trait.notFound

Code example

<?php declare(strict_types = 1);

namespace App;

class Foo
{
	use NonexistentTrait;
}

Why is it reported?

The use statement inside a class body references a trait that PHPStan cannot find. This can happen when:

• The trait name contains a typo
• A use import statement is missing
• The trait file is not included in the autoloader
• A Composer dependency is missing

At runtime, referencing a non-existent trait will cause a fatal error.

How to fix it

Make sure the trait exists and is properly autoloaded:

 <?php declare(strict_types = 1);

 namespace App;

+use App\Traits\ExistingTrait;
+
 class Foo
 {
-	use NonexistentTrait;
+	use ExistingTrait;
 }

If the trait comes from an external package, make sure the package is installed:

composer require vendor/package

If PHPStan cannot find a trait that does exist at runtime, configure the autoloader or scanFiles/scanDirectories in your PHPStan configuration.

Learn more: Discovering Symbols