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                 static $cachedcount = 0 ;
 139                 if( $t->secureAndSplit() ) {
 140                         if( $defaultNamespace == NS_MAIN ) {
 141                                 if( $cachedcount >= MW_TITLECACHE_MAX ) {
 142                                         # Avoid memory leaks on mass operations...
 143                                         $wgTitleCache = array();
 144                                         $cachedcount=0;
 145                                 }
 146                                 $cachedcount++;
 147                                 $wgTitleCache[$text] =& $t;
 148                         }
 149                         wfProfileOut( $fname );
 150                         return $t;
 151                 } else {
 152                         wfProfileOut( $fname );
 153                         $ret = NULL;
 154                         return $ret;
 155                 }
 156         }
 157
 158         /**
 159          * Create a new Title from URL-encoded text. Ensures that
 160          * the given title's length does not exceed the maximum.
 161          * @param string $url the title, as might be taken from a URL
 162          * @return Title the new object, or NULL on an error
 163          * @static
 164          * @access public
 165          */
 166         function newFromURL( $url ) {
 167                 global $wgLegalTitleChars;
 168                 $t = new Title();
 169
 170                 # For compatibility with old buggy URLs. "+" is usually not valid in titles,
 171                 # but some URLs used it as a space replacement and they still come
 172                 # from some external search tools.
 173                 if ( strpos( $wgLegalTitleChars, '+' ) === false ) {
 174                         $url = str_replace( '+', ' ', $url );
 175                 }
 176
 177                 $t->mDbkeyform = str_replace( ' ', '_', $url );
 178                 if( $t->secureAndSplit() ) {
 179                         return $t;
 180                 } else {
 181                         return NULL;
 182                 }
 183         }
 184
 185         /**
 186          * Create a new Title from an article ID
 187          *
 188          * @todo This is inefficiently implemented, the page row is requested
 189          *       but not used for anything else
 190          *
 191          * @param int $id the page_id corresponding to the Title to create
 192          * @return Title the new object, or NULL on an error
 193          * @access public
 194          * @static
 195          */
 196         function newFromID( $id ) {
 197                 $fname = 'Title::newFromID';
 198                 $dbr =& wfGetDB( DB_SLAVE );
 199                 $row = $dbr->selectRow( 'page', array( 'page_namespace', 'page_title' ),
 200                         array( 'page_id' => $id ), $fname );
 201                 if ( $row !== false ) {
 202                         $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 203                 } else {
 204                         $title = NULL;
 205                 }
 206                 return $title;
 207         }
 208
 209         /**
 210          * Create a new Title from a namespace index and a DB key.
 211          * It's assumed that $ns and $title are *valid*, for instance when
 212          * they came directly from the database or a special page name.
 213          * For convenience, spaces are converted to underscores so that
 214          * eg user_text fields can be used directly.
 215          *
 216          * @param int $ns the namespace of the article
 217          * @param string $title the unprefixed database key form
 218          * @return Title the new object
 219          * @static
 220          * @access public
 221          */
 222         function &makeTitle( $ns, $title ) {
 223                 $t =& new Title();
 224                 $t->mInterwiki = '';
 225                 $t->mFragment = '';
 226                 $t->mNamespace = intval( $ns );
 227                 $t->mDbkeyform = str_replace( ' ', '_', $title );
 228                 $t->mArticleID = ( $ns >= 0 ) ? -1 : 0;
 229                 $t->mUrlform = wfUrlencode( $t->mDbkeyform );
 230                 $t->mTextform = str_replace( '_', ' ', $title );
 231                 return $t;
 232         }
 233
 234         /**
 235          * Create a new Title frrom a namespace index and a DB key.
 236          * The parameters will be checked for validity, which is a bit slower
 237          * than makeTitle() but safer for user-provided data.
 238          *
 239          * @param int $ns the namespace of the article
 240          * @param string $title the database key form
 241          * @return Title the new object, or NULL on an error
 242          * @static
 243          * @access public
 244          */
 245         function makeTitleSafe( $ns, $title ) {
 246                 $t = new Title();
 247                 $t->mDbkeyform = Title::makeName( $ns, $title );
 248                 if( $t->secureAndSplit() ) {
 249                         return $t;
 250                 } else {
 251                         return NULL;
 252                 }
 253         }
 254
 255         /**
 256          * Create a new Title for the Main Page
 257          *
 258          * @static
 259          * @return Title the new object
 260          * @access public
 261          */
 262         function newMainPage() {
 263                 return Title::newFromText( wfMsgForContent( 'mainpage' ) );
 264         }
 265
 266         /**
 267          * Create a new Title for a redirect
 268          * @param string $text the redirect title text
 269          * @return Title the new object, or NULL if the text is not a
 270          *      valid redirect
 271          * @static
 272          * @access public
 273          */
 274         function newFromRedirect( $text ) {
 275                 global $wgMwRedir;
 276                 $rt = NULL;
 277                 if ( $wgMwRedir->matchStart( $text ) ) {
 278                         if ( preg_match( '/\[{2}(.*?)(?:\||\]{2})/', $text, $m ) ) {
 279                                 # categories are escaped using : for example one can enter:
 280                                 # #REDIRECT [[:Category:Music]]. Need to remove it.
 281                                 if ( substr($m[1],0,1) == ':') {
 282                                         # We don't want to keep the ':'
 283                                         $m[1] = substr( $m[1], 1 );
 284                                 }
 285
 286                                 $rt = Title::newFromText( $m[1] );
 287                                 # Disallow redirects to Special:Userlogout
 288                                 if ( !is_null($rt) && $rt->getNamespace() == NS_SPECIAL && preg_match( '/^Userlogout/i', $rt->getText() ) ) {
 289                                         $rt = NULL;
 290                                 }
 291                         }
 292                 }
 293                 return $rt;
 294         }
 295
 296 #----------------------------------------------------------------------------
 297 #       Static functions
 298 #----------------------------------------------------------------------------
 299
 300         /**
 301          * Get the prefixed DB key associated with an ID
 302          * @param int $id the page_id of the article
 303          * @return Title an object representing the article, or NULL
 304          *      if no such article was found
 305          * @static
 306          * @access public
 307          */
 308         function nameOf( $id ) {
 309                 $fname = 'Title::nameOf';
 310                 $dbr =& wfGetDB( DB_SLAVE );
 311
 312                 $s = $dbr->selectRow( 'page', array( 'page_namespace','page_title' ),  array( 'page_id' => $id ), $fname );
 313                 if ( $s === false ) { return NULL; }
 314
 315                 $n = Title::makeName( $s->page_namespace, $s->page_title );
 316                 return $n;
 317         }
 318
 319         /**
 320          * Get a regex character class describing the legal characters in a link
 321          * @return string the list of characters, not delimited
 322          * @static
 323          * @access public
 324          */
 325         function legalChars() {
 326                 global $wgLegalTitleChars;
 327                 return $wgLegalTitleChars;
 328         }
 329
 330         /**
 331          * Get a string representation of a title suitable for
 332          * including in a search index
 333          *
 334          * @param int $ns a namespace index
 335          * @param string $title text-form main part
 336          * @return string a stripped-down title string ready for the
 337          *      search index
 338          */
 339         /* static */ function indexTitle( $ns, $title ) {
 340                 global $wgContLang;
 341                 require_once( 'SearchEngine.php' );
 342
 343                 $lc = SearchEngine::legalSearchChars() . '&#;';
 344                 $t = $wgContLang->stripForSearch( $title );
 345                 $t = preg_replace( "/[^{$lc}]+/", ' ', $t );
 346                 $t = strtolower( $t );
 347
 348                 # Handle 's, s'
 349                 $t = preg_replace( "/([{$lc}]+)'s( |$)/", "\\1 \\1's ", $t );
 350                 $t = preg_replace( "/([{$lc}]+)s'( |$)/", "\\1s ", $t );
 351
 352                 $t = preg_replace( "/\\s+/", ' ', $t );
 353
 354                 if ( $ns == NS_IMAGE ) {
 355                         $t = preg_replace( "/ (png|gif|jpg|jpeg|ogg)$/", "", $t );
 356                 }
 357                 return trim( $t );
 358         }
 359
 360         /*
 361          * Make a prefixed DB key from a DB key and a namespace index
 362          * @param int $ns numerical representation of the namespace
 363          * @param string $title the DB key form the title
 364          * @return string the prefixed form of the title
 365          */
 366         /* static */ function makeName( $ns, $title ) {
 367                 global $wgContLang;
 368
 369                 $n = $wgContLang->getNsText( $ns );
 370                 return $n == '' ? $title : "$n:$title";
 371         }
 372
 373         /**
 374          * Returns the URL associated with an interwiki prefix
 375          * @param string $key the interwiki prefix (e.g. "MeatBall")
 376          * @return the associated URL, containing "$1", which should be
 377          *      replaced by an article title
 378          * @static (arguably)
 379          * @access public
 380          */
 381         function getInterwikiLink( $key )  {
 382                 global $wgMemc, $wgDBname, $wgInterwikiExpiry, $wgTitleInterwikiCache;
 383                 $fname = 'Title::getInterwikiLink';
 384
 385                 wfProfileIn( $fname );
 386
 387                 $key = strtolower( $key );
 388
 389                 $k = $wgDBname.':interwiki:'.$key;
 390                 if( array_key_exists( $k, $wgTitleInterwikiCache ) ) {
 391                         wfProfileOut( $fname );
 392                         return $wgTitleInterwikiCache[$k]->iw_url;
 393                 }
 394
 395                 $s = $wgMemc->get( $k );
 396                 # Ignore old keys with no iw_local
 397                 if( $s && isset( $s->iw_local ) && isset($s->iw_trans)) {
 398                         $wgTitleInterwikiCache[$k] = $s;
 399                         wfProfileOut( $fname );
 400                         return $s->iw_url;
 401                 }
 402
 403                 $dbr =& wfGetDB( DB_SLAVE );
 404                 $res = $dbr->select( 'interwiki',
 405                         array( 'iw_url', 'iw_local', 'iw_trans' ),
 406                         array( 'iw_prefix' => $key ), $fname );
 407                 if( !$res ) {
 408                         wfProfileOut( $fname );
 409                         return '';
 410                 }
 411
 412                 $s = $dbr->fetchObject( $res );
 413                 if( !$s ) {
 414                         # Cache non-existence: create a blank object and save it to memcached
 415                         $s = (object)false;
 416                         $s->iw_url = '';
 417                         $s->iw_local = 0;
 418                         $s->iw_trans = 0;
 419                 }
 420                 $wgMemc->set( $k, $s, $wgInterwikiExpiry );
 421                 $wgTitleInterwikiCache[$k] = $s;
 422
 423                 wfProfileOut( $fname );
 424                 return $s->iw_url;
 425         }
 426
 427         /**
 428          * Determine whether the object refers to a page within
 429          * this project.
