includes/RecentChange.php

   1 <?php
   2 /**
   3  *
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  * Utility class for creating new RC entries
   9  * mAttribs:
  10  *      rc_id           id of the row in the recentchanges table
  11  *      rc_timestamp    time the entry was made
  12  *      rc_cur_time     timestamp on the cur row
  13  *      rc_namespace    namespace #
  14  *      rc_title        non-prefixed db key
  15  *      rc_type         is new entry, used to determine whether updating is necessary
  16  *      rc_minor        is minor
  17  *      rc_cur_id       page_id of associated page entry
  18  *      rc_user         user id who made the entry
  19  *      rc_user_text    user name who made the entry
  20  *      rc_comment      edit summary
  21  *      rc_this_oldid   rev_id associated with this entry (or zero)
  22  *      rc_last_oldid   rev_id associated with the entry before this one (or zero)
  23  *      rc_bot          is bot, hidden
  24  *      rc_ip           IP address of the user in dotted quad notation
  25  *      rc_new          obsolete, use rc_type==RC_NEW
  26  *      rc_patrolled    boolean whether or not someone has marked this edit as patrolled
  27  *      rc_old_len      integer byte length of the text before the edit
  28  *      rc_new_len      the same after the edit
  29  *
  30  * mExtra:
  31  *      prefixedDBkey   prefixed db key, used by external app via msg queue
  32  *      lastTimestamp   timestamp of previous entry, used in WHERE clause during update
  33  *      lang            the interwiki prefix, automatically set in save()
  34  *  oldSize         text size before the change
  35  *  newSize         text size after the change
  36  *
  37  * temporary:           not stored in the database
  38  *      notificationtimestamp
  39  *      numberofWatchingusers
  40  *
  41  * @todo document functions and variables
  42  * @package MediaWiki
  43  */
  44 class RecentChange
  45 {
  46         var $mAttribs = array(), $mExtra = array();
  47         var $mTitle = false, $mMovedToTitle = false;
  48         var $numberofWatchingusers = 0 ; # Dummy to prevent error message in SpecialRecentchangeslinked
  49
  50         # Factory methods
  51
  52         /* static */ function newFromRow( $row )
  53         {
  54                 $rc = new RecentChange;
  55                 $rc->loadFromRow( $row );
  56                 return $rc;
  57         }
  58
  59         public static function newFromCurRow( $row, $rc_this_oldid = 0 )
  60         {
  61                 $rc = new RecentChange;
  62                 $rc->loadFromCurRow( $row, $rc_this_oldid );
  63                 $rc->notificationtimestamp = false;
  64                 $rc->numberofWatchingusers = false;
  65                 return $rc;
  66         }
  67
  68         /**
  69          * Obtain the recent change with a given rc_id value
  70          *
  71          * @param $rcid rc_id value to retrieve
  72          * @return RecentChange
  73          */
  74         public static function newFromId( $rcid ) {
  75                 $dbr =& wfGetDB( DB_SLAVE );
  76                 $res = $dbr->select( 'recentchanges', '*', array( 'rc_id' => $rcid ), __METHOD__ );
  77                 if( $res && $dbr->numRows( $res ) > 0 ) {
  78                         $row = $dbr->fetchObject( $res );
  79                         $dbr->freeResult( $res );
  80                         return self::newFromRow( $row );
  81                 } else {
  82                         return NULL;
  83                 }
  84         }
  85
  86         # Accessors
  87
  88         function setAttribs( $attribs )
  89         {
  90                 $this->mAttribs = $attribs;
  91         }
  92
  93         function setExtra( $extra )
  94         {
  95                 $this->mExtra = $extra;
  96         }
  97
  98         function &getTitle()
  99         {
 100                 if ( $this->mTitle === false ) {
 101                         $this->mTitle = Title::makeTitle( $this->mAttribs['rc_namespace'], $this->mAttribs['rc_title'] );
 102                 }
 103                 return $this->mTitle;
 104         }
 105
 106         function getMovedToTitle()
 107         {
 108                 if ( $this->mMovedToTitle === false ) {
 109                         $this->mMovedToTitle = Title::makeTitle( $this->mAttribs['rc_moved_to_ns'],
 110                                 $this->mAttribs['rc_moved_to_title'] );
 111                 }
 112                 return $this->mMovedToTitle;
 113         }
 114
 115         # Writes the data in this object to the database
 116         function save()
