Description:
------------
Place a url in a section of PHP code.
PHP accepts it
PHP gives neither an error nor a 500 response.

I intended to comment out the URL, but forgot.
PHP should have complained, but did not.

Test script:
---------------
<?php
ini_set('display_errors','On');
// On the next line, any URL can be used.
http://encosia.com/5-steps-toward-jquery-mastery/
?>

Expected result:
----------------
I expect a 500 fault.
The URL contains "//", which comments out most of the URL.
What is left is "http:" .
The parser is accepting "http:" without balking.