 430          *
 431          * @return bool TRUE if this is an in-project interwiki link
 432          *      or a wikilink, FALSE otherwise
 433          * @access public
 434          */
 435         function isLocal() {
 436                 global $wgTitleInterwikiCache, $wgDBname;
 437
 438                 if ( $this->mInterwiki != '' ) {
 439                         # Make sure key is loaded into cache
 440                         $this->getInterwikiLink( $this->mInterwiki );
 441                         $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 442                         return (bool)($wgTitleInterwikiCache[$k]->iw_local);
 443                 } else {
 444                         return true;
 445                 }
 446         }
 447
 448         /**
 449          * Determine whether the object refers to a page within
 450          * this project and is transcludable.
 451          *
 452          * @return bool TRUE if this is transcludable
 453          * @access public
 454          */
 455         function isTrans() {
 456                 global $wgTitleInterwikiCache, $wgDBname;
 457
 458                 if ($this->mInterwiki == '' || !$this->isLocal())
 459                         return false;
 460                 # Make sure key is loaded into cache
 461                 $this->getInterwikiLink( $this->mInterwiki );
 462                 $k = $wgDBname.':interwiki:' . $this->mInterwiki;
 463                 return (bool)($wgTitleInterwikiCache[$k]->iw_trans);
 464         }
 465
 466         /**
 467          * Update the page_touched field for an array of title objects
 468          * @todo Inefficient unless the IDs are already loaded into the
 469          *      link cache
 470          * @param array $titles an array of Title objects to be touched
 471          * @param string $timestamp the timestamp to use instead of the
 472          *      default current time
 473          * @static
 474          * @access public
 475          */
 476         function touchArray( $titles, $timestamp = '' ) {
 477
 478                 if ( count( $titles ) == 0 ) {
 479                         return;
 480                 }
 481                 $dbw =& wfGetDB( DB_MASTER );
 482                 if ( $timestamp == '' ) {
 483                         $timestamp = $dbw->timestamp();
 484                 }
 485                 /*
 486                 $page = $dbw->tableName( 'page' );
 487                 $sql = "UPDATE $page SET page_touched='{$timestamp}' WHERE page_id IN (";
 488                 $first = true;
 489
 490                 foreach ( $titles as $title ) {
 491                         if ( $wgUseFileCache ) {
 492                                 $cm = new CacheManager($title);
 493                                 @unlink($cm->fileCacheName());
 494                         }
 495
 496                         if ( ! $first ) {
 497                                 $sql .= ',';
 498                         }
 499                         $first = false;
 500                         $sql .= $title->getArticleID();
 501                 }
 502                 $sql .= ')';
 503                 if ( ! $first ) {
 504                         $dbw->query( $sql, 'Title::touchArray' );
 505                 }
 506                 */
 507                 // hack hack hack -- brion 2005-07-11. this was unfriendly to db.
 508                 // do them in small chunks:
 509                 $fname = 'Title::touchArray';
 510                 foreach( $titles as $title ) {
 511                         $dbw->update( 'page',
 512                                 array( 'page_touched' => $timestamp ),
 513                                 array(
 514                                         'page_namespace' => $title->getNamespace(),
 515                                         'page_title'     => $title->getDBkey() ),
 516                                 $fname );
 517                 }
 518         }
 519
 520 #----------------------------------------------------------------------------
 521 #       Other stuff
 522 #----------------------------------------------------------------------------
 523
 524         /** Simple accessors */
 525         /**
 526          * Get the text form (spaces not underscores) of the main part
 527          * @return string
 528          * @access public
 529          */
 530         function getText() { return $this->mTextform; }
 531         /**
 532          * Get the URL-encoded form of the main part
 533          * @return string
 534          * @access public
 535          */
 536         function getPartialURL() { return $this->mUrlform; }
 537         /**
 538          * Get the main part with underscores
 539          * @return string
 540          * @access public
 541          */
 542         function getDBkey() { return $this->mDbkeyform; }
 543         /**
 544          * Get the namespace index, i.e. one of the NS_xxxx constants
 545          * @return int
 546          * @access public
 547          */
 548         function getNamespace() { return $this->mNamespace; }
 549         /**
 550          * Get the namespace text
 551          * @return string
 552          * @access public
 553          */
 554         function getNsText() {
 555                 global $wgContLang;
 556                 return $wgContLang->getNsText( $this->mNamespace );
 557         }
 558         /**
 559          * Get the namespace text of the subject (rather than talk) page
 560          * @return string
 561          * @access public
 562          */
 563         function getSubjectNsText() {
 564                 global $wgContLang;
 565                 return $wgContLang->getNsText( Namespace::getSubject( $this->mNamespace ) );
 566         }
 567
 568         /**
 569          * Get the interwiki prefix (or null string)
 570          * @return string
 571          * @access public
 572          */
 573         function getInterwiki() { return $this->mInterwiki; }
 574         /**
 575          * Get the Title fragment (i.e. the bit after the #)
 576          * @return string
 577          * @access public
 578          */
 579         function getFragment() { return $this->mFragment; }
 580         /**
 581          * Get the default namespace index, for when there is no namespace
 582          * @return int
 583          * @access public
 584          */
 585         function getDefaultNamespace() { return $this->mDefaultNamespace; }
 586
 587         /**
 588          * Get title for search index
 589          * @return string a stripped-down title string ready for the
 590          *      search index
 591          */
 592         function getIndexTitle() {
 593                 return Title::indexTitle( $this->mNamespace, $this->mTextform );
 594         }
 595
 596         /**
 597          * Get the prefixed database key form
 598          * @return string the prefixed title, with underscores and
 599          *      any interwiki and namespace prefixes
 600          * @access public
 601          */
 602         function getPrefixedDBkey() {
 603                 $s = $this->prefix( $this->mDbkeyform );
 604                 $s = str_replace( ' ', '_', $s );
 605                 return $s;
 606         }
 607
 608         /**
 609          * Get the prefixed title with spaces.
 610          * This is the form usually used for display
 611          * @return string the prefixed title, with spaces
 612          * @access public
 613          */
 614         function getPrefixedText() {
 615                 global $wgContLang;
 616                 if ( empty( $this->mPrefixedText ) ) { // FIXME: bad usage of empty() ?
 617                         $s = $this->prefix( $this->mTextform );
 618                         $s = str_replace( '_', ' ', $s );
 619                         $this->mPrefixedText = $s;
 620                 }
 621                 return $this->mPrefixedText;
 622         }
 623
 624         /**
 625          * Get the prefixed title with spaces, plus any fragment
 626          * (part beginning with '#')
 627          * @return string the prefixed title, with spaces and
 628          *      the fragment, including '#'
 629          * @access public
 630          */
 631         function getFullText() {
 632                 global $wgContLang;
 633                 $text = $this->getPrefixedText();
 634                 if( '' != $this->mFragment ) {
 635                         $text .= '#' . $this->mFragment;
 636                 }
 637                 return $text;
 638         }
 639
 640         /**
 641          * Get a URL-encoded title (not an actual URL) including interwiki
 642          * @return string the URL-encoded form
 643          * @access public
 644          */
 645         function getPrefixedURL() {
 646                 $s = $this->prefix( $this->mDbkeyform );
 647                 $s = str_replace( ' ', '_', $s );
 648
 649                 $s = wfUrlencode ( $s ) ;
 650
 651                 # Cleaning up URL to make it look nice -- is this safe?