 117         {
 118                 global $wgLocalInterwiki, $wgPutIPinRC, $wgRC2UDPAddress, $wgRC2UDPPort, $wgRC2UDPPrefix;
 119                 $fname = 'RecentChange::save';
 120
 121                 $dbw =& wfGetDB( DB_MASTER );
 122                 if ( !is_array($this->mExtra) ) {
 123                         $this->mExtra = array();
 124                 }
 125                 $this->mExtra['lang'] = $wgLocalInterwiki;
 126
 127                 if ( !$wgPutIPinRC ) {
 128                         $this->mAttribs['rc_ip'] = '';
 129                 }
 130
 131                 ## If our database is strict about IP addresses, use NULL instead of an empty string
 132                 if ( $dbw->strictIPs() and $this->mAttribs['rc_ip'] == '' ) {
 133                         unset( $this->mAttribs['rc_ip'] );
 134                 }
 135
 136                 # Fixup database timestamps
 137                 $this->mAttribs['rc_timestamp'] = $dbw->timestamp($this->mAttribs['rc_timestamp']);
 138                 $this->mAttribs['rc_cur_time'] = $dbw->timestamp($this->mAttribs['rc_cur_time']);
 139                 $this->mAttribs['rc_id'] = $dbw->nextSequenceValue( 'rc_rc_id_seq' );
 140
 141                 ## If we are using foreign keys, an entry of 0 for the page_id will fail, so use NULL
 142                 if ( $dbw->cascadingDeletes() and $this->mAttribs['rc_cur_id']==0 ) {
 143                         unset ( $this->mAttribs['rc_cur_id'] );
 144                 }
 145
 146                 # Insert new row
 147                 $dbw->insert( 'recentchanges', $this->mAttribs, $fname );
 148
 149                 # Set the ID
 150                 $this->mAttribs['rc_id'] = $dbw->insertId();
 151
 152                 # Update old rows, if necessary
 153                 if ( $this->mAttribs['rc_type'] == RC_EDIT ) {
 154                         $lastTime = $this->mExtra['lastTimestamp'];
 155                         #$now = $this->mAttribs['rc_timestamp'];
 156                         #$curId = $this->mAttribs['rc_cur_id'];
 157
 158                         # Don't bother looking for entries that have probably
 159                         # been purged, it just locks up the indexes needlessly.
 160                         global $wgRCMaxAge;
 161                         $age = time() - wfTimestamp( TS_UNIX, $lastTime );
 162                         if( $age < $wgRCMaxAge ) {
 163                                 # live hack, will commit once tested - kate
 164                                 # Update rc_this_oldid for the entries which were current
 165                                 #
 166                                 #$oldid = $this->mAttribs['rc_last_oldid'];
 167                                 #$ns = $this->mAttribs['rc_namespace'];
 168                                 #$title = $this->mAttribs['rc_title'];
 169                                 #
 170                                 #$dbw->update( 'recentchanges',
 171                                 #       array( /* SET */
 172                                 #               'rc_this_oldid' => $oldid
 173                                 #       ), array( /* WHERE */
 174                                 #               'rc_namespace' => $ns,
 175                                 #               'rc_title' => $title,
 176                                 #               'rc_timestamp' => $dbw->timestamp( $lastTime )
 177                                 #       ), $fname
 178                                 #);
 179                         }
 180
 181                         # Update rc_cur_time
 182                         #$dbw->update( 'recentchanges', array( 'rc_cur_time' => $now ),
 183                         #       array( 'rc_cur_id' => $curId ), $fname );
 184                 }
 185
 186                 # Notify external application via UDP
 187                 if ( $wgRC2UDPAddress ) {
 188                         $conn = socket_create( AF_INET, SOCK_DGRAM, SOL_UDP );
 189                         if ( $conn ) {
 190                                 $line = $wgRC2UDPPrefix . $this->getIRCLine();
 191                                 socket_sendto( $conn, $line, strlen($line), 0, $wgRC2UDPAddress, $wgRC2UDPPort );
 192                                 socket_close( $conn );
 193                         }
 194                 }
 195
 196                 # E-mail notifications
 197                 global $wgUseEnotif;
 198                 if( $wgUseEnotif ) {
 199                         # this would be better as an extension hook
 200                         include_once( "UserMailer.php" );
 201                         $enotif = new EmailNotification();
