deleteOrphanedRevisions.php

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<?php
require_once( __DIR__ . '/Maintenance.php' );

class DeleteOrphanedRevisions extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->mDescription = "Maintenance script to delete revisions which refer to a nonexisting page";
                $this->addOption( 'report', 'Prints out a count of affected revisions but doesn\'t delete them' );
        }

        public function execute() {
                $this->output( "Delete Orphaned Revisions\n" );

                $report = $this->hasOption( 'report' );

                $dbw = wfGetDB( DB_MASTER );
                $dbw->begin( __METHOD__ );
                list( $page, $revision ) = $dbw->tableNamesN( 'page', 'revision' );

                # Find all the orphaned revisions
                $this->output( "Checking for orphaned revisions..." );
                $sql = "SELECT rev_id FROM {$revision} LEFT JOIN {$page} ON rev_page = page_id WHERE page_namespace IS NULL";
                $res = $dbw->query( $sql, 'deleteOrphanedRevisions' );

                # Stash 'em all up for deletion (if needed)
                $revisions = array();
                foreach ( $res as $row )
                        $revisions[] = $row->rev_id;
                $count = count( $revisions );
                $this->output( "found {$count}.\n" );

                # Nothing to do?
                if ( $report || $count == 0 ) {
                        $dbw->commit( __METHOD__ );
                        exit( 0 );
                }

                # Delete each revision
                $this->output( "Deleting..." );
                $this->deleteRevs( $revisions, $dbw );
                $this->output( "done.\n" );

                # Close the transaction and call the script to purge unused text records
                $dbw->commit( __METHOD__ );
                $this->purgeRedundantText( true );
        }

        private function deleteRevs( $id, &$dbw ) {
                if ( !is_array( $id ) )
                        $id = array( $id );
                $dbw->delete( 'revision', array( 'rev_id' => $id ), __METHOD__ );
        }
}

$maintClass = "DeleteOrphanedRevisions";
require_once( RUN_MAINTENANCE_IF_MAIN );