 652                 $s = str_replace( '%28', '(', $s );
 653                 $s = str_replace( '%29', ')', $s );
 654
 655                 return $s;
 656         }
 657
 658         /**
 659          * Get a real URL referring to this title, with interwiki link and
 660          * fragment
 661          *
 662          * @param string $query an optional query string, not used
 663          *      for interwiki links
 664          * @return string the URL
 665          * @access public
 666          */
 667         function getFullURL( $query = '' ) {
 668                 global $wgContLang, $wgServer;
 669
 670                 if ( '' == $this->mInterwiki ) {
 671                         $url = $wgServer . $this->getLocalUrl( $query );
 672                 } else {
 673                         $baseUrl = $this->getInterwikiLink( $this->mInterwiki );
 674
 675                         $namespace = $wgContLang->getNsText( $this->mNamespace );
 676                         if ( '' != $namespace ) {
 677                                 # Can this actually happen? Interwikis shouldn't be parsed.
 678                                 $namespace .= ':';
 679                         }
 680                         $url = str_replace( '$1', $namespace . $this->mUrlform, $baseUrl );
 681                         if( $query != '' ) {
 682                                 if( false === strpos( $url, '?' ) ) {
 683                                         $url .= '?';
 684                                 } else {
 685                                         $url .= '&';
 686                                 }
 687                                 $url .= $query;
 688                         }
 689                         if ( '' != $this->mFragment ) {
 690                                 $url .= '#' . $this->mFragment;
 691                         }
 692                 }
 693                 wfRunHooks( 'GetFullURL', array( &$this, &$url, $query ) );
 694                 return $url;
 695         }
 696
 697         /**
 698          * Get a URL with no fragment or server name.  If this page is generated
 699          * with action=render, $wgServer is prepended.
 700          * @param string $query an optional query string; if not specified,
 701          *      $wgArticlePath will be used.
 702          * @return string the URL
 703          * @access public
 704          */
 705         function getLocalURL( $query = '' ) {
 706                 global $wgArticlePath, $wgScript, $wgServer, $wgRequest;
 707
 708                 if ( $this->isExternal() ) {
 709                         $url = $this->getFullURL();
 710                 } else {
 711                         $dbkey = wfUrlencode( $this->getPrefixedDBkey() );
 712                         if ( $query == '' ) {
 713                                 $url = str_replace( '$1', $dbkey, $wgArticlePath );
 714                         } else {
 715                                 global $wgActionPaths;
 716                                 $url = false;
 717                                 if( !empty( $wgActionPaths ) &&
 718                                         preg_match( '/^(.*&|)action=([^&]*)(&(.*)|)$/', $query, $matches ) )
 719                                 {
 720                                         $action = urldecode( $matches[2] );
 721                                         if( isset( $wgActionPaths[$action] ) ) {
 722                                                 $query = $matches[1];
 723                                                 if( isset( $matches[4] ) ) $query .= $matches[4];
 724                                                 $url = str_replace( '$1', $dbkey, $wgActionPaths[$action] );
 725                                                 if( $query != '' ) $url .= '?' . $query;
 726                                         }
 727                                 }
 728                                 if ( $url === false ) {
 729                                         if ( $query == '-' ) {
 730                                                 $query = '';
 731                                         }
 732                                         $url = "{$wgScript}?title={$dbkey}&{$query}";
 733                                 }
 734                         }
 735
 736                         if ($wgRequest->getText('action') == 'render') {
 737                                 $url = $wgServer . $url;
 738                         }
 739                 }
 740                 wfRunHooks( 'GetLocalURL', array( &$this, &$url, $query ) );
 741                 return $url;
 742         }
 743
 744         /**
 745          * Get an HTML-escaped version of the URL form, suitable for
 746          * using in a link, without a server name or fragment
 747          * @param string $query an optional query string
 748          * @return string the URL
 749          * @access public
 750          */
 751         function escapeLocalURL( $query = '' ) {
 752                 return htmlspecialchars( $this->getLocalURL( $query ) );
 753         }
 754
 755         /**
 756          * Get an HTML-escaped version of the URL form, suitable for
 757          * using in a link, including the server name and fragment
 758          *
 759          * @return string the URL
 760          * @param string $query an optional query string
 761          * @access public
 762          */
 763         function escapeFullURL( $query = '' ) {
 764                 return htmlspecialchars( $this->getFullURL( $query ) );
 765         }
 766
 767         /**
 768          * Get the URL form for an internal link.
 769          * - Used in various Squid-related code, in case we have a different
 770          * internal hostname for the server from the exposed one.
 771          *
 772          * @param string $query an optional query string
 773          * @return string the URL
 774          * @access public
 775          */
 776         function getInternalURL( $query = '' ) {
 777                 global $wgInternalServer;
 778                 $url = $wgInternalServer . $this->getLocalURL( $query );
 779                 wfRunHooks( 'GetInternalURL', array( &$this, &$url, $query ) );
 780                 return $url;
 781         }
 782
 783         /**
 784          * Get the edit URL for this Title
 785          * @return string the URL, or a null string if this is an
 786          *      interwiki link
 787          * @access public
 788          */
 789         function getEditURL() {
 790                 global $wgServer, $wgScript;
 791
 792                 if ( '' != $this->mInterwiki ) { return ''; }
 793                 $s = $this->getLocalURL( 'action=edit' );
 794
 795                 return $s;
 796         }
 797
 798         /**
 799          * Get the HTML-escaped displayable text form.
 800          * Used for the title field in <a> tags.
 801          * @return string the text, including any prefixes
 802          * @access public
 803          */
 804         function getEscapedText() {
 805                 return htmlspecialchars( $this->getPrefixedText() );
 806         }
 807
 808         /**
 809          * Is this Title interwiki?
 810          * @return boolean
 811          * @access public
 812          */
 813         function isExternal() { return ( '' != $this->mInterwiki ); }
 814
 815         /**
 816          * Does the title correspond to a protected article?
 817          * @param string $what the action the page is protected from,
 818          *      by default checks move and edit
 819          * @return boolean
 820          * @access public
 821          */
 822         function isProtected($action = '') {
 823                 if ( -1 == $this->mNamespace ) { return true; }
 824                 if($action == 'edit' || $action == '') {
 825                         $a = $this->getRestrictions("edit");
 826                         if ( in_array( 'sysop', $a ) ) { return true; }
 827                 }
 828                 if($action == 'move' || $action == '') {
 829                         $a = $this->getRestrictions("move");
 830                         if ( in_array( 'sysop', $a ) ) { return true; }
 831                 }
 832                 return false;
 833         }
 834
 835         /**
 836          * Is $wgUser is watching this page?
 837          * @return boolean
 838          * @access public
 839          */
 840         function userIsWatching() {
 841                 global $wgUser;
 842
 843                 if ( is_null( $this->mWatched ) ) {
 844                         if ( -1 == $this->mNamespace || 0 == $wgUser->getID()) {
 845                                 $this->mWatched = false;
 846                         } else {
 847                                 $this->mWatched = $wgUser->isWatched( $this );
 848                         }
 849                 }
 850                 return $this->mWatched;
 851         }
 852
 853         /**
 854          * Can $wgUser perform $action this page?
 855          * @param string $action action that permission needs to be checked for
 856          * @return boolean
 857          * @access private
 858          */
 859         function userCan($action) {
 860                 $fname = 'Title::userCan';
 861                 wfProfileIn( $fname );
 862
 863                 global $wgUser;
 864                 if( NS_SPECIAL == $this->mNamespace ) {
 865                         wfProfileOut( $fname );
 866                         return false;
 867                 }
 868                 // XXX: This is the code that prevents unprotecting a page in NS_MEDIAWIKI
 869                 // from taking effect -ævar
 870                 if( NS_MEDIAWIKI == $this->mNamespace &&
 871                     !$wgUser->isAllowed('editinterface') ) {
 872                         wfProfileOut( $fname );
 873                         return false;
 874                 }
 875
 876                 if( $this->mDbkeyform == '_' ) {
 877                         # FIXME: Is this necessary? Shouldn't be allowed anyway...
