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Error Identifier: class.implementsDeprecatedTrait

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);

/** @deprecated Use NewInterface instead */
trait OldTrait
{
}

class Foo implements OldTrait
{
}

Why is it reported? #

This error is reported by the phpstan-deprecation-rules extension.

A class has a deprecated trait in its implements clause. The trait is marked as @deprecated and is planned for removal.

In the example above, class Foo references OldTrait in its implements clause, and OldTrait is deprecated. Note that using a trait in implements is also invalid PHP – only interfaces can be implemented. Traits should be included with use instead.

How to fix it #

Replace the deprecated trait with a proper interface:

 <?php declare(strict_types = 1);
 
-class Foo implements OldTrait
+class Foo implements NewInterface
 {
 }

How to ignore this error #

You can use the identifier class.implementsDeprecatedTrait to ignore this error using a comment:

// @phpstan-ignore class.implementsDeprecatedTrait
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: class.implementsDeprecatedTrait

Rules that report this error #

• PHPStan\Rules\Deprecations\RestrictedDeprecatedClassNameUsageExtension [1] phpstan/phpstan-deprecation-rules

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