Error Identifier: closure.useSuperGlobal

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

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'];
 };

How to ignore this error #

You can use the identifier closure.useSuperGlobal to ignore this error using a comment:

// @phpstan-ignore closure.useSuperGlobal
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: closure.useSuperGlobal

Rules that report this error #

PHPStan\Rules\Functions\InvalidLexicalVariablesInClosureUseRule [1]

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