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<?php trait Singleton { public static function getInstance(){ static $counter = 0; static $instance = null; if (!isset($instance)) { $instance = new static(); } $counter++; return $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(); $a = a1::getInstance(); $b = a2::getInstance(); $a = a1::getInstance(); $b = a2::getInstance(); var_dump($a->counter,$b->counter);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined property: a1::$counter in /in/JImpo on line 41 Warning: Undefined property: a1::$counter in /in/JImpo on line 41 NULL NULL

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