create' ) {
 913                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
 914                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
 915                                 return false;
 916                         }
 917                 }
 918
 919                 wfProfileOut( $fname );
 920                 return true;
 921         }
 922
 923         /**
 924          * Can $wgUser edit this page?
 925          * @return boolean
 926          * @access public
 927          */
 928         function userCanEdit() {
 929                 return $this->userCan('edit');
 930         }
 931
 932         /**
 933          * Can $wgUser move this page?
 934          * @return boolean
 935          * @access public
 936          */
 937         function userCanMove() {
 938                 return $this->userCan('move');
 939         }
 940
 941         /**
 942          * Would anybody with sufficient privileges be able to move this page?
 943          * Some pages just aren't movable.
 944          *
 945          * @return boolean
 946          * @access public
 947          */
 948         function isMovable() {
 949                 return Namespace::isMovable( $this->getNamespace() )
 950                         && $this->getInterwiki() == '';
 951         }
 952
 953         /**
 954          * Can $wgUser read this page?
 955          * @return boolean
 956          * @access public
 957          */
 958         function userCanRead() {
 959                 global $wgUser;
 960
 961                 if( $wgUser->isAllowed('read') ) {
 962                         return true;
 963                 } else {
 964                         global $wgWhitelistRead;
 965
 966                         /** If anon users can create an account,
 967                             they need to reach the login page first! */
 968                         if( $wgUser->isAllowed( 'createaccount' )
 969                             && $this->getNamespace() == NS_SPECIAL
 970                             && $this->getText() == 'Userlogin' ) {
 971                                 return true;
 972                         }
 973
 974                         /** some pages are explicitly allowed */
 975                         $name = $this->getPrefixedText();
 976                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
 977                                 return true;
 978                         }
 979
 980                         # Compatibility with old settings
 981                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
 982                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 983                                         return true;
 984                                 }
 985                         }
 986                 }
 987                 return false;
 988         }
 989
 990         /**
 991          * Is this a talk page of some sort?
 992          * @return bool
 993          * @access public
 994          */
 995         function isTalkPage() {
 996                 return Namespace::isTalk( $this->getNamespace() );
 997         }
 998
 999         /**
1000          * Is this a .css or .js subpage of a user page?
1001          * @return bool
1002          * @access public
1003          */
1004         function isCssJsSubpage() {
1005                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1006         }
1007         /**
1008          * Is this a .css subpage of a user page?
1009          * @return bool
1010          * @access public
1011          */
1012         function isCssSubpage() {
1013                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1014         }
1015         /**
1016          * Is this a .js subpage of a user page?
1017          * @return bool
1018          * @access public
1019          */
1020         function isJsSubpage() {
1021                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1022         }
1023         /**
1024          * Protect css/js subpages of user pages: can $wgUser edit
1025          * this page?
1026          *
1027          * @return boolean
1028          * @todo XXX: this might be better using restrictions
1029          * @access public
1030          */
1031         function userCanEditCssJsSubpage() {
1032                 global $wgUser;
1033                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1034         }
1035
1036         /**
1037          * Loads a string into mRestrictions array
1038          * @param string $res restrictions in string format
1039          * @access public
1040          */
1041         function loadRestrictions( $res ) {
1042                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1043                         $temp = explode( '=', trim( $restrict ) );
1044                         if(count($temp) == 1) {
1045                                 // old format should be treated as edit/move restriction
1046                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1047                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1048                         } else {
1049                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1050                         }
1051                 }
1052                 $this->mRestrictionsLoaded = true;
1053         }
1054
1055         /**
1056          * Accessor/initialisation for mRestrictions
1057          * @param string $action action that permission needs to be checked for
1058          * @return array the array of groups allowed to edit this article
1059          * @access public
1060          */
1061         function getRestrictions($action) {
1062                 $id = $this->getArticleID();
1063                 if ( 0 == $id ) { return array(); }
1064
1065                 if ( ! $this->mRestrictionsLoaded ) {
1066                         $dbr =& wfGetDB( DB_SLAVE );
1067                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1068                         $this->loadRestrictions( $res );
1069                 }
1070                 if( isset( $this->mRestrictions[$action] ) ) {
1071                         return $this->mRestrictions[$action];
1072                 }
1073                 return array();
1074         }
1075
1076         /**
1077          * Is there a version of this page in the deletion archive?
