Online PHP editor | output for 17HIf

<?php abstract class tfXmlHelper { private function a2x($array, &$xml_obj) { foreach ($array as $key => $value) { if (is_array($value)) { $key = is_numeric($key) ? "item$key" : $key; $subnode = $xml_obj->addChild("$key"); self::a2x($value, $subnode); } else { $key = is_numeric($key) ? "item$key" : $key; $xml_obj->addChild("$key", "$value"); } } } public static function xml_encode($array) { $xml_obj = new SimpleXMLElement("<root></root>"); self::a2x($array, $xml_obj); return $xml_obj->asXML(); } } class XmlHelper extends tfXmlHelper { } $test_obj = array( 'key' => 'value', 'item' => array( 'stuff', 'more_stuff' ) );