new.trait

Code example

<?php declare(strict_types = 1);

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

$obj = new MyTrait(); // error: Cannot instantiate trait MyTrait.

Why is it reported?

Traits in PHP are not standalone classes and cannot be instantiated with the new keyword. A trait is a mechanism for code reuse — it provides methods that can be included in one or more classes using the use keyword. Attempting to instantiate a trait will result in a fatal error at runtime.

How to fix it

Use the trait inside a class and instantiate that class instead:

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

+class MyClass
+{
+	use MyTrait;
+}
+
-$obj = new MyTrait();
+$obj = new MyClass();