Description:
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From manual page: http://www.php.net/reserved.variables.request
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Documentation states the $_REQUEST is "An associative array that by default contains the contents of $_GET, $_POST and $_COOKIE."
In PHP 7.2.7 (and likely several versions lower), $_COOKIE is not part of $_REQUEST by default, though it could be re-enabled via php.ini. The default behavior is to only include $_GET and $_POST in request_order "due to security concerns", likely because adding C for $_COOKIES enables a wider breadth for value shadowing attacks.

Test script:
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Not applicable.