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Error Identifier: trait.unused

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);

trait Loggable
{
	public function log(string $message): void
	{
		echo $message;
	}
}

Why is it reported? #

The trait is declared but never used by any class in the analysed codebase. PHPStan analyses traits in the context of the classes that use them, so a trait that is not used anywhere is never analysed for errors. This means bugs inside the trait would go undetected.

See: How PHPStan analyses traits

How to fix it #

Use the trait in at least one class so that PHPStan can analyse its code, or remove the trait if it is no longer needed.

 <?php declare(strict_types = 1);
 
 trait Loggable
 {
 	public function log(string $message): void
 	{
 		echo $message;
 	}
 }
+
+class UserService
+{
+	use Loggable;
+}

How to ignore this error #

You can use the identifier trait.unused to ignore this error using a comment:

// @phpstan-ignore trait.unused
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: trait.unused

Rules that report this error #

• PHPStan\Rules\Traits\NotAnalysedTraitRule [1]

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