Online PHP editor | refs for nHTkN

<?php interface TestInterface { public function test(): TestInterface; } trait TestTrait { public function test(): TestInterface { return $this; } } class TestClass implements TestInterface { use TestTrait; public function test2() : self { return $this; } } class TestClass2 extends TestClass {} $test = new TestClass; $test2 = new TestClass2; var_dump($test->test(), $test2->test2());