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<?php 
// set name of XML file 
$file = "pet.xml"; 

// load file 
$xml = simplexml_load_file($file) or die ("Unable to load XML file!"); 

// modify XML data 
$xml->name = "Sammy Snail"; 
$xml->age = 4; 
$xml->species = "snail"; 
$xml->parents->mother = "Sue Snail"; 
$xml->parents->father = "Sid Snail"; 

// write new data to file 
file_put_contents($file, $xml->asXML()); 
?>