PHP simpleXML example modify

example.simplexml.php

<?php
/* With simplexml, open an entire file (use XMLReader for big files) 
Example : <root><s name="abc">value</s>....</root>*/
$xml = simplexml_load_file($xml_source_path);
//find the elemnt by attribute's value (name=..)
$result = $xml->xpath('//s[@name="'.$element_name.'"]'); 
//heres the trick - the first result of xpath, and the node value (stored in [0])
$result[0][0] = $new_value; 
//here you can do a foreach, to cross over all results (all "s" elements with the same name"
 if ($xml->asXML($xml_source_path) === false)
	{
	throw new Exception('Cannot save values into "'.$xml_source_path.'"',99);
}
return true;