1078          * @return int the number of archived revisions
1079          * @access public
1080          */
1081         function isDeleted() {
1082                 $fname = 'Title::isDeleted';
1083                 if ( $this->getNamespace() < 0 ) {
1084                         $n = 0;
1085                 } else {
1086                         $dbr =& wfGetDB( DB_SLAVE );
1087                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1088                                 'ar_title' => $this->getDBkey() ), $fname );
1089                 }
1090                 return (int)$n;
1091         }
1092
1093         /**
1094          * Get the article ID for this Title from the link cache,
1095          * adding it if necessary
1096          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1097          *      for update
1098          * @return int the ID
1099          * @access public
1100          */
1101         function getArticleID( $flags = 0 ) {
1102                 global $wgLinkCache;
1103                 if ( $flags & GAID_FOR_UPDATE ) {
1104                         $oldUpdate = $wgLinkCache->forUpdate( true );
1105                         $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1106                         $wgLinkCache->forUpdate( $oldUpdate );
1107                 } else {
1108                         if ( -1 == $this->mArticleID ) {
1109                                 $this->mArticleID = $wgLinkCache->addLinkObj( $this );
1110                         }
1111                 }
1112                 return $this->mArticleID;
1113         }
1114
1115         function getLatestRevID() {
1116                 if ($this->mLatestID !== false)
1117                         return $this->mLatestID;
1118
1119                 $db =& wfGetDB(DB_SLAVE);
1120                 return $this->mLatestID = $db->selectField( 'revision',
1121                         "max(rev_id)",
1122                         array('rev_page' => $this->getArticleID()),
1123                         'Title::getLatestRevID' );
1124         }
1125
1126         /**
1127          * This clears some fields in this object, and clears any associated
1128          * keys in the "bad links" section of $wgLinkCache.
1129          *
1130          * - This is called from Article::insertNewArticle() to allow
1131          * loading of the new page_id. It's also called from
1132          * Article::doDeleteArticle()
1133          *
1134          * @param int $newid the new Article ID
1135          * @access public
1136          */
1137         function resetArticleID( $newid ) {
1138                 global $wgLinkCache;
1139                 $wgLinkCache->clearBadLink( $this->getPrefixedDBkey() );
1140
1141                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1142                 else { $this->mArticleID = $newid; }
1143                 $this->mRestrictionsLoaded = false;
1144                 $this->mRestrictions = array();
1145         }
1146
1147         /**
1148          * Updates page_touched for this page; called from LinksUpdate.php
1149          * @return bool true if the update succeded
1150          * @access public
1151          */
1152         function invalidateCache() {
1153                 global $wgUseFileCache;
1154
1155                 if ( wfReadOnly() ) {
1156                         return;
1157                 }
1158
1159                 $dbw =& wfGetDB( DB_MASTER );
1160                 $success = $dbw->update( 'page',
1161                         array( /* SET */
1162                                 'page_touched' => $dbw->timestamp()
1163                         ), array( /* WHERE */
1164                                 'page_namespace' => $this->getNamespace() ,
1165                                 'page_title' => $this->getDBkey()
1166                         ), 'Title::invalidateCache'
1167                 );
1168
1169                 if ($wgUseFileCache) {
1170                         $cache = new CacheManager($this);
1171                         @unlink($cache->fileCacheName());
1172                 }
1173
1174                 return $success;
1175         }
1176
1177         /**
1178          * Prefix some arbitrary text with the namespace or interwiki prefix
1179          * of this object
1180          *
1181          * @param string $name the text
1182          * @return string the prefixed text
1183          * @access private
1184          */
1185         /* private */ function prefix( $name ) {
1186                 global $wgContLang;
1187
1188                 $p = '';
1189                 if ( '' != $this->mInterwiki ) {
1190                         $p = $this->mInterwiki . ':';
1191                 }
1192                 if ( 0 != $this->mNamespace ) {
1193                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1194                 }
1195                 return $p . $name;
1196         }
1197
1198         /**
1199          * Secure and split - main initialisation function for this object
1200          *
1201          * Assumes that mDbkeyform has been set, and is urldecoded
1202          * and uses underscores, but not otherwise munged.  This function
1203          * removes illegal characters, splits off the interwiki and
1204          * namespace prefixes, sets the other forms, and canonicalizes
1205          * everything.
