Error Identifier: argument.unused

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);

define('MY_CONST', 'value', true);

Why is it reported? #

The third argument $case_insensitive of define() is ignored since PHP 8.0. Declaration of case-insensitive constants was deprecated in PHP 7.3 and the parameter was removed in PHP 8.0. Passing this argument has no effect and is silently ignored.

How to fix it #

Remove the third argument:

 <?php declare(strict_types = 1);
 
-define('MY_CONST', 'value', true);
+define('MY_CONST', 'value');

How to ignore this error #

You can use the identifier argument.unused to ignore this error using a comment:

// @phpstan-ignore argument.unused
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: argument.unused

Rules that report this error #

PHPStan\Rules\Functions\DefineParametersRule [1]

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