SpecialPopularpages.php

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<?php
class PopularPagesPage extends QueryPage {

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

        function isExpensive() {
                # page_counter is not indexed
                return true;
        }

        function isSyndicated() {
                return false;
        }

        function getQueryInfo() {
                return array (
                        'tables' => array( 'page' ),
                        'fields' => array( 'namespace' => 'page_namespace',
                                        'title' => 'page_title',
                                        'value' => 'page_counter' ),
                        'conds' => array( 'page_is_redirect' => 0,
                                        'page_namespace' => MWNamespace::getContentNamespaces() ) );
        }

        function formatResult( $skin, $result ) {
                global $wgContLang;

                $title = Title::makeTitleSafe( $result->namespace, $result->title );
                if( !$title ) {
                        return Html::element( 'span', array( 'class' => 'mw-invalidtitle' ),
                                Linker::getInvalidTitleDescription( $this->getContext(), $result->namespace, $result->title ) );
                }

                $link = Linker::linkKnown(
                        $title,
                        htmlspecialchars( $wgContLang->convert( $title->getPrefixedText() ) )
                );
                $nv = $this->msg( 'nviews' )->numParams( $result->value )->escaped();
                return $this->getLanguage()->specialList( $link, $nv );
        }

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