php command to open a url?

[Ken Tozier <kentozier@xxxxxxxxxxx>]

I've been looking around in the php documentation for a couple of hours 
now but can't seem to find any functions to open a url in the current 
browser window. Does php allow this? If so, could someone point me to a 
link?

Basically what I'm trying to do is loop back in a login form until a 
user enters a valid username/password and then redirect to that user's 
personal info page.

Thanks for any help

Ken

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