 878                         wfProfileOut( $fname );
 879                         return false;
 880                 }
 881
 882                 # protect global styles and js
 883                 if ( NS_MEDIAWIKI == $this->mNamespace
 884                  && preg_match("/\\.(css|js)$/", $this->mTextform )
 885                      && !$wgUser->isAllowed('editinterface') ) {
 886                         wfProfileOut( $fname );
 887                         return false;
 888                 }
 889
 890                 # protect css/js subpages of user pages
 891                 # XXX: this might be better using restrictions
 892                 # XXX: Find a way to work around the php bug that prevents using $this->userCanEditCssJsSubpage() from working
 893                 if( NS_USER == $this->mNamespace
 894                         && preg_match("/\\.(css|js)$/", $this->mTextform )
 895                         && !$wgUser->isAllowed('editinterface')
 896                         && !preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) ) {
 897                         wfProfileOut( $fname );
 898                         return false;
 899                 }
 900
 901                 foreach( $this->getRestrictions($action) as $right ) {
 902                         // Backwards compatibility, rewrite sysop -> protect
 903                         if ( $right == 'sysop' ) {
 904                                 $right = 'protect';
 905                         }
 906                         if( '' != $right && !$wgUser->isAllowed( $right ) ) {
 907                                 wfProfileOut( $fname );
 908                                 return false;
 909                         }
 910                 }
 911
 912                 if( $action == 'move' &&
 913                         !( $this->isMovable() && $wgUser->isAllowed( 'move' ) ) ) {
 914                         wfProfileOut( $fname );
 915                         return false;
 916                 }
 917
 918                 if( $action == 'create' ) {
 919                         if( (  $this->isTalkPage() && !$wgUser->isAllowed( 'createtalk' ) ) ||
 920                                 ( !$this->isTalkPage() && !$wgUser->isAllowed( 'createpage' ) ) ) {
 921                                 return false;
 922                         }
 923                 }
 924
 925                 wfProfileOut( $fname );
 926                 return true;
 927         }
 928
 929         /**
 930          * Can $wgUser edit this page?
 931          * @return boolean
 932          * @access public
 933          */
 934         function userCanEdit() {
 935                 return $this->userCan('edit');
 936         }
 937
 938         /**
 939          * Can $wgUser move this page?
 940          * @return boolean
 941          * @access public
 942          */
 943         function userCanMove() {
 944                 return $this->userCan('move');
 945         }
 946
 947         /**
 948          * Would anybody with sufficient privileges be able to move this page?
 949          * Some pages just aren't movable.
 950          *
 951          * @return boolean
 952          * @access public
 953          */
 954         function isMovable() {
 955                 return Namespace::isMovable( $this->getNamespace() )
 956                         && $this->getInterwiki() == '';
 957         }
 958
 959         /**
 960          * Can $wgUser read this page?
 961          * @return boolean
 962          * @access public
 963          */
 964         function userCanRead() {
 965                 global $wgUser;
 966
 967                 if( $wgUser->isAllowed('read') ) {
 968                         return true;
 969                 } else {
 970                         global $wgWhitelistRead;
 971
 972                         /** If anon users can create an account,
 973                             they need to reach the login page first! */
 974                         if( $wgUser->isAllowed( 'createaccount' )
 975                             && $this->getNamespace() == NS_SPECIAL
 976                             && $this->getText() == 'Userlogin' ) {
 977                                 return true;
 978                         }
 979
 980                         /** some pages are explicitly allowed */
 981                         $name = $this->getPrefixedText();
 982                         if( $wgWhitelistRead && in_array( $name, $wgWhitelistRead ) ) {
 983                                 return true;
 984                         }
 985
 986                         # Compatibility with old settings
 987                         if( $wgWhitelistRead && $this->getNamespace() == NS_MAIN ) {
 988                                 if( in_array( ':' . $name, $wgWhitelistRead ) ) {
 989                                         return true;
 990                                 }
 991                         }
 992                 }
 993                 return false;
 994         }
 995
 996         /**
 997          * Is this a talk page of some sort?
 998          * @return bool
 999          * @access public
1000          */
1001         function isTalkPage() {
1002                 return Namespace::isTalk( $this->getNamespace() );
1003         }
1004
1005         /**
1006          * Is this a .css or .js subpage of a user page?
1007          * @return bool
1008          * @access public
1009          */
1010         function isCssJsSubpage() {
1011                 return ( NS_USER == $this->mNamespace and preg_match("/\\.(css|js)$/", $this->mTextform ) );
1012         }
1013         /**
1014          * Is this a .css subpage of a user page?
1015          * @return bool
1016          * @access public
1017          */
1018         function isCssSubpage() {
1019                 return ( NS_USER == $this->mNamespace and preg_match("/\\.css$/", $this->mTextform ) );
1020         }
1021         /**
1022          * Is this a .js subpage of a user page?
1023          * @return bool
1024          * @access public
1025          */
1026         function isJsSubpage() {
1027                 return ( NS_USER == $this->mNamespace and preg_match("/\\.js$/", $this->mTextform ) );
1028         }
1029         /**
1030          * Protect css/js subpages of user pages: can $wgUser edit
1031          * this page?
1032          *
1033          * @return boolean
1034          * @todo XXX: this might be better using restrictions
1035          * @access public
1036          */
1037         function userCanEditCssJsSubpage() {
1038                 global $wgUser;
1039                 return ( $wgUser->isAllowed('editinterface') or preg_match('/^'.preg_quote($wgUser->getName(), '/').'\//', $this->mTextform) );
1040         }
1041
1042         /**
1043          * Loads a string into mRestrictions array
1044          * @param string $res restrictions in string format
1045          * @access public
1046          */
1047         function loadRestrictions( $res ) {
1048                 foreach( explode( ':', trim( $res ) ) as $restrict ) {
1049                         $temp = explode( '=', trim( $restrict ) );
1050                         if(count($temp) == 1) {
1051                                 // old format should be treated as edit/move restriction
1052                                 $this->mRestrictions["edit"] = explode( ',', trim( $temp[0] ) );
1053                                 $this->mRestrictions["move"] = explode( ',', trim( $temp[0] ) );
1054                         } else {
1055                                 $this->mRestrictions[$temp[0]] = explode( ',', trim( $temp[1] ) );
1056                         }
1057                 }
1058                 $this->mRestrictionsLoaded = true;
1059         }
1060
1061         /**
1062          * Accessor/initialisation for mRestrictions
1063          * @param string $action action that permission needs to be checked for
1064          * @return array the array of groups allowed to edit this article
1065          * @access public
1066          */
1067         function getRestrictions($action) {
1068                 $id = $this->getArticleID();
1069                 if ( 0 == $id ) { return array(); }
1070
1071                 if ( ! $this->mRestrictionsLoaded ) {
1072                         $dbr =& wfGetDB( DB_SLAVE );
1073                         $res = $dbr->selectField( 'page', 'page_restrictions', 'page_id='.$id );
1074                         $this->loadRestrictions( $res );
1075                 }
1076                 if( isset( $this->mRestrictions[$action] ) ) {
1077                         return $this->mRestrictions[$action];
1078                 }
1079                 return array();
1080         }
1081
1082         /**
1083          * Is there a version of this page in the deletion archive?
1084          * @return int the number of archived revisions
1085          * @access public
1086          */
1087         function isDeleted() {
1088                 $fname = 'Title::isDeleted';
1089                 if ( $this->getNamespace() < 0 ) {
1090                         $n = 0;
1091                 } else {
1092                         $dbr =& wfGetDB( DB_SLAVE );
1093                         $n = $dbr->selectField( 'archive', 'COUNT(*)', array( 'ar_namespace' => $this->getNamespace(),
1094                                 'ar_title' => $this->getDBkey() ), $fname );
1095                 }
1096                 return (int)$n;
1097         }
1098
1099         /**
1100          * Get the article ID for this Title from the link cache,
1101          * adding it if necessary
1102          * @param int $flags a bit field; may be GAID_FOR_UPDATE to select
1103          *      for update
1104          * @return int the ID
1105          * @access public
1106          */
1107         function getArticleID( $flags = 0 ) {
1108                 $linkCache =& LinkCache::singleton();
1109                 if ( $flags & GAID_FOR_UPDATE ) {
1110                         $oldUpdate = $linkCache->forUpdate( true );
1111                         $this->mArticleID = $linkCache->addLinkObj( $this );
1112                         $linkCache->forUpdate( $oldUpdate );
1113                 } else {
1114                         if ( -1 == $this->mArticleID ) {
1115                                 $this->mArticleID = $linkCache->addLinkObj( $this );
1116                         }
1117                 }
1118                 return $this->mArticleID;
1119         }
1120
1121         function getLatestRevID() {
1122                 if ($this->mLatestID !== false)
1123                         return $this->mLatestID;
1124
1125                 $db =& wfGetDB(DB_SLAVE);
1126                 return $this->mLatestID = $db->selectField( 'revision',
1127                         "max(rev_id)",
1128                         array('rev_page' => $this->getArticleID()),
1129                         'Title::getLatestRevID' );
1130         }
1131
1132         /**
1133          * This clears some fields in this object, and clears any associated
1134          * keys in the "bad links" section of the link cache.
