What's the difference between $_POST, $_GET, and $_REQUEST?

Question

I am bit confused about these super global variable ($_POST, $_GET, and $_REQUEST) in PHP. In which scenario do I need to use these va

Answer 1

Difference is:

$_GET retrieves variables from the querystring, or your URL.>

$_POST retrieves variables from a POST method, such as (generally) forms.

$_REQUEST is a merging of $_GET and $_POST where $_POST overrides $_GET.