Array ( [subaction] => userinfo [user] => ShutteR19 )
How to get value "ShutteR19" from this array?
$GET is an array like $POST and this is a value from the Query string.
So refering to the entity by its array name will return its value.
$GET['item'] returns 14
$GET['bay'] returns 149
$_GET['box'] returns 3
And if outputting to the browser, you might find this makes it a bit clearer, especially if you get into multi-dimensional arrays:
echo "<pre>".print_r($_GET, true)."</pre>";