What is the behavior of the `$_REQUEST` superglobal when `request_order` is set in php.ini?

Explanation

The `$_REQUEST` superglobal is populated with the contents of `$_GET`, `$_POST`, and `$_COOKIE`. The `request_order` directive in php.ini determines the order in which these arrays are merged. If a key exists in multiple arrays, the last one processed overwrites the previous ones, making the configuration critical for security and data integrity.

Key points

$_REQUEST is a merged array of GET, POST, and COOKIE.
request_order controls the merge sequence.
Overwriting behavior depends on the order of variables.

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