trait.duplicate - Phpstan

Code example

This error is reported when the same trait name is declared in multiple files within the analysed codebase:

php

// file1.php
<?php declare(strict_types = 1);

namespace App\Helpers;

trait MyTrait
{
	public function doSomething(): void
	{
	}
}

php

// file2.php
<?php declare(strict_types = 1);

namespace App\Helpers;

trait MyTrait
{
	public function doSomethingElse(): void
	{
	}
}

Why is it reported?

The same trait name is declared in multiple files within the registered stub files.

How to fix it

Rename one of the duplicate traits to give it a unique fully qualified name:

diff-php

 <?php declare(strict_types = 1);

 // file2.php
-namespace App\Helpers;
+namespace App\Legacy;

-trait MyTrait
+trait LegacyTrait
 {
 	public function doSomethingElse(): void
 	{
 	}
 }

Or remove the duplicate declaration if it was unintentional.