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<?php /** * Enable using a custom page as 404 page * * @package Themify_Builder * @subpackage Themify_Builder/classes */ class Themify_Custom_404 { public static function init() { if ( is_404() && self::get_page() ) { /* do redirect_canonical early, handles all redirects needed for WP before changing the query */ redirect_canonical(); remove_filter( 'template_redirect', 'redirect_canonical' ); /* replace the 404 query with a custom WP_Query that displays the chosen page */ global $wp_query, $wp_the_query; $wp_query = $wp_the_query = self::get_404_query(); $posts = $wp_query->posts; $wp_query->rewind_posts(); global $themify; $themify->is_custom_404 = true; self::set_headers(); add_filter( 'body_class', [ __CLASS__, 'body_class' ] ); } } /** * Get the 404 page * * @return WP_Post|false */ public static function get_page() { static $id = null; if ( $id === null ) { $id = (int) themify_get( 'setting-page_404', false, true ); if ( $id !== 0 ) { $id = themify_maybe_translate_object_id( $id ); $id = ! empty( $id ) ? get_post( $id ) : false; } } return $id; } private static function get_404_query() { $query = new WP_Query(); $query->query( array( 'page_id' => self::get_page()->ID, 'suppress_filters' => true, ) ); $query->the_post(); return $query; } private static function set_headers() { status_header( 404 ); nocache_headers(); } public static function body_class( $classes ) { $classes[] = 'error404'; return $classes; } /** * Helper function, returns true only if is_404 and is using custom page * * @return bool */ public static function is_custom_404() { global $themify; return isset( $themify->is_custom_404 ) && $themify->is_custom_404 === true; } } add_action( 'template_redirect', [ 'Themify_Custom_404', 'init' ], 0 );
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