Error Identifier: traitUse.interface

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);

interface Printable
{
	public function print(): void;
}

class Document
{
	use Printable;
}

Why is it reported? #

The use statement inside a class body is attempting to use an interface as if it were a trait. The use keyword in a class body is reserved for traits. Interfaces must be implemented using the implements keyword in the class declaration. This code will result in a fatal error at runtime.

How to fix it #

Replace the use statement with implements in the class declaration.

 <?php declare(strict_types = 1);
 
 interface Printable
 {
 	public function print(): void;
 }

-class Document
+class Document implements Printable
 {
-	use Printable;
+	public function print(): void
+	{
+		echo 'Printing document';
+	}
 }

How to ignore this error #

You can use the identifier traitUse.interface to ignore this error using a comment:

// @phpstan-ignore traitUse.interface
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: traitUse.interface

Rules that report this error #

PHPStan\Rules\Classes\ExistingClassInTraitUseRule [1]

Edit this page on GitHub

Theme