[PHP] __FILE__ plus variables?

[Sam Folk-Williams]

I have a password protected site. If you go to an inside page before 
logging in, it redirects you to the log in page. I would like to grab 
the URL that a user tries to access and send them back there after they 
log in. I'm using __FILE__ to get the file name (secondary.php for 
example) but that doesn't return the variables 
(secondary.php?cat_id=267). Is there a way for me to get the full URL 
not just the filename?

Sam

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