 202                         $title = Title::makeTitle( $this->mAttribs['rc_namespace'], $this->mAttribs['rc_title'] );
 203                         $enotif->notifyOnPageChange( $title,
 204                                 $this->mAttribs['rc_timestamp'],
 205                                 $this->mAttribs['rc_comment'],
 206                                 $this->mAttribs['rc_minor'],
 207                                 $this->mAttribs['rc_last_oldid'] );
 208                 }
 209
 210                 # Notify extensions
 211                 wfRunHooks( 'RecentChange_save', array( &$this ) );
 212         }
 213
 214         # Marks a certain row as patrolled
 215         function markPatrolled( $rcid )
 216         {
 217                 $fname = 'RecentChange::markPatrolled';
 218
 219                 $dbw =& wfGetDB( DB_MASTER );
 220
 221                 $dbw->update( 'recentchanges',
 222                         array( /* SET */
 223                                 'rc_patrolled' => 1
 224                         ), array( /* WHERE */
 225                                 'rc_id' => $rcid
 226                         ), $fname
 227                 );
 228         }
 229
 230         # Makes an entry in the database corresponding to an edit
 231         /*static*/ function notifyEdit( $timestamp, &$title, $minor, &$user, $comment,
 232                 $oldId, $lastTimestamp, $bot = "default", $ip = '', $oldSize = 0, $newSize = 0,
 233                 $newId = 0)
 234         {
 235
 236                 if ( $bot === 'default' ) {
 237                         $bot = $user->isAllowed( 'bot' );
 238                 }
 239
 240                 if ( !$ip ) {
 241                         $ip = wfGetIP();
 242                         if ( !$ip ) {
 243                                 $ip = '';
 244                         }
 245                 }
 246
 247                 $rc = new RecentChange;
 248                 $rc->mAttribs = array(
 249                         'rc_timestamp'  => $timestamp,
 250                         'rc_cur_time'   => $timestamp,
 251                         'rc_namespace'  => $title->getNamespace(),
 252                         'rc_title'      => $title->getDBkey(),
 253                         'rc_type'       => RC_EDIT,
 254                         'rc_minor'      => $minor ? 1 : 0,
 255                         'rc_cur_id'     => $title->getArticleID(),
 256                         'rc_user'       => $user->getID(),
 257                         'rc_user_text'  => $user->getName(),
 258                         'rc_comment'    => $comment,
 259                         'rc_this_oldid' => $newId,
 260                         'rc_last_oldid' => $oldId,
 261                         'rc_bot'        => $bot ? 1 : 0,
 262                         'rc_moved_to_ns'        => 0,
 263                         'rc_moved_to_title'     => '',
 264                         'rc_ip'         => $ip,
 265                         'rc_patrolled'  => 0,
 266                         'rc_new'        => 0,  # obsolete
 267                         'rc_old_len'    => $oldSize,
 268                         'rc_new_len'    => $newSize
 269                 );
 270
 271                 $rc->mExtra =  array(
 272                         'prefixedDBkey' => $title->getPrefixedDBkey(),
 273                         'lastTimestamp' => $lastTimestamp,
 274                         'oldSize'       => $oldSize,
 275                         'newSize'       => $newSize,
 276                 );
 277                 $rc->save();
 278                 return( $rc->mAttribs['rc_id'] );
 279         }
 280
 281         /**
 282          * Makes an entry in the database corresponding to page creation
 283          * Note: the title object must be loaded with the new id using resetArticleID()
 284          * @todo Document parameters and return
 285          * @public
 286          * @static
 287          */
 288         public static function notifyNew( $timestamp, &$title, $minor, &$user, $comment, $bot = "default",
 289           $ip='', $size = 0, $newId = 0 )
 290         {
 291                 if ( !$ip ) {
 292                         $ip = wfGetIP();
 293                         if ( !$ip ) {
 294                                 $ip = '';
 295                         }
 296                 }
 297                 if ( $bot == 'default' ) {
 298                         $bot = $user->isAllowed( 'bot' );
 299                 }
 300
 301                 $rc = new RecentChange;
 302                 $rc->mAttribs = array(
 303                         'rc_timestamp'      => $timestamp,
