how can i search for a particular node for a given value ?

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XML

PHP

My xml is formatted is as given below:

<course>
   <login>1</login>
   <version>1.2.3.5</version>
   <course_id>1</course_id>
   <course_name>physics</course_name>
   <module module_id="1">
          <page>1</page>
   </module>
   <module module_id="2">
          <page>12</page>
   </module>
   <module module_id="3">
          <page>4</page>
   </module>
</course>

Here is what I want:

if (a module node with module_id value 2 not exists than)

{
my code

}

how to find this node...

i was trying this ..

$value=$row['Module_id'];

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

{


}