closure.useSuperGlobal

Code example

<?php declare(strict_types = 1);

$fn = function () use ($_GET) {
    return $_GET['key'];
};

Why is it reported?

PHP does not allow using superglobal variables ($_GET, $_POST, $_SERVER, $_COOKIE, $_FILES, $_SESSION, $_REQUEST, $_ENV, $GLOBALS) as lexical variables in a closure use clause. Superglobals are already available in every scope, so importing them is unnecessary and produces a fatal error.

How to fix it

Remove the superglobal from the use clause and access it directly inside the closure:

 <?php declare(strict_types = 1);

-$fn = function () use ($_GET) {
+$fn = function () {
     return $_GET['key'];
 };