 304                         'rc_cur_time'       => $timestamp,
 305                         'rc_namespace'      => $title->getNamespace(),
 306                         'rc_title'          => $title->getDBkey(),
 307                         'rc_type'           => RC_NEW,
 308                         'rc_minor'          => $minor ? 1 : 0,
 309                         'rc_cur_id'         => $title->getArticleID(),
 310                         'rc_user'           => $user->getID(),
 311                         'rc_user_text'      => $user->getName(),
 312                         'rc_comment'        => $comment,
 313                         'rc_this_oldid'     => $newId,
 314                         'rc_last_oldid'     => 0,
 315                         'rc_bot'            => $bot ? 1 : 0,
 316                         'rc_moved_to_ns'    => 0,
 317                         'rc_moved_to_title' => '',
 318                         'rc_ip'             => $ip,
 319                         'rc_patrolled'      => 0,
 320                         'rc_new'            => 1, # obsolete
 321                         'rc_old_len'        => 0,
 322                         'rc_new_len'        => $size
 323                 );
 324
 325                 $rc->mExtra =  array(
 326                         'prefixedDBkey' => $title->getPrefixedDBkey(),
 327                         'lastTimestamp' => 0,
 328                         'oldSize' => 0,
 329                         'newSize' => $size
 330                 );
 331                 $rc->save();
 332                 return( $rc->mAttribs['rc_id'] );
 333         }
 334
 335         # Makes an entry in the database corresponding to a rename
 336         /*static*/ function notifyMove( $timestamp, &$oldTitle, &$newTitle, &$user, $comment, $ip='', $overRedir = false )
 337         {
 338                 if ( !$ip ) {
 339                         $ip = wfGetIP();
 340                         if ( !$ip ) {
 341                                 $ip = '';
 342                         }
 343                 }
 344
 345                 $rc = new RecentChange;
 346                 $rc->mAttribs = array(
 347                         'rc_timestamp'  => $timestamp,
 348                         'rc_cur_time'   => $timestamp,
 349                         'rc_namespace'  => $oldTitle->getNamespace(),
 350                         'rc_title'      => $oldTitle->getDBkey(),
 351                         'rc_type'       => $overRedir ? RC_MOVE_OVER_REDIRECT : RC_MOVE,
 352                         'rc_minor'      => 0,
 353                         'rc_cur_id'     => $oldTitle->getArticleID(),
 354                         'rc_user'       => $user->getID(),
 355                         'rc_user_text'  => $user->getName(),
 356                         'rc_comment'    => $comment,
 357                         'rc_this_oldid' => 0,
 358                         'rc_last_oldid' => 0,
 359                         'rc_bot'        => $user->isAllowed( 'bot' ) ? 1 : 0,
 360                         'rc_moved_to_ns'        => $newTitle->getNamespace(),
 361                         'rc_moved_to_title'     => $newTitle->getDBkey(),
 362                         'rc_ip'         => $ip,
 363                         'rc_new'        => 0, # obsolete
 364                         'rc_patrolled'  => 1,
 365                         'rc_old_len'    => NULL,
 366                         'rc_new_len'    => NULL,
 367                 );
 368
 369                 $rc->mExtra = array(
 370                         'prefixedDBkey' => $oldTitle->getPrefixedDBkey(),
 371                         'lastTimestamp' => 0,
 372                         'prefixedMoveTo'        => $newTitle->getPrefixedDBkey()
 373                 );
 374                 $rc->save();
 375         }
 376
 377         /* static */ function notifyMoveToNew( $timestamp, &$oldTitle, &$newTitle, &$user, $comment, $ip='' ) {
 378                 RecentChange::notifyMove( $timestamp, $oldTitle, $newTitle, $user, $comment, $ip, false );
 379         }
 380
 381         /* static */ function notifyMoveOverRedirect( $timestamp, &$oldTitle, &$newTitle, &$user, $comment, $ip='' ) {
 382                 RecentChange::notifyMove( $timestamp, $oldTitle, $newTitle, $user, $comment, $ip, true );
 383         }
 384
 385         # A log entry is different to an edit in that previous revisions are
 386         # not kept
 387         /*static*/ function notifyLog( $timestamp, &$title, &$user, $comment, $ip='',
 388            $type, $action, $target, $logComment, $params )
 389         {
 390                 if ( !$ip ) {
 391                         $ip = wfGetIP();
