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<?php abstract class A { public static function get() { static $instance = null; if ($instance === null) { $instance = new static(); } return $instance; } } final class B extends A { } final class C extends A { } var_dump(A::get()); var_dump(B::get()); var_dump(C::get());
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Cannot instantiate abstract class A in /in/ZsPi2:6 Stack trace: #0 /in/ZsPi2(18): A::get() #1 {main} thrown in /in/ZsPi2 on line 6
Process exited with code 255.

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