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Error Identifier: trait.duplicateMethod

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 MyTrait
{
	public function doSomething(): void
	{
	}

	public function doSomething(): void
	{
	}
}

Why is it reported? #

A trait declares the same method more than once. PHP does not allow two methods with the same name in a single trait. This is a fatal error.

In the example above, the method doSomething() is declared twice in the trait MyTrait.

How to fix it #

Remove the duplicate method declaration, keeping only one:

 <?php declare(strict_types = 1);
 
 trait MyTrait
 {
 	public function doSomething(): void
 	{
 	}
-
-	public function doSomething(): void
-	{
-	}
 }

If the duplicate methods were intended to have different behavior, rename one of them:

 <?php declare(strict_types = 1);
 
 trait MyTrait
 {
 	public function doSomething(): void
 	{
 	}

-	public function doSomething(): void
+	public function doSomethingElse(): void
 	{
 	}
 }

Non-ignorable error #

This error cannot be ignored using @phpstan-ignore or the ignoreErrors configuration. Non-ignorable errors indicate code that would cause a crash or a fatal error at runtime, or a fundamental problem in the analysed code that must be addressed.

Rules that report this error #

• PHPStan\Rules\Classes\DuplicateDeclarationRule [1]

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