1206          * @return bool true on success
1207          * @access private
1208          */
1209         /* private */ function secureAndSplit() {
1210                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1211                 $fname = 'Title::secureAndSplit';
1212                 wfProfileIn( $fname );
1213
1214                 # Initialisation
1215                 static $rxTc = false;
1216                 if( !$rxTc ) {
1217                         # % is needed as well
1218                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1219                 }
1220
1221                 $this->mInterwiki = $this->mFragment = '';
1222                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1223
1224                 # Clean up whitespace
1225                 #
1226                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1227                 $t = trim( $t, '_' );
1228
1229                 if ( '' == $t ) {
1230                         wfProfileOut( $fname );
1231                         return false;
1232                 }
1233
1234                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1235                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1236                         wfProfileOut( $fname );
1237                         return false;
1238                 }
1239
1240                 $this->mDbkeyform = $t;
1241
1242                 # Initial colon indicates main namespace rather than specified default
1243                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1244                 if ( ':' == $t{0} ) {
1245                         $this->mNamespace = NS_MAIN;
1246                         $t = substr( $t, 1 ); # remove the colon but continue processing
1247                 }
1248
1249                 # Namespace or interwiki prefix
1250                 $firstPass = true;
1251                 do {
1252                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1253                                 $p = $m[1];
1254                                 $lowerNs = strtolower( $p );
1255                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1256                                         # Canonical namespace
1257                                         $t = $m[2];
1258                                         $this->mNamespace = $ns;
1259                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1260                                         # Ordinary namespace
1261                                         $t = $m[2];
1262                                         $this->mNamespace = $ns;
1263                                 } elseif( $this->getInterwikiLink( $p ) ) {
1264                                         if( !$firstPass ) {
1265                                                 # Can't make a local interwiki link to an interwiki link.
1266                                                 # That's just crazy!
1267                                                 wfProfileOut( $fname );
1268                                                 return false;
1269                                         }
1270
1271                                         # Interwiki link
1272                                         $t = $m[2];
1273                                         $this->mInterwiki = strtolower( $p );
1274
1275                                         # Redundant interwiki prefix to the local wiki
1276                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1277                                                 if( $t == '' ) {
1278                                                         # Can't have an empty self-link
1279                                                         wfProfileOut( $fname );
1280                                                         return false;
1281                                                 }
1282                                                 $this->mInterwiki = '';
1283                                                 $firstPass = false;
1284                                                 # Do another namespace split...
1285                                                 continue;
1286                                         }
1287                                 }
1288                                 # If there's no recognized interwiki or namespace,
1289                                 # then let the colon expression be part of the title.
1290                         }
1291                         break;
1292                 } while( true );
1293                 $r = $t;
1294
1295                 # We already know that some pages won't be in the database!
1296                 #
1297                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1298                         $this->mArticleID = 0;
1299                 }
1300                 $f = strstr( $r, '#' );
1301                 if ( false !== $f ) {
1302                         $this->mFragment = substr( $f, 1 );
1303                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1304                         # remove whitespace again: prevents "Foo_bar_#"
1305                         # becoming "Foo_bar_"
1306                         $r = preg_replace( '/_*$/', '', $r );
1307                 }
1308
1309                 # Reject illegal characters.
1310                 #
1311                 if( preg_match( $rxTc, $r ) ) {
1312                         wfProfileOut( $fname );
1313                         return false;
1314                 }
1315
1316                 /**
1317                  * Pages with "/./" or "/../" appearing in the URLs will
1318                  * often be unreachable due to the way web browsers deal
1319                  * with 'relative' URLs. Forbid them explicitly.
1320                  */
1321                 if ( strpos( $r, '.' ) !== false &&
1322                      ( $r === '.' || $r === '..' ||
1323                        strpos( $r, './' ) === 0  ||
1324                        strpos( $r, '../' ) === 0 ||
1325                        strpos( $r, '/./' ) !== false ||
1326                        strpos( $r, '/../' ) !== false ) )
1327                 {
1328                         wfProfileOut( $fname );
1329                         return false;
1330                 }
1331
1332                 # We shouldn't need to query the DB for the size.
1333                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1334                 if ( strlen( $r ) > 255 ) {
1335                         wfProfileOut( $fname );
1336                         return false;
1337                 }
1338
1339                 /**
1340                  * Normally, all wiki links are forced to have
1341                  * an initial capital letter so [[foo]] and [[Foo]]
1342                  * point to the same place.
1343                  *
1344                  * Don't force it for interwikis, since the other
1345                  * site might be case-sensitive.
1346                  */
1347                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1348                         $t = $wgContLang->ucfirst( $r );
1349                 } else {
1350                         $t = $r;
1351                 }
1352
1353                 /**
1354                  * Can't make a link to a namespace alone...
1355                  * "empty" local links can only be self-links
1356                  * with a fragment identifier.
