>$_REQUEST is an associative array consisting of the contents of $_GET,
>$_POST, $_COOKIE, and $_FILES

Also, they are not function but arrays, as Hatem said. 
You can usa $_REQUEST as a "catch-all" that provides you with both what
was passed to your page through the URL query ($_GET) and what was
posted to the webserver through HTTP ($_POST). IMHO, it's always better
to use the more specific arrays ($_GET or $_POST), because that makes
your pages more accurate and, therefore, less open to possible attacks.

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