--TEST-- SimpleXMLElement->addAttribute() --SKIPIF-- <?php if (!extension_loaded("simplexml")) die("skip"); ?> --FILE-- <?php $simple = simplexml_load_file(dirname(__FILE__)."/book.xml"); $simple->addAttribute('type','novels'); var_dump($simple->attributes()); echo "Done"; ?> --EXPECTF-- object(SimpleXMLElement)#2 (1) { ["@attributes"]=> array(1) { ["type"]=> string(6) "novels" } } Done