1357                  */
1358                 if( $t == '' &&
1359                         $this->mInterwiki == '' &&
1360                         $this->mNamespace != NS_MAIN ) {
1361                         wfProfileOut( $fname );
1362                         return false;
1363                 }
1364
1365                 # Fill fields
1366                 $this->mDbkeyform = $t;
1367                 $this->mUrlform = wfUrlencode( $t );
1368
1369                 $this->mTextform = str_replace( '_', ' ', $t );
1370
1371                 wfProfileOut( $fname );
1372                 return true;
1373         }
1374
1375         /**
1376          * Get a Title object associated with the talk page of this article
1377          * @return Title the object for the talk page
1378          * @access public
1379          */
1380         function getTalkPage() {
1381                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1382         }
1383
1384         /**
1385          * Get a title object associated with the subject page of this
1386          * talk page
1387          *
1388          * @return Title the object for the subject page
1389          * @access public
1390          */
1391         function getSubjectPage() {
1392                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1393         }
1394
1395         /**
1396          * Get an array of Title objects linking to this Title
1397          * Also stores the IDs in the link cache.
1398          *
1399          * @param string $options may be FOR UPDATE
1400          * @return array the Title objects linking here
1401          * @access public
1402          */
1403         function getLinksTo( $options = '' ) {
1404                 global $wgLinkCache;
1405                 $id = $this->getArticleID();
1406
1407                 if ( $options ) {
1408                         $db =& wfGetDB( DB_MASTER );
1409                 } else {
1410                         $db =& wfGetDB( DB_SLAVE );
1411                 }
1412
1413                 $res = $db->select( array( 'page', 'pagelinks' ),
1414                         array( 'page_namespace', 'page_title', 'page_id' ),
1415                         array(
1416                                 'pl_from=page_id',
1417                                 'pl_namespace' => $this->getNamespace(),
1418                                 'pl_title'     => $this->getDbKey() ),
1419                         'Title::getLinksTo',
1420                         $options );
1421
1422                 $retVal = array();
1423                 if ( $db->numRows( $res ) ) {
1424                         while ( $row = $db->fetchObject( $res ) ) {
1425                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1426                                         $wgLinkCache->addGoodLinkObj( $row->page_id, $titleObj );
1427                                         $retVal[] = $titleObj;
1428                                 }
1429                         }
1430                 }
1431                 $db->freeResult( $res );
1432                 return $retVal;
1433         }
1434
1435         /**
1436          * Get an array of Title objects referring to non-existent articles linked from this page
1437          *
1438          * @param string $options may be FOR UPDATE
1439          * @return array the Title objects
1440          * @access public
1441          */
1442         function getBrokenLinksFrom( $options = '' ) {
1443                 global $wgLinkCache;
1444
1445                 if ( $options ) {
1446                         $db =& wfGetDB( DB_MASTER );
1447                 } else {
1448                         $db =& wfGetDB( DB_SLAVE );
1449                 }
1450
1451                 $res = $db->safeQuery(
1452                           "SELECT pl_namespace, pl_title
1453                              FROM !
1454                         LEFT JOIN !
1455                                ON pl_namespace=page_namespace
1456                               AND pl_title=page_title
1457                             WHERE pl_from=?
1458                               AND page_namespace IS NULL
1459                                   !",
1460                         $db->tableName( 'pagelinks' ),
1461                         $db->tableName( 'page' ),
1462                         $this->getArticleId(),
1463                         $options );
1464
1465                 $retVal = array();
1466                 if ( $db->numRows( $res ) ) {
1467                         while ( $row = $db->fetchObject( $res ) ) {
1468                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1469                         }
1470                 }
1471                 $db->freeResult( $res );
1472                 return $retVal;
1473         }
1474
1475
1476         /**
1477          * Get a list of URLs to purge from the Squid cache when this
1478          * page changes
1479          *
1480          * @return array the URLs
1481          * @access public
1482          */
1483         function getSquidURLs() {
1484                 return array(
1485                         $this->getInternalURL(),
1486                         $this->getInternalURL( 'action=history' )
1487                 );
1488         }
1489
1490         /**
1491          * Move this page without authentication
1492          * @param Title &$nt the new page Title
1493          * @access public
1494          */
1495         function moveNoAuth( &$nt ) {
1496                 return $this->moveTo( $nt, false );
1497         }
1498
1499         /**
1500          * Check whether a given move operation would be valid.
1501          * Returns true if ok, or a message key string for an error message
1502          * if invalid. (Scarrrrry ugly interface this.)
1503          * @param Title &$nt the new title
1504          * @param bool $auth indicates whether $wgUser's permissions
1505          *      should be checked
1506          * @return mixed true on success, message name on failure
1507          * @access public
1508          */
1509         function isValidMoveOperation( &$nt, $auth = true ) {
1510                 global $wgUser;
1511                 if( !$this or !$nt ) {
1512                         return 'badtitletext';
1513                 }
1514                 if( $this->equals( $nt ) ) {
1515                         return 'selfmove';
1516                 }
1517                 if( !$this->isMovable() || !$nt->isMovable() ) {
1518                         return 'immobile_namespace';
1519                 }
1520
1521                 $oldid = $this->getArticleID();
1522                 $newid = $nt->getArticleID();
1523
1524                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1525                         return 'articleexists';
1526                 }
1527                 if ( ( '' == $this->getDBkey() ) ||
1528                          ( !$oldid ) ||
1529                      ( '' == $nt->getDBkey() ) ) {
1530                         return 'badarticleerror';
1531                 }
1532
1533                 if ( $auth && (
1534                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1535                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1536                         return 'protectedpage';
1537                 }
1538
1539                 # The move is allowed only if (1) the target doesn't exist, or
1540                 # (2) the target is a redirect to the source, and has no history
1541                 # (so we can undo bad moves right after they're done).
