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<?php trait Singleton { public static function getInstance(){ static $counter = 0; static $instance = null; if (!isset($instance)) { echo 'new instance has been set'; $instance = new static(); } $counter++; echo "$counter\n"; 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,$b);
Output for git.master, git.master_jit, rfc.property-hooks
new instance has been set1 2 3 4 5 6 object(a1)#1 (0) { } object(a1)#1 (0) { }

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