1135          *
1136          * - This is called from Article::insertNewArticle() to allow
1137          * loading of the new page_id. It's also called from
1138          * Article::doDeleteArticle()
1139          *
1140          * @param int $newid the new Article ID
1141          * @access public
1142          */
1143         function resetArticleID( $newid ) {
1144                 $linkCache =& LinkCache::singleton();
1145                 $linkCache->clearBadLink( $this->getPrefixedDBkey() );
1146
1147                 if ( 0 == $newid ) { $this->mArticleID = -1; }
1148                 else { $this->mArticleID = $newid; }
1149                 $this->mRestrictionsLoaded = false;
1150                 $this->mRestrictions = array();
1151         }
1152
1153         /**
1154          * Updates page_touched for this page; called from LinksUpdate.php
1155          * @return bool true if the update succeded
1156          * @access public
1157          */
1158         function invalidateCache() {
1159                 global $wgUseFileCache;
1160
1161                 if ( wfReadOnly() ) {
1162                         return;
1163                 }
1164
1165                 $dbw =& wfGetDB( DB_MASTER );
1166                 $success = $dbw->update( 'page',
1167                         array( /* SET */
1168                                 'page_touched' => $dbw->timestamp()
1169                         ), array( /* WHERE */
1170                                 'page_namespace' => $this->getNamespace() ,
1171                                 'page_title' => $this->getDBkey()
1172                         ), 'Title::invalidateCache'
1173                 );
1174
1175                 if ($wgUseFileCache) {
1176                         $cache = new CacheManager($this);
1177                         @unlink($cache->fileCacheName());
1178                 }
1179
1180                 return $success;
1181         }
1182
1183         /**
1184          * Prefix some arbitrary text with the namespace or interwiki prefix
1185          * of this object
1186          *
1187          * @param string $name the text
1188          * @return string the prefixed text
1189          * @access private
1190          */
1191         /* private */ function prefix( $name ) {
1192                 global $wgContLang;
1193
1194                 $p = '';
1195                 if ( '' != $this->mInterwiki ) {
1196                         $p = $this->mInterwiki . ':';
1197                 }
1198                 if ( 0 != $this->mNamespace ) {
1199                         $p .= $wgContLang->getNsText( $this->mNamespace ) . ':';
1200                 }
1201                 return $p . $name;
1202         }
1203
1204         /**
1205          * Secure and split - main initialisation function for this object
1206          *
1207          * Assumes that mDbkeyform has been set, and is urldecoded
1208          * and uses underscores, but not otherwise munged.  This function
1209          * removes illegal characters, splits off the interwiki and
1210          * namespace prefixes, sets the other forms, and canonicalizes
1211          * everything.
1212          * @return bool true on success
1213          * @access private
1214          */
1215         /* private */ function secureAndSplit() {
1216                 global $wgContLang, $wgLocalInterwiki, $wgCapitalLinks;
1217                 $fname = 'Title::secureAndSplit';
1218                 wfProfileIn( $fname );
1219
1220                 # Initialisation
1221                 static $rxTc = false;
1222                 if( !$rxTc ) {
1223                         # % is needed as well
1224                         $rxTc = '/[^' . Title::legalChars() . ']|%[0-9A-Fa-f]{2}/S';
1225                 }
1226
1227                 $this->mInterwiki = $this->mFragment = '';
1228                 $this->mNamespace = $this->mDefaultNamespace; # Usually NS_MAIN
1229
1230                 # Clean up whitespace
1231                 #
1232                 $t = preg_replace( '/[ _]+/', '_', $this->mDbkeyform );
1233                 $t = trim( $t, '_' );
1234
1235                 if ( '' == $t ) {
1236                         wfProfileOut( $fname );
1237                         return false;
1238                 }
1239
1240                 if( false !== strpos( $t, UTF8_REPLACEMENT ) ) {
1241                         # Contained illegal UTF-8 sequences or forbidden Unicode chars.
1242                         wfProfileOut( $fname );
1243                         return false;
1244                 }
1245
1246                 $this->mDbkeyform = $t;
1247
1248                 # Initial colon indicates main namespace rather than specified default
1249                 # but should not create invalid {ns,title} pairs such as {0,Project:Foo}
1250                 if ( ':' == $t{0} ) {
1251                         $this->mNamespace = NS_MAIN;
1252                         $t = substr( $t, 1 ); # remove the colon but continue processing
1253                 }
1254
1255                 # Namespace or interwiki prefix
1256                 $firstPass = true;
1257                 do {
1258                         if ( preg_match( "/^(.+?)_*:_*(.*)$/S", $t, $m ) ) {
1259                                 $p = $m[1];
1260                                 $lowerNs = strtolower( $p );
1261                                 if ( $ns = Namespace::getCanonicalIndex( $lowerNs ) ) {
1262                                         # Canonical namespace
1263                                         $t = $m[2];
1264                                         $this->mNamespace = $ns;
1265                                 } elseif ( $ns = $wgContLang->getNsIndex( $lowerNs )) {
1266                                         # Ordinary namespace
1267                                         $t = $m[2];
1268                                         $this->mNamespace = $ns;
1269                                 } elseif( $this->getInterwikiLink( $p ) ) {
1270                                         if( !$firstPass ) {
1271                                                 # Can't make a local interwiki link to an interwiki link.
1272                                                 # That's just crazy!
1273                                                 wfProfileOut( $fname );
1274                                                 return false;
1275                                         }
1276
1277                                         # Interwiki link
1278                                         $t = $m[2];
1279                                         $this->mInterwiki = strtolower( $p );
1280
1281                                         # Redundant interwiki prefix to the local wiki
1282                                         if ( 0 == strcasecmp( $this->mInterwiki, $wgLocalInterwiki ) ) {
1283                                                 if( $t == '' ) {
1284                                                         # Can't have an empty self-link
1285                                                         wfProfileOut( $fname );
1286                                                         return false;
1287                                                 }
1288                                                 $this->mInterwiki = '';
1289                                                 $firstPass = false;
1290                                                 # Do another namespace split...
1291                                                 continue;
1292                                         }
1293                                 }
1294                                 # If there's no recognized interwiki or namespace,
1295                                 # then let the colon expression be part of the title.
1296                         }
1297                         break;
1298                 } while( true );
1299                 $r = $t;
1300
1301                 # We already know that some pages won't be in the database!
1302                 #
1303                 if ( '' != $this->mInterwiki || -1 == $this->mNamespace ) {
1304                         $this->mArticleID = 0;
1305                 }
1306                 $f = strstr( $r, '#' );
1307                 if ( false !== $f ) {
1308                         $this->mFragment = substr( $f, 1 );
1309                         $r = substr( $r, 0, strlen( $r ) - strlen( $f ) );
1310                         # remove whitespace again: prevents "Foo_bar_#"
1311                         # becoming "Foo_bar_"
1312                         $r = preg_replace( '/_*$/', '', $r );
1313                 }
1314
1315                 # Reject illegal characters.
1316                 #
1317                 if( preg_match( $rxTc, $r ) ) {
1318                         wfProfileOut( $fname );
1319                         return false;
1320                 }
1321
1322                 /**
1323                  * Pages with "/./" or "/../" appearing in the URLs will
1324                  * often be unreachable due to the way web browsers deal
1325                  * with 'relative' URLs. Forbid them explicitly.
1326                  */
1327                 if ( strpos( $r, '.' ) !== false &&
1328                      ( $r === '.' || $r === '..' ||
1329                        strpos( $r, './' ) === 0  ||
1330                        strpos( $r, '../' ) === 0 ||
1331                        strpos( $r, '/./' ) !== false ||
1332                        strpos( $r, '/../' ) !== false ) )
1333                 {
1334                         wfProfileOut( $fname );
1335                         return false;
1336                 }
1337
1338                 # We shouldn't need to query the DB for the size.
1339                 #$maxSize = $dbr->textFieldSize( 'page', 'page_title' );
1340                 if ( strlen( $r ) > 255 ) {
1341                         wfProfileOut( $fname );
1342                         return false;
1343                 }
1344
1345                 /**
1346                  * Normally, all wiki links are forced to have
1347                  * an initial capital letter so [[foo]] and [[Foo]]
1348                  * point to the same place.
1349                  *
1350                  * Don't force it for interwikis, since the other
1351                  * site might be case-sensitive.
1352                  */
1353                 if( $wgCapitalLinks && $this->mInterwiki == '') {
1354                         $t = $wgContLang->ucfirst( $r );
1355                 } else {
1356                         $t = $r;
1357                 }
1358
1359                 /**
1360                  * Can't make a link to a namespace alone...
1361                  * "empty" local links can only be self-links
1362                  * with a fragment identifier.
1363                  */
1364                 if( $t == '' &&
1365                         $this->mInterwiki == '' &&
1366                         $this->mNamespace != NS_MAIN ) {
1367                         wfProfileOut( $fname );
1368                         return false;
1369                 }
1370
1371                 # Fill fields
1372                 $this->mDbkeyform = $t;
1373                 $this->mUrlform = wfUrlencode( $t );
1374
1375                 $this->mTextform = str_replace( '_', ' ', $t );
1376
1377                 wfProfileOut( $fname );
1378                 return true;
1379         }
1380
1381         /**
1382          * Get a Title object associated with the talk page of this article
1383          * @return Title the object for the talk page
1384          * @access public
1385          */
1386         function getTalkPage() {
1387                 return Title::makeTitle( Namespace::getTalk( $this->getNamespace() ), $this->getDBkey() );
1388         }
1389
1390         /**
1391          * Get a title object associated with the subject page of this
1392          * talk page
1393          *
1394          * @return Title the object for the subject page
1395          * @access public
1396          */
1397         function getSubjectPage() {
1398                 return Title::makeTitle( Namespace::getSubject( $this->getNamespace() ), $this->getDBkey() );
1399         }
1400
1401         /**
1402          * Get an array of Title objects linking to this Title
1403          * Also stores the IDs in the link cache.
