Error Identifier: traitUse.deprecatedClass

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 NewFeature instead */
class OldFeature
{
}

class Foo
{
	use OldFeature;
}

Why is it reported? #

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

A use statement in a class body references a deprecated class. The class has been marked with @deprecated and is scheduled for removal or replacement. Any usage of it should be migrated to the recommended alternative.

How to fix it #

Replace the deprecated class with the recommended replacement:

 class Foo
 {
-	use OldFeature;
+	use NewFeature;
 }

If the calling code is itself deprecated, the error will not be reported. Mark the class as deprecated if it is part of a deprecation migration:

+/** @deprecated */
 class Foo
 {
 	use OldFeature;
 }

How to ignore this error #

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

// @phpstan-ignore traitUse.deprecatedClass
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.deprecatedClass

Rules that report this error #

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

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