Error Identifier: classConstant.notSupported

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);

function getClass(object $obj): string
{
	return $obj::class;
}

Why is it reported? #

Accessing ::class on an expression (such as a variable) is only supported on PHP 8.0 and later. If your project targets an earlier PHP version, this syntax will cause a fatal error.

How to fix it #

Use get_class() instead:

 <?php declare(strict_types = 1);
 
 function getClass(object $obj): string
 {
-	return $obj::class;
+	return get_class($obj);
 }

Or update the PHP version requirement for your project to PHP 8.0 or later.

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\Classes\ClassConstantRule [1]

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