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<?php /** * WPSEO plugin file. * * @package WPSEO\Frontend */ /** * Class WPSEO_Handle_404 * * Handles intercepting requests. * * @since 9.4 */ class WPSEO_Handle_404 implements WPSEO_WordPress_Integration { /** * Registers all hooks to WordPress. * * @return void */ public function register_hooks() { add_filter( 'pre_handle_404', [ $this, 'handle_404' ] ); } /** * Handle the 404 status code. * * @param bool $handled Whether we've handled the request. * * @return bool True if it's 404. */ public function handle_404( $handled ) { if ( is_feed() ) { return $this->is_feed_404( $handled ); } return $handled; } /** * If there are no posts in a feed, make it 404 instead of sending an empty RSS feed. * * @global WP_Query $wp_query * * @param bool $handled Whether we've handled the request. * * @return bool True if it's 404. */ protected function is_feed_404( $handled ) { global $wp_query; // Don't 404 if the query contains post(s) or an object. if ( $wp_query->posts || $wp_query->get_queried_object() ) { return $handled; } // Don't 404 if it isn't archive or singular. if ( ! $wp_query->is_archive() && ! $wp_query->is_singular() ) { return $handled; } $wp_query->is_feed = false; $this->set_404(); add_filter( 'old_slug_redirect_url', '__return_false' ); add_filter( 'redirect_canonical', '__return_false' ); return true; } /** * Sets the 404 status code. * * @global WP_Query $wp_query * * @return void */ private function set_404() { global $wp_query; // Overwrite Content-Type header. if ( ! headers_sent() ) { header( 'Content-Type: ' . get_option( 'html_type' ) . '; charset=' . get_option( 'blog_charset' ) ); } $wp_query->set_404(); status_header( 404 ); nocache_headers(); } }