Error Identifier: magicConstant.outOfClass

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);

echo __CLASS__;

Why is it reported? #

The magic constant __CLASS__ is used outside of a class definition, where it always evaluates to an empty string ''. This is almost never the intended behaviour and usually indicates that the code was moved out of a class without updating the constant reference.

How to fix it #

Move the code inside a class, or use a different way to get the class name:

-echo __CLASS__;
+class Foo
+{
+	public function printName(): void
+	{
+		echo __CLASS__; // outputs "Foo"
+	}
+}

If the code is in a function and needs the caller’s class name, accept it as a parameter:

-function logContext(): void
+function logContext(string $className): void
 {
-	echo __CLASS__;
+	echo $className;
 }

How to ignore this error #

You can use the identifier magicConstant.outOfClass to ignore this error using a comment:

// @phpstan-ignore magicConstant.outOfClass
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: magicConstant.outOfClass

Rules that report this error #

PHPStan\Rules\Constants\MagicConstantContextRule [1]

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