Return "self" for the return type of a function inside a PHP trait

Question

In a PHP trait, can I use self as the return type of a method? Will it reference the class that imports the trait?

<?php

declare(strict_types=1);

trait MyTrait
{

    public function setSomething(array $data): self
                                             // ^ is this ok?
    {
        $this->update($data);
        return $this;
    }
}

Answer 1

In fact this is the ONLY thing you can do (referring to the instance or class).

class TestClass {
    use TestTrait;
}

trait TestTrait {
    public function getSelf(): self {
        echo __CLASS__ . PHP_EOL;
        echo static::class . PHP_EOL;
        echo self::class . PHP_EOL;

        return $this;
    }
}

$test = new TestClass;
var_dump($test->getSelf());

Output

TestClass
TestClass
TestClass
object(TestClass)#1 (0) {
}

Working example.