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;