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<?php trait Singleton { protected static $instance; final public static function getInstance() { if (!isset(static::$instance)) { static::$instance = new static; } return static::$instance; } } class a1{ use Singleton; } class a2{ use Singleton; } $a = a1::getInstance(); $b = a2::getInstance(); var_dump($a,$b);
Output for git.master, git.master_jit, rfc.property-hooks
object(a1)#1 (0) { } object(a2)#2 (0) { }

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