Extending singletons in PHP

Question

I\'m working in a web app framework, and part of it consists of a number of services, all implemented as singletons. They all extend a Service class, where the singleton behavio

Answer 1

This is fixed Johan's answer. PHP 5.3+

abstract class Singleton
{
    protected function __construct() {}
    final protected function __clone() {}

    final public static function getInstance()
    {
        static $instance = null;

        if (null === $instance)
        {
            $instance = new static();
        }

        return $instance;
    }
}