Building a Singleton Trait with PHP 5.4

Question

We recently had a discussion if it was possible to build a trait Singleton PHP Traits and we played around with it a possible Implementation but ran into issues

Answer 1

I created one a while ago when i was bored trying to learn traits. It uses reflection and the __CLASS__ constant

Trait:

trait Singleton
{
private static $instance;

public static function getInstance()
{
    if (!isset(self::$instance)) {
        $reflection     = new \ReflectionClass(__CLASS__);
        self::$instance = $reflection->newInstanceArgs(func_get_args());
    }

    return self::$instance;
}
final private function __clone(){}
final private function __wakeup(){}
}

This way you can continue to use the __construct() method and don't need to use an arbitrary function as the constructor.