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<?php class Singleton { protected static $instance = null; protected function __construct() { //Thou shalt not construct that which is unconstructable! } protected function __clone() { //Me not like clones! Me smash clones! } public static function getInstance() { if (!isset(static::$instance)) { static::$instance = new static; } return static::$instance; } } class Foobar extends Singleton {}; $foo = Foobar::getInstance();
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