Reading XML File with PHP

<?php
  $q = $_GET["q"];

  $xml_doc = new DOMDocument();
  $xml_doc->load("cd_list.xml");

  $x = $xml_doc->getElementsByTagName('MUSICIAN');

  for ($i=0; $i< = $x->length-1; $i++) {
    //Set only to process nodes from elements
    if ($x->item($i)->nodeType==1) {
      if ($x->item($i)->childNodes->item(0)->nodeValue == $q) {
        $y=($x->item($i)->parentNode);
      }
    }
  }

  $cd = ($y->childNodes);

  for ($i=0; $i<$cd->length; $i++) { 
    //Set only to process nodes from elements
    if ($cd->item($i)->nodeType==1) {
      echo("<b>" . $cd->item($i)->nodeName . ":</b> ");
      echo($cd->item($i)->childNodes->item(0)->nodeValue);
      echo("<br>");
    }
  }
?>