1542
1543                 if ( 0 != $newid ) { # Target exists; check for validity
1544                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1545                                 return 'articleexists';
1546                         }
1547                 }
1548                 return true;
1549         }
1550
1551         /**
1552          * Move a title to a new location
1553          * @param Title &$nt the new title
1554          * @param bool $auth indicates whether $wgUser's permissions
1555          *      should be checked
1556          * @return mixed true on success, message name on failure
1557          * @access public
1558          */
1559         function moveTo( &$nt, $auth = true, $reason = '' ) {
1560                 $err = $this->isValidMoveOperation( $nt, $auth );
1561                 if( is_string( $err ) ) {
1562                         return $err;
1563                 }
1564
1565                 $pageid = $this->getArticleID();
1566                 if( $nt->exists() ) {
1567                         $this->moveOverExistingRedirect( $nt, $reason );
1568                         $pageCountChange = 0;
1569                 } else { # Target didn't exist, do normal move.
1570                         $this->moveToNewTitle( $nt, $newid, $reason );
1571                         $pageCountChange = 1;
1572                 }
1573                 $redirid = $this->getArticleID();
1574
1575                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1576                 $dbw =& wfGetDB( DB_MASTER );
1577                 $categorylinks = $dbw->tableName( 'categorylinks' );
1578                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1579                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1580                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1581                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1582
1583                 # Update watchlists
1584
1585                 $oldnamespace = $this->getNamespace() & ~1;
1586                 $newnamespace = $nt->getNamespace() & ~1;
1587                 $oldtitle = $this->getDBkey();
1588                 $newtitle = $nt->getDBkey();
1589
1590                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1591                         WatchedItem::duplicateEntries( $this, $nt );
1592                 }
1593
1594                 # Update search engine
1595                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1596                 $u->doUpdate();
1597                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1598                 $u->doUpdate();
1599
1600                 # Update site_stats
1601                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1602                         # Moved out of main namespace
1603                         # not viewed, edited, removing
1604                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1605                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1606                         # Moved into main namespace
1607                         # not viewed, edited, adding
1608                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1609                 } elseif ( $pageCountChange ) {
1610                         # Added redirect
1611                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1612                 } else{
1613                         $u = false;
1614                 }
1615                 if ( $u ) {
1616                         $u->doUpdate();
1617                 }
1618
1619                 global $wgUser;
1620                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1621                 return true;
1622         }
1623
1624         /**
1625          * Move page to a title which is at present a redirect to the
1626          * source page
1627          *
1628          * @param Title &$nt the page to move to, which should currently
1629          *      be a redirect
1630          * @access private
1631          */
1632         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1633                 global $wgUser, $wgLinkCache, $wgUseSquid, $wgMwRedir;
1634                 $fname = 'Title::moveOverExistingRedirect';
1635                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1636
1637                 if ( $reason ) {
1638                         $comment .= ": $reason";
1639                 }
1640
1641                 $now = wfTimestampNow();
1642                 $rand = wfRandom();
1643                 $newid = $nt->getArticleID();
1644                 $oldid = $this->getArticleID();
1645                 $dbw =& wfGetDB( DB_MASTER );
1646
1647                 # Delete the old redirect. We don't save it to history since
1648                 # by definition if we've got here it's rather uninteresting.
1649                 # We have to remove it so that the next step doesn't trigger
1650                 # a conflict on the unique namespace+title index...
1651                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1652
1653                 # Save a null revision in the page's history notifying of the move
1654                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1655                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1656                         true );
1657                 $nullRevId = $nullRevision->insertOn( $dbw );
1658
1659                 # Change the name of the target page:
1660                 $dbw->update( 'page',
1661                         /* SET */ array(
1662                                 'page_touched'   => $dbw->timestamp($now),
1663                                 'page_namespace' => $nt->getNamespace(),
1664                                 'page_title'     => $nt->getDBkey(),
1665                                 'page_latest'    => $nullRevId,
1666                         ),
1667                         /* WHERE */ array( 'page_id' => $oldid ),
1668                         $fname
1669                 );
1670                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1671
1672                 # Recreate the redirect, this time in the other direction.
