interfaceExtends.trait

Code example

<?php declare(strict_types = 1);

trait MyTrait
{
}

interface MyInterface extends MyTrait
{
}

Why is it reported?

An interface declares that it extends a trait, which is not allowed in PHP. Interfaces can only extend other interfaces. Traits are a different kind of language construct used for horizontal code reuse via use statements in classes, not for interface inheritance.

How to fix it

If the target should be an interface, change the trait to an interface:

-trait MyTrait
+interface MyTrait
 {
 }

 interface MyInterface extends MyTrait
 {
 }

If the trait is correct, the interface should not extend it. Instead, a class can use the trait and implement the interface separately:

 trait MyTrait
 {
 }

-interface MyInterface extends MyTrait
+interface MyInterface
 {
 }
+
+class MyClass implements MyInterface
+{
+	use MyTrait;
+}