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Error Identifier: parameter.deprecatedTrait

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 NewHelper instead */
trait OldHelper
{
}

class Foo
{
	use OldHelper;
}

function process(Foo $foo): void
{
	// ...
}

Why is it reported? #

A function or method parameter has a type declaration that references a class using a deprecated trait. The trait has been marked with a @deprecated PHPDoc tag, indicating it is scheduled for removal or replacement.

This rule is provided by the phpstan-deprecation-rules package.

How to fix it #

Replace the deprecated trait with its recommended replacement in the class:

 class Foo
 {
-	use OldHelper;
+	use NewHelper;
 }

Or update the parameter type to use a class that does not depend on the deprecated trait:

-function process(Foo $foo): void
+function process(Bar $bar): void
 {
 	// ...
 }

How to ignore this error #

You can use the identifier parameter.deprecatedTrait to ignore this error using a comment:

// @phpstan-ignore parameter.deprecatedTrait
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: parameter.deprecatedTrait

Rules that report this error #

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

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