Error Identifier: staticProperty.nameNotString

← Back to staticProperty.*

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
{
	public static string $bar = '';

	public function test(array $name): void
	{
		echo self::${$name};
	}
}

Why is it reported? #

When accessing a static property dynamically with the Foo::${$name} syntax, the $name expression must produce a string. PHP casts the name to string at runtime, so a string, an int, or an object implementing Stringable are all accepted. Values that cannot be cast to a string — such as an array or a plain object — are invalid and result in an error. In the example above, $name is an array, which cannot be used as a property name.

This check is currently part of Bleeding Edge.

How to fix it #

Ensure the dynamic static property name can be cast to a string:

-	public function test(array $name): void
+	public function test(string $name): void
 	{
 		echo self::${$name};
 	}

If the property name is known, access it directly instead:

 	public function test(array $name): void
 	{
-		echo self::${$name};
+		echo self::$bar;
 	}

How to ignore this error #

You can use the identifier staticProperty.nameNotString to ignore this error using a comment:

// @phpstan-ignore staticProperty.nameNotString
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: staticProperty.nameNotString

Rules that report this error #

• PHPStan\Rules\Classes\ClassConstantRule [1]
• PHPStan\Rules\Methods\CallMethodsRule [1]
• PHPStan\Rules\Methods\CallStaticMethodsRule [1]
• PHPStan\Rules\Properties\AccessPropertiesInAssignRule [1]
• PHPStan\Rules\Properties\AccessPropertiesRule [1]
• PHPStan\Rules\Properties\AccessStaticPropertiesInAssignRule [1]
• PHPStan\Rules\Properties\AccessStaticPropertiesRule [1]
• PHPStan\Rules\Variables\DefinedVariableRule [1]