1404          *
1405          * @param string $options may be FOR UPDATE
1406          * @return array the Title objects linking here
1407          * @access public
1408          */
1409         function getLinksTo( $options = '', $table = 'pagelinks', $prefix = 'pl' ) {
1410                 $linkCache =& LinkCache::singleton();
1411                 $id = $this->getArticleID();
1412
1413                 if ( $options ) {
1414                         $db =& wfGetDB( DB_MASTER );
1415                 } else {
1416                         $db =& wfGetDB( DB_SLAVE );
1417                 }
1418
1419                 $res = $db->select( array( 'page', $table ),
1420                         array( 'page_namespace', 'page_title', 'page_id' ),
1421                         array(
1422                                 "{$prefix}_from=page_id",
1423                                 "{$prefix}_namespace" => $this->getNamespace(),
1424                                 "{$prefix}_title"     => $this->getDbKey() ),
1425                         'Title::getLinksTo',
1426                         $options );
1427
1428                 $retVal = array();
1429                 if ( $db->numRows( $res ) ) {
1430                         while ( $row = $db->fetchObject( $res ) ) {
1431                                 if ( $titleObj = Title::makeTitle( $row->page_namespace, $row->page_title ) ) {
1432                                         $linkCache->addGoodLinkObj( $row->page_id, $titleObj );
1433                                         $retVal[] = $titleObj;
1434                                 }
1435                         }
1436                 }
1437                 $db->freeResult( $res );
1438                 return $retVal;
1439         }
1440
1441         /**
1442          * Get an array of Title objects using this Title as a template
1443          * Also stores the IDs in the link cache.
1444          *
1445          * @param string $options may be FOR UPDATE
1446          * @return array the Title objects linking here
1447          * @access public
1448          */
1449         function getTemplateLinksTo( $options = '' ) {
1450                 return $this->getLinksTo( $options, 'templatelinks', 'tl' );
1451         }
1452
1453         /**
1454          * Get an array of Title objects referring to non-existent articles linked from this page
1455          *
1456          * @param string $options may be FOR UPDATE
1457          * @return array the Title objects
1458          * @access public
1459          */
1460         function getBrokenLinksFrom( $options = '' ) {
1461                 if ( $options ) {
1462                         $db =& wfGetDB( DB_MASTER );
1463                 } else {
1464                         $db =& wfGetDB( DB_SLAVE );
1465                 }
1466
1467                 $res = $db->safeQuery(
1468                           "SELECT pl_namespace, pl_title
1469                              FROM !
1470                         LEFT JOIN !
1471                                ON pl_namespace=page_namespace
1472                               AND pl_title=page_title
1473                             WHERE pl_from=?
1474                               AND page_namespace IS NULL
1475                                   !",
1476                         $db->tableName( 'pagelinks' ),
1477                         $db->tableName( 'page' ),
1478                         $this->getArticleId(),
1479                         $options );
1480
1481                 $retVal = array();
1482                 if ( $db->numRows( $res ) ) {
1483                         while ( $row = $db->fetchObject( $res ) ) {
1484                                 $retVal[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
1485                         }
1486                 }
1487                 $db->freeResult( $res );
1488                 return $retVal;
1489         }
1490
1491
1492         /**
1493          * Get a list of URLs to purge from the Squid cache when this
1494          * page changes
1495          *
1496          * @return array the URLs
1497          * @access public
1498          */
1499         function getSquidURLs() {
1500                 return array(
1501                         $this->getInternalURL(),
1502                         $this->getInternalURL( 'action=history' )
1503                 );
1504         }
1505
1506         /**
1507          * Move this page without authentication
1508          * @param Title &$nt the new page Title
1509          * @access public
1510          */
1511         function moveNoAuth( &$nt ) {
1512                 return $this->moveTo( $nt, false );
1513         }
1514
1515         /**
1516          * Check whether a given move operation would be valid.
1517          * Returns true if ok, or a message key string for an error message
1518          * if invalid. (Scarrrrry ugly interface this.)
1519          * @param Title &$nt the new title
1520          * @param bool $auth indicates whether $wgUser's permissions
1521          *      should be checked
1522          * @return mixed true on success, message name on failure
1523          * @access public
1524          */
1525         function isValidMoveOperation( &$nt, $auth = true ) {
1526                 global $wgUser;
1527                 if( !$this or !$nt ) {
1528                         return 'badtitletext';
1529                 }
1530                 if( $this->equals( $nt ) ) {
1531                         return 'selfmove';
1532                 }
1533                 if( !$this->isMovable() || !$nt->isMovable() ) {
1534                         return 'immobile_namespace';
1535                 }
1536
1537                 $oldid = $this->getArticleID();
1538                 $newid = $nt->getArticleID();
1539
1540                 if ( strlen( $nt->getDBkey() ) < 1 ) {
1541                         return 'articleexists';
1542                 }
1543                 if ( ( '' == $this->getDBkey() ) ||
1544                          ( !$oldid ) ||
1545                      ( '' == $nt->getDBkey() ) ) {
1546                         return 'badarticleerror';
1547                 }
1548
1549                 if ( $auth && (
1550                                 !$this->userCanEdit() || !$nt->userCanEdit() ||
1551                                 !$this->userCanMove() || !$nt->userCanMove() ) ) {
1552                         return 'protectedpage';
1553                 }
1554
1555                 # The move is allowed only if (1) the target doesn't exist, or
1556                 # (2) the target is a redirect to the source, and has no history
1557                 # (so we can undo bad moves right after they're done).
1558
1559                 if ( 0 != $newid ) { # Target exists; check for validity
1560                         if ( ! $this->isValidMoveTarget( $nt ) ) {
1561                                 return 'articleexists';
1562                         }
1563                 }
1564                 return true;
1565         }
1566
1567         /**
1568          * Move a title to a new location
1569          * @param Title &$nt the new title
1570          * @param bool $auth indicates whether $wgUser's permissions
1571          *      should be checked
1572          * @return mixed true on success, message name on failure
1573          * @access public
1574          */
1575         function moveTo( &$nt, $auth = true, $reason = '' ) {
1576                 $err = $this->isValidMoveOperation( $nt, $auth );
1577                 if( is_string( $err ) ) {
1578                         return $err;
1579                 }
1580
1581                 $pageid = $this->getArticleID();
1582                 if( $nt->exists() ) {
1583                         $this->moveOverExistingRedirect( $nt, $reason );
1584                         $pageCountChange = 0;
1585                 } else { # Target didn't exist, do normal move.
1586                         $this->moveToNewTitle( $nt, $reason );
1587                         $pageCountChange = 1;
1588                 }
1589                 $redirid = $this->getArticleID();
1590
1591                 # Fixing category links (those without piped 'alternate' names) to be sorted under the new title
1592                 $dbw =& wfGetDB( DB_MASTER );
1593                 $categorylinks = $dbw->tableName( 'categorylinks' );
1594                 $sql = "UPDATE $categorylinks SET cl_sortkey=" . $dbw->addQuotes( $nt->getPrefixedText() ) .
1595                         " WHERE cl_from=" . $dbw->addQuotes( $pageid ) .
