You can handle the F11 key using Javascript function, check the below javascript function.
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How to Get Current Page URL Using PHP
If you would like to know from which page the request has come from using post Method then there is a simple PHP script can solve your issue. Get Current Page URL Using PHP Check below script to Get Current page using PHP function getCurrentURLPage() { $s = empty($_SERVER[“HTTPS”]) ? ”: ($_SERVER[“HTTPS”] == “on”) ? […]