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Error Identifier: argument.staticClosure

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
{
	/**
	 * @param-closure-this Foo $callback
	 */
	public function doFoo(Closure $callback): void
	{
	}
}

$foo = new Foo();
$foo->doFoo(static function (): void {
	// ...
});

Why is it reported? #

The parameter expects a bindable closure (one that can access $this), but a static closure was passed. Static closures declared with the static keyword cannot be bound to an object, so they cannot access $this.

A method advertises that its parameter needs a bindable closure by using the @param-closure-this PHPDoc tag. Passing a static closure to such a parameter will fail at runtime.

How to fix it #

Remove the static keyword from the closure:

-$foo->doFoo(static function (): void {
+$foo->doFoo(function (): void {
 	// ...
 });

How to ignore this error #

You can use the identifier argument.staticClosure to ignore this error using a comment:

// @phpstan-ignore argument.staticClosure
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: argument.staticClosure

Rules that report this error #

• PHPStan\Rules\Classes\ClassAttributesRule [1]
• PHPStan\Rules\Classes\ClassConstantAttributesRule [1]
• PHPStan\Rules\Classes\InstantiationRule [1]
• PHPStan\Rules\Constants\ConstantAttributesRule [1]
• PHPStan\Rules\EnumCases\EnumCaseAttributesRule [1]
• PHPStan\Rules\Functions\ArrowFunctionAttributesRule [1]
• PHPStan\Rules\Functions\CallCallablesRule [1]
• PHPStan\Rules\Functions\CallToFunctionParametersRule [1]
• PHPStan\Rules\Functions\CallUserFuncRule [1]
• PHPStan\Rules\Functions\ClosureAttributesRule [1]
• PHPStan\Rules\Functions\FunctionAttributesRule [1]
• PHPStan\Rules\Functions\ParamAttributesRule [1]
• PHPStan\Rules\Methods\CallMethodsRule [1]
• PHPStan\Rules\Methods\CallStaticMethodsRule [1]
• PHPStan\Rules\Methods\MethodAttributesRule [1]
• PHPStan\Rules\Properties\PropertyAttributesRule [1]
• PHPStan\Rules\Properties\PropertyHookAttributesRule [1]
• PHPStan\Rules\Traits\TraitAttributesRule [1]

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