PHP: Easy Question. Please help?

PHP: I include() a file that requires users to be logged in before then can access this page. What's the most secure way (A or B) to declare what level is required and why?
A)
//this page is secure
global $level = 9;
require_once('secure.php');

B)
//this page is secure
require_once('secure.php?lev=9');

Thank You.
 
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