 392                         if ( !$ip ) {
 393                                 $ip = '';
 394                         }
 395                 }
 396
 397                 $rc = new RecentChange;
 398                 $rc->mAttribs = array(
 399                         'rc_timestamp'  => $timestamp,
 400                         'rc_cur_time'   => $timestamp,
 401                         'rc_namespace'  => $title->getNamespace(),
 402                         'rc_title'      => $title->getDBkey(),
 403                         'rc_type'       => RC_LOG,
 404                         'rc_minor'      => 0,
 405                         'rc_cur_id'     => $title->getArticleID(),
 406                         'rc_user'       => $user->getID(),
 407                         'rc_user_text'  => $user->getName(),
 408                         'rc_comment'    => $comment,
 409                         'rc_this_oldid' => 0,
 410                         'rc_last_oldid' => 0,
 411                         'rc_bot'        => $user->isAllowed( 'bot' ) ? 1 : 0,
 412                         'rc_moved_to_ns'        => 0,
 413                         'rc_moved_to_title'     => '',
 414                         'rc_ip' => $ip,
 415                         'rc_patrolled' => 1,
 416                         'rc_new'        => 0, # obsolete
 417                         'rc_old_len'    => NULL,
 418                         'rc_new_len'    => NULL,
 419                 );
 420                 $rc->mExtra =  array(
 421                         'prefixedDBkey' => $title->getPrefixedDBkey(),
 422                         'lastTimestamp' => 0,
 423                         'logType' => $type,
 424                         'logAction' => $action,
 425                         'logComment' => $logComment,
 426                         'logTarget' => $target,
 427                         'logParams' => $params
 428                 );
 429                 $rc->save();
 430         }
 431
 432         # Initialises the members of this object from a mysql row object
 433         function loadFromRow( $row )
 434         {
 435                 $this->mAttribs = get_object_vars( $row );
 436                 $this->mAttribs["rc_timestamp"] = wfTimestamp(TS_MW, $this->mAttribs["rc_timestamp"]);
 437                 $this->mExtra = array();
 438         }
 439
 440         # Makes a pseudo-RC entry from a cur row
 441         function loadFromCurRow( $row )
 442         {
 443                 $this->mAttribs = array(
 444                         'rc_timestamp' => wfTimestamp(TS_MW, $row->rev_timestamp),
 445                         'rc_cur_time' => $row->rev_timestamp,
 446                         'rc_user' => $row->rev_user,
 447                         'rc_user_text' => $row->rev_user_text,
 448                         'rc_namespace' => $row->page_namespace,
 449                         'rc_title' => $row->page_title,
 450                         'rc_comment' => $row->rev_comment,
 451                         'rc_minor' => $row->rev_minor_edit ? 1 : 0,
 452                         'rc_type' => $row->page_is_new ? RC_NEW : RC_EDIT,
 453                         'rc_cur_id' => $row->page_id,
 454                         'rc_this_oldid' => $row->rev_id,
 455                         'rc_last_oldid' => isset($row->rc_last_oldid) ? $row->rc_last_oldid : 0,
 456                         'rc_bot'        => 0,
 457                         'rc_moved_to_ns'        => 0,
 458                         'rc_moved_to_title'     => '',
 459                         'rc_ip' => '',
 460                         'rc_id' => $row->rc_id,
 461                         'rc_patrolled' => $row->rc_patrolled,
 462                         'rc_new' => $row->page_is_new, # obsolete
 463                         'rc_old_len' => $row->rc_old_len,
 464                         'rc_new_len' => $row->rc_new_len,
 465                 );
 466
 467                 $this->mExtra = array();
 468         }
 469
 470         /**
 471          * Get an attribute value
 472          *
 473          * @param $name Attribute name
 474          * @return mixed
 475          */
 476         public function getAttribute( $name ) {
 477                 return isset( $this->mAttribs[$name] ) ? $this->mAttribs[$name] : NULL;
 478         }
 479
 480         /**
 481          * Gets the end part of the diff URL associated with this object
 482          * Blank if no diff link should be displayed
 483          */
 484         function diffLinkTrail( $forceCur )
 485         {
 486                 if ( $this->mAttribs['rc_type'] == RC_EDIT ) {
 487                         $trail = "curid=" . (int)($this->mAttribs['rc_cur_id']) .
