how to search for a particular node in xml using php ?

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PHP

i have error as " Fatal error: Call to undefined method DOMDocument::xpath() in C:\xampp\htdocs\myproject "


pls tell me how to search a node in php .. i search as ..

$ModuleValue=$xml->xpath("//Course[Module/Module_id='$value']") ;


my xml is as given below ..


<course>
<login>1
<version>1.2.3.5
<course_id>1
<course_name>physics
<module module_id="1">
<page>1

<module module_id="2">
<page>12

<module module_id="3">
<page>4