checkBadRedirects.php

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<?php
use MediaWiki\Revision\SlotRecord;
use MediaWiki\Title\Title;
 
require_once __DIR__ . '/Maintenance.php';
 
class CheckBadRedirects extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Check for bad redirects' );
    }
 
    public function execute() {
        $this->output( "Fetching redirects...\n" );
        $dbr = $this->getDB( DB_REPLICA );
        $result = $dbr->newSelectQueryBuilder()
            ->select( [ 'page_namespace', 'page_title', 'page_latest' ] )
            ->from( 'page' )
            ->where( [ 'page_is_redirect' => 1 ] )
            ->caller( __METHOD__ )
            ->fetchResultSet();
 
        $count = $result->numRows();
        $this->output( "Found $count redirects.\n" .
            "Checking for bad redirects:\n\n" );
 
        $revLookup = $this->getServiceContainer()->getRevisionLookup();
        foreach ( $result as $row ) {
            $title = Title::makeTitle( $row->page_namespace, $row->page_title );
            $revRecord = $revLookup->getRevisionById( $row->page_latest );
            if ( $revRecord ) {
                $target = $revRecord->getContent( SlotRecord::MAIN )->getRedirectTarget();
                if ( !$target ) {
                    $this->output( $title->getPrefixedText() . "\n" );
                }
            }
        }
        $this->output( "\nDone.\n" );
    }
}
 
$maintClass = CheckBadRedirects::class;
require_once RUN_MAINTENANCE_IF_MAIN;