 488                                 "&oldid=" . (int)($this->mAttribs['rc_last_oldid']);
 489                         if ( $forceCur ) {
 490                                 $trail .= '&diff=0' ;
 491                         } else {
 492                                 $trail .= '&diff=' . (int)($this->mAttribs['rc_this_oldid']);
 493                         }
 494                 } else {
 495                         $trail = '';
 496                 }
 497                 return $trail;
 498         }
 499
 500         function cleanupForIRC( $text ) {
 501                 return str_replace(array("\n", "\r"), array("", ""), $text);
 502         }
 503
 504         function getIRCLine() {
 505                 global $wgUseRCPatrol;
 506
 507                 extract($this->mAttribs);
 508                 extract($this->mExtra);
 509
 510                 $titleObj =& $this->getTitle();
 511                 if ( $rc_type == RC_LOG ) {
 512                         $title = Namespace::getCanonicalName( $titleObj->getNamespace() ) . $titleObj->getText();
 513                 } else {
 514                         $title = $titleObj->getPrefixedText();
 515                 }
 516                 $title = $this->cleanupForIRC( $title );
 517
 518                 $bad = array("\n", "\r");
 519                 $empty = array("", "");
 520                 $title = $titleObj->getPrefixedText();
 521                 $title = str_replace($bad, $empty, $title);
 522
 523                 // FIXME: *HACK* these should be getFullURL(), hacked for SSL madness --brion 2005-12-26
 524                 if ( $rc_type == RC_LOG ) {
 525                         $url = '';
 526                 } elseif ( $rc_new && $wgUseRCPatrol ) {
 527                         $url = $titleObj->getInternalURL("rcid=$rc_id");
 528                 } else if ( $rc_new ) {
 529                         $url = $titleObj->getInternalURL();
 530                 } else if ( $wgUseRCPatrol ) {
 531                         $url = $titleObj->getInternalURL("diff=$rc_this_oldid&oldid=$rc_last_oldid&rcid=$rc_id");
 532                 } else {
 533                         $url = $titleObj->getInternalURL("diff=$rc_this_oldid&oldid=$rc_last_oldid");
 534                 }
 535
 536                 if ( isset( $oldSize ) && isset( $newSize ) ) {
 537                         $szdiff = $newSize - $oldSize;
 538                         if ($szdiff < -500) {
 539                                 $szdiff = "\002$szdiff\002";
 540                         } elseif ($szdiff >= 0) {
 541                                 $szdiff = '+' . $szdiff ;
 542                         }
 543                         $szdiff = '(' . $szdiff . ')' ;
 544                 } else {
 545                         $szdiff = '';
 546                 }
 547
 548                 $user = $this->cleanupForIRC( $rc_user_text );
 549
 550                 if ( $rc_type == RC_LOG ) {
 551                         $logTargetText = $logTarget->getPrefixedText();
 552                         $comment = $this->cleanupForIRC( str_replace( $logTargetText, "\00302$logTargetText\00310", $rc_comment ) );
 553                         $flag = $logAction;
 554                 } else {
 555                         $comment = $this->cleanupForIRC( $rc_comment );
 556                         $flag = ($rc_minor ? "M" : "") . ($rc_new ? "N" : "");
 557                 }
 558                 # see http://www.irssi.org/documentation/formats for some colour codes. prefix is \003,
 559                 # no colour (\003) switches back to the term default
 560                 $fullString = "\00314[[\00307$title\00314]]\0034 $flag\00310 " .
 561                               "\00302$url\003 \0035*\003 \00303$user\003 \0035*\003 $szdiff \00310$comment\003\n";
 562                 return $fullString;
 563         }
 564
 565         /**
 566          * Returns the change size (HTML).
 567          * The lengths can be given optionally.
 568          */
 569         function getCharacterDifference( $old = 0, $new = 0 ) {
 570                 global $wgRCChangedSizeThreshold, $wgLang;
 571
 572                 if( $old === 0 ) {
 573                         $old = $this->mAttribs['rc_old_len'];
 574                 }
 575                 if( $new === 0 ) {
 576                         $new = $this->mAttribs['rc_new_len'];
 577                 }
 578
 579                 if( $old === NULL || $new === NULL ) {
 580                         return '';
 581                 }
 582
 583                 $szdiff = $new - $old;
 584
 585                 if( $szdiff < $wgRCChangedSizeThreshold ) {
 586                         return '<strong class=\'mw-plusminus-neg\'>(' . $wgLang->formatNum( $szdiff ) . ')</strong>';
 587                 } elseif( $szdiff === 0 ) {
 588                         return '<span class=\'mw-plusminus-null\'>(' . $wgLang->formatNum( $szdiff ) . ')</span>';
 589                 } elseif( $szdiff > 0 ) {
 590                         return '<span class=\'mw-plusminus-pos\'>(+' . $wgLang->formatNum( $szdiff ) . ')</span>';
 591                 } else {
 592                         return '<span class=\'mw-plusminus-neg\'>(' . $wgLang->formatNum( $szdiff ) . ')</span>';
 593                 }
 594         }
 595 }
 596 ?>