1596                         " AND cl_sortkey=" . $dbw->addQuotes( $this->getPrefixedText() );
1597                 $dbw->query( $sql, 'SpecialMovepage::doSubmit' );
1598
1599                 # Update watchlists
1600
1601                 $oldnamespace = $this->getNamespace() & ~1;
1602                 $newnamespace = $nt->getNamespace() & ~1;
1603                 $oldtitle = $this->getDBkey();
1604                 $newtitle = $nt->getDBkey();
1605
1606                 if( $oldnamespace != $newnamespace || $oldtitle != $newtitle ) {
1607                         WatchedItem::duplicateEntries( $this, $nt );
1608                 }
1609
1610                 # Update search engine
1611                 $u = new SearchUpdate( $pageid, $nt->getPrefixedDBkey() );
1612                 $u->doUpdate();
1613                 $u = new SearchUpdate( $redirid, $this->getPrefixedDBkey(), '' );
1614                 $u->doUpdate();
1615
1616                 # Update site_stats
1617                 if ( $this->getNamespace() == NS_MAIN and $nt->getNamespace() != NS_MAIN ) {
1618                         # Moved out of main namespace
1619                         # not viewed, edited, removing
1620                         $u = new SiteStatsUpdate( 0, 1, -1, $pageCountChange);
1621                 } elseif ( $this->getNamespace() != NS_MAIN and $nt->getNamespace() == NS_MAIN ) {
1622                         # Moved into main namespace
1623                         # not viewed, edited, adding
1624                         $u = new SiteStatsUpdate( 0, 1, +1, $pageCountChange );
1625                 } elseif ( $pageCountChange ) {
1626                         # Added redirect
1627                         $u = new SiteStatsUpdate( 0, 0, 0, 1 );
1628                 } else{
1629                         $u = false;
1630                 }
1631                 if ( $u ) {
1632                         $u->doUpdate();
1633                 }
1634
1635                 global $wgUser;
1636                 wfRunHooks( 'TitleMoveComplete', array( &$this, &$nt, &$wgUser, $pageid, $redirid ) );
1637                 return true;
1638         }
1639
1640         /**
1641          * Move page to a title which is at present a redirect to the
1642          * source page
1643          *
1644          * @param Title &$nt the page to move to, which should currently
1645          *      be a redirect
1646          * @access private
1647          */
1648         function moveOverExistingRedirect( &$nt, $reason = '' ) {
1649                 global $wgUser, $wgUseSquid, $wgMwRedir;
1650                 $fname = 'Title::moveOverExistingRedirect';
1651                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1652
1653                 if ( $reason ) {
1654                         $comment .= ": $reason";
1655                 }
1656
1657                 $now = wfTimestampNow();
1658                 $rand = wfRandom();
1659                 $newid = $nt->getArticleID();
1660                 $oldid = $this->getArticleID();
1661                 $dbw =& wfGetDB( DB_MASTER );
1662                 $linkCache =& LinkCache::singleton();
1663
1664                 # Delete the old redirect. We don't save it to history since
1665                 # by definition if we've got here it's rather uninteresting.
1666                 # We have to remove it so that the next step doesn't trigger
1667                 # a conflict on the unique namespace+title index...
1668                 $dbw->delete( 'page', array( 'page_id' => $newid ), $fname );
1669
1670                 # Save a null revision in the page's history notifying of the move
1671                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1672                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1673                         true );
1674                 $nullRevId = $nullRevision->insertOn( $dbw );
1675
1676                 # Change the name of the target page:
1677                 $dbw->update( 'page',
1678                         /* SET */ array(
1679                                 'page_touched'   => $dbw->timestamp($now),
1680                                 'page_namespace' => $nt->getNamespace(),
1681                                 'page_title'     => $nt->getDBkey(),
1682                                 'page_latest'    => $nullRevId,
1683                         ),
1684                         /* WHERE */ array( 'page_id' => $oldid ),
1685                         $fname
1686                 );
1687                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
1688
1689                 # Recreate the redirect, this time in the other direction.
1690                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1691                 $redirectArticle = new Article( $this );
1692                 $newid = $redirectArticle->insertOn( $dbw );
1693                 $redirectRevision = new Revision( array(
1694                         'page'    => $newid,
1695                         'comment' => $comment,
1696                         'text'    => $redirectText ) );
1697                 $revid = $redirectRevision->insertOn( $dbw );
1698                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1699                 $linkCache->clearLink( $this->getPrefixedDBkey() );
1700
1701                 # Log the move
1702                 $log = new LogPage( 'move' );
1703                 $log->addEntry( 'move_redir', $this, $reason, array( 1 => $nt->getPrefixedText() ) );
1704
1705                 # Now, we record the link from the redirect to the new title.
1706                 # It should have no other outgoing links...
1707                 $dbw->delete( 'pagelinks', array( 'pl_from' => $newid ), $fname );
1708                 $dbw->insert( 'pagelinks',
1709                         array(
1710                                 'pl_from'      => $newid,
1711                                 'pl_namespace' => $nt->getNamespace(),
1712                                 'pl_title'     => $nt->getDbKey() ),
1713                         $fname );
1714
1715                 # Purge squid
1716                 if ( $wgUseSquid ) {
1717                         $urls = array_merge( $nt->getSquidURLs(), $this->getSquidURLs() );
1718                         $u = new SquidUpdate( $urls );
1719                         $u->doUpdate();
1720                 }
1721         }
1722
1723         /**
1724          * Move page to non-existing title.
1725          * @param Title &$nt the new Title
1726          * @access private
1727          */
1728         function moveToNewTitle( &$nt, $reason = '' ) {
1729                 global $wgUser, $wgUseSquid;
1730                 global $wgMwRedir;
1731                 $fname = 'MovePageForm::moveToNewTitle';
1732                 $comment = wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() );
1733                 if ( $reason ) {
1734                         $comment .= ": $reason";
1735                 }
1736
1737                 $newid = $nt->getArticleID();
1738                 $oldid = $this->getArticleID();
1739                 $dbw =& wfGetDB( DB_MASTER );
1740                 $now = $dbw->timestamp();
1741                 $rand = wfRandom();
1742                 $linkCache =& LinkCache::singleton();
1743
1744                 # Save a null revision in the page's history notifying of the move
1745                 $nullRevision = Revision::newNullRevision( $dbw, $oldid,
1746                         wfMsgForContent( '1movedto2', $this->getPrefixedText(), $nt->getPrefixedText() ),
1747                         true );
1748                 $nullRevId = $nullRevision->insertOn( $dbw );
1749
1750                 # Rename cur entry
1751                 $dbw->update( 'page',
1752                         /* SET */ array(
1753                                 'page_touched'   => $now,
1754                                 'page_namespace' => $nt->getNamespace(),
1755                                 'page_title'     => $nt->getDBkey(),
1756                                 'page_latest'    => $nullRevId,
1757                         ),
1758                         /* WHERE */ array( 'page_id' => $oldid ),
1759                         $fname
1760                 );
1761
1762                 $linkCache->clearLink( $nt->getPrefixedDBkey() );
1763
1764                 # Insert redirect
1765                 $redirectText = $wgMwRedir->getSynonym( 0 ) . ' [[' . $nt->getPrefixedText() . "]]\n";
1766                 $redirectArticle = new Article( $this );
1767                 $newid = $redirectArticle->insertOn( $dbw );
1768                 $redirectRevision = new Revision( array(
1769                         'page'    => $newid,
1770                         'comment' => $comment,
1771                         'text'    => $redirectText ) );
1772                 $revid = $redirectRevision->insertOn( $dbw );
1773                 $redirectArticle->updateRevisionOn( $dbw, $redirectRevision, 0 );
1774                 $linkCache->clearLink( $this->getPrefixedDBkey() );
1775
1776                 # Log the move
1777                 $log = new LogPage( 'move' );
1778                 $log->addEntry( 'move', $this, $reason, array( 1 => $nt->getPrefixedText()) );
1779
1780                 # Purge caches as per article creation
1781                 Article::onArticleCreate( $nt );
1782
1783                 # Record the just-created redirect's linking to the page
1784                 $dbw->insert( 'pagelinks',
1785                         array(
1786                                 'pl_from'      => $newid,
1787                                 'pl_namespace' => $nt->getNamespace(),
1788                                 'pl_title'     => $nt->getDBkey() ),
1789                         $fname );
1790
1791                 # Non-existent target may have had broken links to it; these must
1792                 # now be touched to update link coloring.
1793                 $nt->touchLinks();
1794
1795                 # Purge old title from squid
1796                 # The new title, and links to the new title, are purged in Article::onArticleCreate()
1797                 $titles = $nt->getLinksTo();
1798                 if ( $wgUseSquid ) {
1799                         $urls = $this->getSquidURLs();
1800                         foreach ( $titles as $linkTitle ) {
1801                                 $urls[] = $linkTitle->getInternalURL();
1802                         }
1803                         $u = new SquidUpdate( $urls );
1804                         $u->doUpdate();
1805                 }
1806         }
1807
1808         /**
1809          * Checks if $this can be moved to a given Title
1810          * - Selects for update, so don't call it unless you mean business
1811          *
1812          * @param Title &$nt the new title to check
1813          * @access public
1814          */
1815         function isValidMoveTarget( $nt ) {
1816
1817                 $fname = 'Title::isValidMoveTarget';
1818                 $dbw =& wfGetDB( DB_MASTER );
1819
1820                 # Is it a redirect?
1821                 $id  = $nt->getArticleID();
1822                 $obj = $dbw->selectRow( array( 'page', 'revision', 'text'),
1823                         array( 'page_is_redirect','old_text','old_flags' ),
1824                         array( 'page_id' => $id, 'page_latest=rev_id', 'rev_text_id=old_id' ),
1825                         $fname, 'FOR UPDATE' );
1826
1827                 if ( !$obj || 0 == $obj->page_is_redirect ) {
1828                         # Not a redirect
1829                         return false;
1830                 }
1831                 $text = Revision::getRevisionText( $obj );
1832
1833                 # Does the redirect point to the source?
1834                 if ( preg_match( "/\\[\\[\\s*([^\\]\\|]*)]]/", $text, $m ) ) {
1835                         $redirTitle = Title::newFromText( $m[1] );
1836                         if( !is_object( $redirTitle ) ||
1837                                 $redirTitle->getPrefixedDBkey() != $this->getPrefixedDBkey() ) {
1838                                 return false;
1839                         }
1840                 } else {
1841                         # Fail safe
1842                         return false;
1843                 }
1844
1845                 # Does the article have a history?
