nitin gupta wrote:

for eg <div class="foo"></div> is selected by the following query.

$class = "foo";

$xpath->query("//*[@class = '".$class."']");

But, this fails in case of multiple classes, i.e. does not select this :

<div class="foo bar"> </div>

The "contains" function would probably work, eg (untested):
$xpath->query("//div[contains(@class, '" . $class . "')]");

One more question: is this url valid : http://xyz.com/path with space.html

Nope. You can escape the url if you just HAVE to have spaces:

http://n00b.com/path%20with%20space.html

but why not use dashes?

http://pro.com/path-with-properly-indexed-spaces.html

-Dom