<?php
//Create a new DOM document
$dom = new DomDocument();
//Create the departs tag in the root node
$departs = $dom->createElement('departs');
$dom->appendChild($departs);
//Create a depart subtitle under the departs tag
$depart = $dom->createElement('depart');
$departs->appendChild($depart);
//Create employees sub-label under the depart tag
$employees = $dom->createElement('employees');
$depart->appendChild($employees);
//Create employee subtitles under the employee tag
$employee = $dom->createElement('employee');
$employees->appendChild($employee);
//Create serial_no sub-tag under employee tag
$serial_no = $dom->createElement('serial_no');
$employee->appendChild($serial_no);
//Add value node 100001 to serial_no tag
$serial_no_value = $dom->createTextNode('100001');
$serial_no->appendChild($serial_no_value);
//Output XML data
echo $dom->saveXML();
?>