SpecialUnusedcategories.php

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<?php
class UnusedCategoriesPage extends QueryPage {
    function __construct( $name = 'Unusedcategories' ) {
        parent::__construct( $name );
    }
 
    public function isExpensive() {
        return true;
    }
 
    function getPageHeader() {
        return $this->msg( 'unusedcategoriestext' )->parseAsBlock();
    }
 
    function getOrderFields() {
        return [ 'title' ];
    }
 
    public function getQueryInfo() {
        return [
            'tables' => [ 'page', 'categorylinks' ],
            'fields' => [
                'namespace' => 'page_namespace',
                'title' => 'page_title',
            ],
            'conds' => [
                'cl_from IS NULL',
                'page_namespace' => NS_CATEGORY,
                'page_is_redirect' => 0
            ],
            'join_conds' => [ 'categorylinks' => [ 'LEFT JOIN', 'cl_to = page_title' ] ]
        ];
    }
 
    function sortDescending() {
        return false;
    }
 
    function formatResult( $skin, $result ) {
        $title = Title::makeTitle( NS_CATEGORY, $result->title );
 
        return $this->getLinkRenderer()->makeLink( $title, $title->getText() );
    }
 
    protected function getGroupName() {
        return 'maintenance';
    }
 
    public function preprocessResults( $db, $res ) {
        $this->executeLBFromResultWrapper( $res );
    }
}