php: load and save xml

xmltest.php

<?php

$fileName = "fun.xml";
$keystorepath = "this/is/a/path.jks";
$keystorepassword = "keystorepassword";

$fileContents = file_get_contents($fileName);

$xml = simplexml_load_string($fileContents);

foreach ($xml->Root->VHost->HostPortList->HostPort as $property) {

  if ($property->Name == "Default SSL Streaming") {
    $property->SSLConfig->KeyStorePath = $keystorepath;
    $property->SSLConfig->KeyStorePassword = $keystorepassword;
    $property->SSLConfig->KeyStoreType = "JKS";
    //var_dump($property);
  }
}


$xml->asXml($fileName);

echo "...done.";

?>