Error Identifier: classConstant.finalNotSupported

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);

class Foo
{
    final public const BAR = 'baz'; // reported
}

Why is it reported? #

The final modifier for class constants was introduced in PHP 8.1. Using it with an earlier PHP version results in a syntax error. PHPStan reports this when the configured PHP version does not support final constants.

How to fix it #

If upgrading to PHP 8.1 or later is not possible, remove the final modifier from the constant declaration.

 class Foo
 {
-    final public const BAR = 'baz';
+    public const BAR = 'baz';
 }

Non-ignorable error #

This error cannot be ignored using @phpstan-ignore or the ignoreErrors configuration. Non-ignorable errors indicate code that would cause a crash or a fatal error at runtime, or a fundamental problem in the analysed code that must be addressed.

Rules that report this error #

PHPStan\Rules\Constants\FinalConstantRule [1]

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