1673                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1674                 $redirectArticle = new Article( $this );
1675                 $newid = $redirectArticle->insertOn( $dbw );
1676                 $redirectRevision = new Revision( array(
1677                         'page'    => $newid,
1678                         'comment' => $comment,
1679                         'text'    => $redirectText ) );
1680                 $revid = $redirectRevision->insertOn( $dbw );
1681                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1682                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1683
1684                 # Log the move
1685                 $log = new LogPage( 'move' );
1686                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1687
1688                 # Now, we record the link from the redirect to the new title.
1689                 # It should have no other outgoing links...
1690                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1691                 $dbw->insert( 'pagelinks',
1692                         array(
1693                                 'pl_from'      => $newid,
1694                                 'pl_namespace' => $nt->getNamespace(),
1695                                 'pl_title'     => $nt->getDbKey() ),
1696                         $fname );
1697
1698                 # Purge squid
1699                 if ( $wgUseSquid ) {
1700                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1701                         $u = new SquidUpdate( $urls );
1702                         $u->doUpdate();
1703                 }
1704         }
1705
1706         /**
1707          * Move page to non-existing title.
1708          * @param Title &$nt the new Title
1709          * @param int &$newid set to be the new article ID
1710          * @access private
1711          */
1712         function moveToNewTitle( &$nt, &$newid, $reason = '' ) {
1713                 global $wgUser, $wgLinkCache, $wgUseSquid;
1714                 global $wgMwRedir;
1715                 $fname = 'MovePageForm::moveToNewTitle';
1716                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1717                 if ( $reason ) {
1718                         $comment .= ": $reason";
1719                 }
1720
1721                 $newid = $nt->getArticleID();
1722                 $oldid = $this->getArticleID();
1723                 $dbw =& wfGetDB( DB_MASTER );
1724                 $now = $dbw->timestamp();
1725                 wfSeedRandom();
1726                 $rand = wfRandom();
1727
1728                 # Save a null revision in the page's history notifying of the move
1729                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1730                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1731                         true );
1732                 $nullRevId = $nullRevision->insertOn( $dbw );
1733
1734                 # Rename cur entry
1735                 $dbw->update( 'page',
1736                         /* SET */ array(
1737                                 'page_touched'   => $now,
1738                                 'page_namespace' => $nt->getNamespace(),
1739                                 'page_title'     => $nt->getDBkey(),
1740                                 'page_latest'    => $nullRevId,
1741                         ),
1742                         /* WHERE */ array( 'page_id' => $oldid ),
1743                         $fname
1744                 );
1745
1746                 $wgLinkCache->clearLink( $nt->getPrefixedDBkey() );
1747
1748                 # Insert redirect
1749                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1750                 $redirectArticle = new Article( $this );
1751                 $newid = $redirectArticle->insertOn( $dbw );
1752                 $redirectRevision = new Revision( array(
1753                         'page'    => $newid,
1754                         'comment' => $comment,
1755                         'text'    => $redirectText ) );
1756                 $revid = $redirectRevision->insertOn( $dbw );
1757                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1758                 $wgLinkCache->clearLink( $this->getPrefixedDBkey() );
1759
1760                 # Log the move
1761                 $log = new LogPage( 'move' );
1762                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1763
1764                 # Purge caches as per article creation
1765                 Article::onArticleCreate( $nt );
1766
1767                 # Record the just-created redirect's linking to the page
1768                 $dbw->insert( 'pagelinks',
1769                         array(
1770                                 'pl_from'      => $newid,
1771                                 'pl_namespace' => $nt->getNamespace(),
1772                                 'pl_title'     => $nt->getDBkey() ),
1773                         $fname );
1774
1775                 # Non-existent target may have had broken links to it; these must
1776                 # now be touched to update link coloring.
1777                 $nt->touchLinks();
1778
1779                 # Purge old title from squid
1780                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1781                 $titles = $nt->getLinksTo();
1782                 if ( $wgUseSquid ) {
1783                         $urls = $this->getSquidURLs();
1784                         foreach ( $titles as $linkTitle ) {
1785                                 $urls[] = $linkTitle->getInternalURL();
1786                         }
1787                         $u = new SquidUpdate( $urls );
1788                         $u->doUpdate();
1789                 }
1790         }
1791
1792         /**
1793          * Checks if $this can be moved to a given Title
1794          * - Selects for update, so don't call it unless you mean business
1795          *
1796          * @param Title &$nt the new title to check
1797          * @access public
1798          */
1799         function isValidMoveTarget( $nt ) {
1800
1801                 $fname = 'Title::isValidMoveTarget';
1802                 $dbw =& wfGetDB( DB_MASTER );
1803
1804                 # Is it a redirect?
