Top "Superglobals" questions

Superglobals are built-in variables that are always available in all scopes.

What is the value in '$_SERVER['UNIQUE_ID'] used for?

I can't find any mention of it in the documentation, but there seems to be an additional entry in the $_…

php superglobals
What happens if you assign a value to $_REQUEST?

I recently came across this line in a PHP script: $_REQUEST['start_date']=$date; Is it allowed or useful in …

php superglobals