Error Identifier: classConstant.private

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
{
	private const SECRET = 'hidden';
}

echo Foo::SECRET;

Why is it reported? #

The code is accessing a class constant that has private visibility from outside the class where it is declared. Private constants can only be accessed from within the same class.

How to fix it #

If you need to access the value from outside the class, change the constant’s visibility:

 <?php declare(strict_types = 1);
 
 class Foo
 {
-	private const SECRET = 'hidden';
+	public const SECRET = 'hidden';
 }

 echo Foo::SECRET;

Or provide a public method to access the value:

 <?php declare(strict_types = 1);
 
 class Foo
 {
 	private const SECRET = 'hidden';

+	public static function getSecret(): string
+	{
+		return self::SECRET;
+	}
 }

-echo Foo::SECRET;
+echo Foo::getSecret();

How to ignore this error #

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

// @phpstan-ignore classConstant.private
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.private

Rules that report this error #

PHPStan\Rules\Classes\ClassConstantRule [1]

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