singleton.class.php

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<?php
abstract class singleton {
        
        /*
         * @brief array containing the singleton instances
         */
        protected static $_instances = array();
        
        protected function __construct() {

        }

        public static function instance() {
        
                $class = get_called_class();
                if(array_key_exists($class, self::$_instances) === false) {
                        self::$_instances[$class] = new static();
                }
                
                return self::$_instances[$class];

        }

        public function __clone() {
                Error::syserrorMessage('singleton', '__clone', __("CannotCloneSingleton"), __LINE__);
        }
        
        public function __sleep() {
                Error::syserrorMessage('singleton', '__sleep', __("CannotSerializeSingleton").get_called_class(), __LINE__);
        }
        
        public function __wakeup() {
                Error::syserrorMessage('singleton', '__wakeup', __("CannotSerializeSingleton"), __LINE__);
        }

}

?>