In a generic php script such as www.example.com/somewhat/myscript.php/somewhatelse?myvariable=whatever, following PHP constants will give following different results:

PHP_SELF $_SERVER['PHP_SELF'] /somewhat/myscript.php
PATH_INFO $_SERVER['PATH_INFO'] /somewhat
SCRIPT_NAME $_SERVER['SCRIPT_NAME'] /somewhat/myscript.php
REQUEST_URI $_SERVER['REQUEST_URI'] /somewhat/myscript.php/somewhatelse?myvariable=whatever

 

 

 

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