wp_dashboard_cached_rss_widget( string $widget_id, callable $callback, array $check_urls = array(), mixed $args ): bool

1166function wp_dashboard_cached_rss_widget( $widget_id, $callback, $check_urls = array(), ...$args ) {1167	$doing_ajax = wp_doing_ajax();1168	$loading    = '<p class="widget-loading hide-if-no-js">' . __( 'Loading&hellip;' ) . '</p>';1169	$loading   .= wp_get_admin_notice(1170		__( 'This widget requires JavaScript.' ),1171		array(1172			'type'               => 'error',1173			'additional_classes' => array( 'inline', 'hide-if-js' ),1174		)1175	);1176 1177	if ( empty( $check_urls ) ) {1178		$widgets = get_option( 'dashboard_widget_options' );1179 1180		if ( empty( $widgets[ $widget_id ]['url'] ) && ! $doing_ajax ) {1181			echo $loading;1182			return false;1183		}1184 1185		$check_urls = array( $widgets[ $widget_id ]['url'] );1186	}1187 1188	$locale    = get_user_locale();1189	$cache_key = 'dash_v2_' . md5( $widget_id . '_' . $locale );1190	$output    = get_transient( $cache_key );1191 1192	if ( false !== $output ) {1193		echo $output;1194		return true;1195	}1196 1197	if ( ! $doing_ajax ) {1198		echo $loading;1199		return false;1200	}1201 1202	if ( $callback && is_callable( $callback ) ) {1203		array_unshift( $args, $widget_id, $check_urls );1204		ob_start();1205		call_user_func_array( $callback, $args );1206		// Default lifetime in cache of 12 hours (same as the feeds).1207		set_transient( $cache_key, ob_get_flush(), 12 * HOUR_IN_SECONDS );1208	}1209 1210	return true;1211}