<?php declare(strict_types=1); trait T { abstract function foo(): string; function bar(): string { return $this->foo(); } } abstract class A { use T; } /* class B extends A { // This fatals as expected function foo() { return 'some string'; } } */ class C { use T; // This does not function foo() { return 'some string'; } } class D { use T; // This ALSO does not function foo(): int { return 3; } } abstract class E { use T; // Nor this function foo() { return 'some thing'; } } (new D())->bar();
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