URL parsing, help

With a lot of search in Google I made it in JS but there is a part I'd
like to be in PHP and I can't find how to do it.

From a page that usually display in a frame I have this JS :

if (self == top) { top.location.href="/index.php?url=test.php"; }

Now you may have guessed what I'm trying to do, load the top page but
with the frame I passed in the URL

I successfully achieved my goal with JS but I think it would be nice
using PHP.

How can I extract only "test.php" from the URL so I can:

<?php echo "<iframe src=\'" + url + "'>" ?>


Thanks
.

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