SpecialDeadendPages.php

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<?php
use MediaWiki\MediaWikiServices;

class SpecialDeadendPages extends PageQueryPage {

    function __construct( $name = 'Deadendpages' ) {
        parent::__construct( $name );
    }

    function getPageHeader() {
        return $this->msg( 'deadendpagestext' )->parseAsBlock();
    }

    function isExpensive() {
        return true;
    }

    function isSyndicated() {
        return false;
    }

    function sortDescending() {
        return false;
    }

    function getQueryInfo() {
        return [
            'tables' => [ 'page', 'pagelinks' ],
            'fields' => [
                'namespace' => 'page_namespace',
                'title' => 'page_title',
                'value' => 'page_title'
            ],
            'conds' => [
                'pl_from IS NULL',
                'page_namespace' => MediaWikiServices::getInstance()->getNamespaceInfo()->
                    getContentNamespaces(),
                'page_is_redirect' => 0
            ],
            'join_conds' => [
                'pagelinks' => [
                    'LEFT JOIN',
                    [ 'page_id=pl_from' ]
                ]
            ]
        ];
    }

    function getOrderFields() {
        // For some crazy reason ordering by a constant
        // causes a filesort
        if ( count( MediaWikiServices::getInstance()->getNamespaceInfo()->
            getContentNamespaces() ) > 1
        ) {
            return [ 'page_namespace', 'page_title' ];
        } else {
            return [ 'page_title' ];
        }
    }

    protected function getGroupName() {
        return 'maintenance';
    }
}