PHP : How exactly is PHP creating superglobal $_POST, $_GET, $_COOKIE and $_REQUEST?

PHP : How exactly is PHP creating superglobal $_POST, $_GET, $_COOKIE and $_REQUEST?
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PHP : How exactly is PHP creating superglobal $_POST, $_GET, $_COOKIE and $_REQUEST?
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$_POST, superglobal exactly creating and : PHP is $_COOKIE How $_GET, PHP $_REQUEST?