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<?php trait Singleton { protected static $instance; public static function getInstance(){ if (!isset(static::$instance)) { static $instance = 'aaa'; } return static::$instance; } } abstract class Abudabia { use Singleton; } class a1 extends Abudabia { public function set() { return 'allah ahbar'; } } class a2 extends Abudabia { public function get() { return 'algazira'; } } $a = a1::getInstance(); $b = a2::getInstance(); var_dump($a, $a->set(),$b);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Call to a member function set() on null in /in/pEEPY:36 Stack trace: #0 {main} thrown in /in/pEEPY on line 36
Process exited with code 255.

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