1805                 $id  = $nt->getArticleID();
1806                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1807                         array( 'page_is_redirect','old_text','old_flags' ),
1808                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1809                         $fname, 'FOR UPDATE' );
1810
1811                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1812                         # Not a redirect
1813                         return false;
1814                 }
1815                 $text = Revision::getRevisionText( $obj );
1816
1817                 # Does the redirect point to the source?
1818                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
1819                         $redirTitle = Title::newFromText( $m[1] );
1820                         if( !is_object( $redirTitle ) ||
1821                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1822                                 return false;
1823                         }
1824                 } else {
1825                         # Fail safe
1826                         return false;
1827                 }
1828
1829                 # Does the article have a history?
1830                 $row = $dbw->selectRow( array( 'page', 'revision'),
1831                         array( 'rev_id' ),
1832                         array( 'page_namespace' => $nt->getNamespace(),
1833                                 'page_title' => $nt->getDBkey(),
1834                                 'page_id=rev_page AND page_latest != rev_id'
1835                         ), $fname, 'FOR UPDATE'
1836                 );
1837
1838                 # Return true if there was no history
1839                 return $row === false;
1840         }
1841
1842         /**
1843          * Create a redirect; fails if the title already exists; does
1844          * not notify RC
1845          *
1846          * @param Title $dest the destination of the redirect
1847          * @param string $comment the comment string describing the move
1848          * @return bool true on success
1849          * @access public
1850          */
1851         function createRedirect( $dest, $comment ) {
1852                 global $wgUser;
1853                 if ( $this->getArticleID() ) {
1854                         return false;
1855                 }
1856
1857                 $fname = 'Title::createRedirect';
1858                 $dbw =& wfGetDB( DB_MASTER );
1859
1860                 $article = new Article( $this );
1861                 $newid = $article->insertOn( $dbw );
1862                 $revision = new Revision( array(
1863                         'page'      => $newid,
1864                         'comment'   => $comment,
1865                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1866                         ) );
1867                 $revisionId = $revision->insertOn( $dbw );
1868                 $article->updateRevisionOn( $dbw, $revision, 0 );
1869
1870                 # Link table
1871                 $dbw->insert( 'pagelinks',
1872                         array(
1873                                 'pl_from'      => $newid,
1874                                 'pl_namespace' => $dest->getNamespace(),
1875                                 'pl_title'     => $dest->getDbKey()
1876                         ), $fname
1877                 );
1878
1879                 Article::onArticleCreate( $this );
1880                 return true;
1881         }
1882
1883         /**
1884          * Get categories to which this Title belongs and return an array of
1885          * categories' names.
1886          *
1887          * @return array an array of parents in the form:
1888          *      $parent => $currentarticle
1889          * @access public
1890          */
1891         function getParentCategories() {
1892                 global $wgContLang,$wgUser;
1893
1894                 $titlekey = $this->getArticleId();
1895                 $dbr =& wfGetDB( DB_SLAVE );
1896                 $categorylinks = $dbr->tableName( 'categorylinks' );
1897
1898                 # NEW SQL
1899                 $sql = "SELECT * FROM $categorylinks"
1900                      ." WHERE cl_from='$titlekey'"
1901                          ." AND cl_from <> '0'"
1902                          ." ORDER BY cl_sortkey";
1903
1904                 $res = $dbr->query ( $sql ) ;
1905
1906                 if($dbr->numRows($res) > 0) {
1907                         while ( $x = $dbr->fetchObject ( $res ) )
1908                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1909                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1910                         $dbr->freeResult ( $res ) ;
1911                 } else {
1912                         $data = '';
1913                 }
1914                 return $data;
1915         }
1916
1917         /**
1918          * Get a tree of parent categories
1919          * @param array $children an array with the children in the keys, to check for circular refs
1920          * @return array
1921          * @access public
1922          */
1923         function getParentCategoryTree( $children = array() ) {
1924                 $parents = $this->getParentCategories();
1925
1926                 if($parents != '') {
1927                         foreach($parents as $parent => $current) {
1928                                 if ( array_key_exists( $parent, $children ) ) {
1929                                         # Circular reference
1930                                         $stack[$parent] = array();
1931                                 } else {
1932                                         $nt = Title::newFromText($parent);
1933                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1934                                 }
1935                         }
1936                         return $stack;
1937                 } else {
1938                         return array();
1939                 }
1940         }
1941
1942
1943         /**
1944          * Get an associative array for selecting this title from
1945          * the "cur" table
1946          *
1947          * @return array
1948          * @access public
1949          */
1950         function curCond() {
1951                 wfDebugDieBacktrace( 'curCond called' );
1952                 return array( 'cur_namespace' => $this->mNamespace, 'cur_title' => $this->mDbkeyform );
1953         }
1954
1955         /**
1956          * Get an associative array for selecting this title from the
1957          * "old" table
1958          *
1959          * @return array
1960          * @access public
1961          */
1962         function oldCond() {
1963                 wfDebugDieBacktrace( 'oldCond called' );
1964                 return array( 'old_namespace' => $this->mNamespace, 'old_title' => $this->mDbkeyform );
1965         }
1966
1967         /**
1968          * Get the revision ID of the previous revision
1969          *
1970          * @param integer $revision  Revision ID. Get the revision that was before this one.
