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<?php trait Singleton { final public static function getInstance() { if (!isset(static::$instance)) { static::$instance = new static; } return static::$instance; } } abstract class Abudabia { use Singleton; } abstract class Mozambik { use Singleton; } class a1 extends Abudabia { public function set() { return 'allah ahbar'; } } class a2 extends Mozambik { public function get() { return 'algazira'; } } $a = a1::getInstance(); $b = a2::getInstance(); var_dump($a->set(),$b->get());
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Access to undeclared static property a1::$instance in /in/jOIQT:7 Stack trace: #0 /in/jOIQT(38): Abudabia::getInstance() #1 {main} thrown in /in/jOIQT on line 7
Process exited with code 255.

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