1846                 $row = $dbw->selectRow( array( 'page', 'revision'),
1847                         array( 'rev_id' ),
1848                         array( 'page_namespace' => $nt->getNamespace(),
1849                                 'page_title' => $nt->getDBkey(),
1850                                 'page_id=rev_page AND page_latest != rev_id'
1851                         ), $fname, 'FOR UPDATE'
1852                 );
1853
1854                 # Return true if there was no history
1855                 return $row === false;
1856         }
1857
1858         /**
1859          * Create a redirect; fails if the title already exists; does
1860          * not notify RC
1861          *
1862          * @param Title $dest the destination of the redirect
1863          * @param string $comment the comment string describing the move
1864          * @return bool true on success
1865          * @access public
1866          */
1867         function createRedirect( $dest, $comment ) {
1868                 global $wgUser;
1869                 if ( $this->getArticleID() ) {
1870                         return false;
1871                 }
1872
1873                 $fname = 'Title::createRedirect';
1874                 $dbw =& wfGetDB( DB_MASTER );
1875
1876                 $article = new Article( $this );
1877                 $newid = $article->insertOn( $dbw );
1878                 $revision = new Revision( array(
1879                         'page'      => $newid,
1880                         'comment'   => $comment,
1881                         'text'      => "#REDIRECT [[" . $dest->getPrefixedText() . "]]\n",
1882                         ) );
1883                 $revisionId = $revision->insertOn( $dbw );
1884                 $article->updateRevisionOn( $dbw, $revision, 0 );
1885
1886                 # Link table
1887                 $dbw->insert( 'pagelinks',
1888                         array(
1889                                 'pl_from'      => $newid,
1890                                 'pl_namespace' => $dest->getNamespace(),
1891                                 'pl_title'     => $dest->getDbKey()
1892                         ), $fname
1893                 );
1894
1895                 Article::onArticleCreate( $this );
1896                 return true;
1897         }
1898
1899         /**
1900          * Get categories to which this Title belongs and return an array of
1901          * categories' names.
1902          *
1903          * @return array an array of parents in the form:
1904          *      $parent => $currentarticle
1905          * @access public
1906          */
1907         function getParentCategories() {
1908                 global $wgContLang,$wgUser;
1909
1910                 $titlekey = $this->getArticleId();
1911                 $dbr =& wfGetDB( DB_SLAVE );
1912                 $categorylinks = $dbr->tableName( 'categorylinks' );
1913
1914                 # NEW SQL
1915                 $sql = "SELECT * FROM $categorylinks"
1916                      ." WHERE cl_from='$titlekey'"
1917                          ." AND cl_from <> '0'"
1918                          ." ORDER BY cl_sortkey";
1919
1920                 $res = $dbr->query ( $sql ) ;
1921
1922                 if($dbr->numRows($res) > 0) {
1923                         while ( $x = $dbr->fetchObject ( $res ) )
1924                                 //$data[] = Title::newFromText($wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to);
1925                                 $data[$wgContLang->getNSText ( NS_CATEGORY ).':'.$x->cl_to] = $this->getFullText();
1926                         $dbr->freeResult ( $res ) ;
1927                 } else {
1928                         $data = '';
1929                 }
1930                 return $data;
1931         }
1932
1933         /**
1934          * Get a tree of parent categories
1935          * @param array $children an array with the children in the keys, to check for circular refs
1936          * @return array
1937          * @access public
1938          */
1939         function getParentCategoryTree( $children = array() ) {
1940                 $parents = $this->getParentCategories();
1941
1942                 if($parents != '') {
1943                         foreach($parents as $parent => $current) {
1944                                 if ( array_key_exists( $parent, $children ) ) {
1945                                         # Circular reference
1946                                         $stack[$parent] = array();
1947                                 } else {
1948                                         $nt = Title::newFromText($parent);
1949                                         $stack[$parent] = $nt->getParentCategoryTree( $children + array($parent => 1) );
1950                                 }
1951                         }
1952                         return $stack;
1953                 } else {
1954                         return array();
1955                 }
1956         }
1957
1958
1959         /**
1960          * Get an associative array for selecting this title from
1961          * the "page" table
1962          *
1963          * @return array
1964          * @access public
1965          */
1966         function pageCond() {
1967                 return array( 'page_namespace' => $this->mNamespace, 'page_title' => $this->mDbkeyform );
1968         }
1969
1970         /**
1971          * Get the revision ID of the previous revision
1972          *
1973          * @param integer $revision  Revision ID. Get the revision that was before this one.
1974          * @return interger $oldrevision|false
1975          */
1976         function getPreviousRevisionID( $revision ) {
1977                 $dbr =& wfGetDB( DB_SLAVE );
1978                 return $dbr->selectField( 'revision', 'rev_id',
1979                         'rev_page=' . intval( $this->getArticleId() ) .
1980                         ' AND rev_id<' . intval( $revision ) . ' ORDER BY rev_id DESC' );
1981         }
1982
1983         /**
1984          * Get the revision ID of the next revision
1985          *
1986          * @param integer $revision  Revision ID. Get the revision that was after this one.
1987          * @return interger $oldrevision|false
1988          */
1989         function getNextRevisionID( $revision ) {
1990                 $dbr =& wfGetDB( DB_SLAVE );
1991                 return $dbr->selectField( 'revision', 'rev_id',
1992                         'rev_page=' . intval( $this->getArticleId() ) .
1993                         ' AND rev_id>' . intval( $revision ) . ' ORDER BY rev_id' );
1994         }
1995
1996         /**
1997          * Compare with another title.
1998          *
1999          * @param Title $title
2000          * @return bool
2001          */
2002         function equals( $title ) {
2003                 return $this->getInterwiki() == $title->getInterwiki()
2004                         && $this->getNamespace() == $title->getNamespace()
2005                         && $this->getDbkey() == $title->getDbkey();
2006         }
2007
2008         /**
2009          * Check if page exists
2010          * @return bool
2011          */
2012         function exists() {
2013                 return $this->getArticleId() != 0;
2014         }
2015
2016         /**
2017          * Should a link should be displayed as a known link, just based on its title?
2018          *
2019          * Currently, a self-link with a fragment and special pages are in
2020          * this category. Special pages never exist in the database.
2021          */
2022         function isAlwaysKnown() {
2023                 return  $this->isExternal() || ( 0 == $this->mNamespace && "" == $this->mDbkeyform )
2024                   || NS_SPECIAL == $this->mNamespace;
2025         }
2026
2027         /**
2028          * Update page_touched timestamps on pages linking to this title.
2029          * In principal, this could be backgrounded and could also do squid
2030          * purging.
2031          */
2032         function touchLinks() {
2033                 $fname = 'Title::touchLinks';
2034
2035                 $dbw =& wfGetDB( DB_MASTER );
2036
2037                 $res = $dbw->select( 'pagelinks',
2038                         array( 'pl_from' ),
2039                         array(
2040                                 'pl_namespace' => $this->getNamespace(),
2041                                 'pl_title'     => $this->getDbKey() ),
2042                         $fname );
2043
2044                 $toucharr = array();
2045                 while( $row = $dbw->fetchObject( $res ) ) {
2046                         $toucharr[] = $row->pl_from;
2047                 }
2048                 $dbw->freeResult( $res );
2049
2050                 if( $this->getNamespace() == NS_CATEGORY ) {
2051                         // Categories show up in a separate set of links as well
2052                         $res = $dbw->select( 'categorylinks',
2053                                 array( 'cl_from' ),
2054                                 array( 'cl_to' => $this->getDbKey() ),
2055                                 $fname );
2056                         while( $row = $dbw->fetchObject( $res ) ) {
2057                                 $toucharr[] = $row->cl_from;
2058                         }
2059                         $dbw->freeResult( $res );
2060                 }
2061
2062                 if (!count($toucharr))
2063                         return;
2064                 $dbw->update( 'page', /* SET */ array( 'page_touched' => $dbw->timestamp() ),
2065                                                         /* WHERE */ array( 'page_id' => $toucharr ),$fname);
2066         }
2067
2068         function trackbackURL() {
2069                 global $wgTitle, $wgScriptPath, $wgServer;
2070
2071                 return "$wgServer$wgScriptPath/trackback.php?article="
2072                         . htmlspecialchars(urlencode($wgTitle->getPrefixedDBkey()));
2073         }
2074
2075         function trackbackRDF() {
2076                 $url = htmlspecialchars($this->getFullURL());
2077                 $title = htmlspecialchars($this->getText());
2078                 $tburl = $this->trackbackURL();
2079
2080                 return "
2081 <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"
2082          xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
2083          xmlns:trackback=\"http://madskills.com/public/xml/rss/module/trackback/\">
2084 <rdf:Description
2085    rdf:about=\"$url\"
2086    dc:identifier=\"$url\"
2087    dc:title=\"$title\"
2088    trackback:ping=\"$tburl\" />
2089 </rdf:RDF>";
2090         }
2091 }
2092 ?>