1971          * @return interger $oldrevision|false
1972          */
1973         function getPreviousRevisionID( $revision ) {
1974                 $dbr =& wfGetDB( DB_SLAVE );
1975                 return $dbr->selectField( 'revision', 'rev_id',
1976                         'rev_page=' . intval( $this->getArticleId() ) .
1977                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
1978         }
1979
1980         /**
1981          * Get the revision ID of the next revision
1982          *
1983          * @param integer $revision  Revision ID. Get the revision that was after this one.
1984          * @return interger $oldrevision|false
1985          */
1986         function getNextRevisionID( $revision ) {
1987                 $dbr =& wfGetDB( DB_SLAVE );
1988                 return $dbr->selectField( 'revision', 'rev_id',
1989                         'rev_page=' . intval( $this->getArticleId() ) .
1990                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
1991         }
1992
1993         /**
1994          * Compare with another title.
1995          *
1996          * @param Title $title
1997          * @return bool
1998          */
1999         function equals( $title ) {
2000                 return $this->getInterwiki() == $title->getInterwiki()
2001                         && $this->getNamespace() == $title->getNamespace()
2002                         && $this->getDbkey() == $title->getDbkey();
2003         }
2004
2005         /**
2006          * Check if page exists
2007          * @return bool
2008          */
2009         function exists() {
2010                 return $this->getArticleId() != 0;
2011         }
2012
2013         /**
2014          * Should a link should be displayed as a known link, just based on its title?
2015          *
2016          * Currently, a self-link with a fragment and special pages are in
2017          * this category. Special pages never exist in the database.
2018          */
2019         function isAlwaysKnown() {
2020                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2021                   || NS_SPECIAL == $this->mNamespace;
2022         }
2023
2024         /**
2025          * Update page_touched timestamps on pages linking to this title.
2026          * In principal, this could be backgrounded and could also do squid
2027          * purging.
2028          */
2029         function touchLinks() {
2030                 $fname = 'Title::touchLinks';
2031
2032                 $dbw =& wfGetDB( DB_MASTER );
2033
2034                 $res = $dbw->select( 'pagelinks',
2035                         array( 'pl_from' ),
2036                         array(
2037                                 'pl_namespace' => $this->getNamespace(),
2038                                 'pl_title'     => $this->getDbKey() ),
2039                         $fname );
2040
2041                 $toucharr = array();
2042                 while( $row = $dbw->fetchObject( $res ) ) {
2043                         $toucharr[] = $row->pl_from;
2044                 }
2045                 $dbw->freeResult( $res );
2046
2047                 if( $this->getNamespace() == NS_CATEGORY ) {
2048                         // Categories show up in a separate set of links as well
2049                         $res = $dbw->select( 'categorylinks',
2050                                 array( 'cl_from' ),
2051                                 array( 'cl_to' => $this->getDbKey() ),
2052                                 $fname );
2053                         while( $row = $dbw->fetchObject( $res ) ) {
2054                                 $toucharr[] = $row->cl_from;
2055                         }
2056                         $dbw->freeResult( $res );
2057                 }
2058
2059                 if (!count($toucharr))
2060                         return;
2061                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2062                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2063         }
2064
2065         function trackbackURL() {
2066                 global $wgTitle, $wgScriptPath, $wgServer;
2067
2068                 return "$wgServer$wgScriptPath/trackback.php?article="
2069                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2070         }
2071
2072         function trackbackRDF() {
2073                 $url = htmlspecialchars($this->getFullURL());
2074                 $title = htmlspecialchars($this->getText());
2075                 $tburl = $this->trackbackURL();
2076
2077                 return "
2078 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2079          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2080          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2081 <rdf:Description
2082    rdf:about=\"$url\"
2083    dc:identifier=\"$url\"
2084    dc:title=\"$title\"
2085    trackback:ping=\"$tburl\" />
2086 </rdf:RDF>";
2087         }
2088 }
2089 ?>