[PHP] Using header(0 to manage user inactivity

[C Drozdowski]

I'd like to be able to "timeout" a user if they are inactive for X 
minutes. Say, if they walk away from the browser leaving sensivive data 
in plain view.

Is there any reason that using the header() function as below wouldn't 
be a reliable way to do this (albeit user-unfriendly)? It "works for 
me" on my Mac with various browsers, but I wonder how universally it 
will work.

$timeout = 900;  // 15 minutes
header('Refresh: ' . $timeout . ';url=www.whatever.com/logout.php');
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