php : xml parse and return xml

[h3ndr1k]

XML parsing isn't working\[code\]<?php $input = "file1.xml";$xml = simplexml_load_file($input);$data-content = $xml->data->getAssetResponse->content;$new-data = http://stackoverflow.com/questions/10440133/str_replace("NEW", "OLD", (string)$data-content);$xml_object->data->getAssetResponse->content = $new-data;print $xml_object->asXML(); ?>\[/code\]May I know why this isn't working?