Hello, I wrote this code to quickly edit an existing XML file and save changes to the file. However, it doesn't seem to be writing my data to the xml file. Am I using asXML() wrong? Thanks for your help.

<?php

 $xml = simplexml_load_file("../xml/emp.xml");


 $xml->employee[0]['empID'] = $_POST['empID'];

 $xml->employee[0]->empFN = $_POST['first'];

 $xml->employee[0]->empLN = $_POST['last'];

 $xml->employee[0]->empDept['number'] = $_POST['num'];

 $xml->employee[0]->empDept->empSup = $_POST['supv'];

 $xml->employee[0]->emp_ext = $_POST['ext'];

 $xml->employee[0]->k_plan = $_POST['plan'];


 $xml->asXML();

 header('Location: confirm_form.php');

?>