Error Identifier: classConstant.nonObject

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 foo(int $value): void
{
	echo $value::FOO;
}

Why is it reported? #

The code attempts to access a class constant using the :: operator on a value that is not an object or a class string. Class constants can only be accessed on objects, class names, or class-string types.

In the example above, $value is an int, which does not support class constant access.

How to fix it #

Ensure the value used for class constant access is an object or a class-string:

 <?php declare(strict_types = 1);
 
-function foo(int $value): void
+function foo(Foo $value): void
 {
 	echo $value::FOO;
 }

How to ignore this error #

You can use the identifier classConstant.nonObject to ignore this error using a comment:

// @phpstan-ignore classConstant.nonObject
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: classConstant.nonObject

Rules that report this error #

PHPStan\Rules\Classes\ClassConstantRule [1]

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