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Error Identifier: staticMethod.protected

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
{
    protected static function baz(): void
    {
    }
}

class Unrelated
{
    public function doFoo(): void
    {
        Foo::baz();
    }
}

Why is it reported? #

The code calls a protected static method from a class that is not part of the declaring class hierarchy. Protected methods can only be called from within the declaring class or its descendants. Calling a protected method from an unrelated class results in a fatal error at runtime.

How to fix it #

If the method needs to be called from outside the class hierarchy, change its visibility to public:

 <?php declare(strict_types = 1);
 
 class Foo
 {
-    protected static function baz(): void
+    public static function baz(): void
     {
     }
 }

Alternatively, call it from within the class hierarchy by extending the declaring class:

 <?php declare(strict_types = 1);
 
-class Unrelated
+class Unrelated extends Foo
 {
     public function doFoo(): void
     {
-        Foo::baz();
+        static::baz();
     }
 }

How to ignore this error #

You can use the identifier staticMethod.protected to ignore this error using a comment:

// @phpstan-ignore staticMethod.protected
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: staticMethod.protected

Rules that report this error #

• PHPStan\Rules\Methods\CallStaticMethodsRule [1]
• PHPStan\Rules\Methods\StaticMethodCallableRule [1]

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