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<?php

class DB_Adapter_Mysql {

protected $_adapter = '';

public function __construct() {

$this->_adapter = 'MYSQL';

}

}

class DB {

public static function Connect($param1, $param2) {

return new DB_Adapter_Mysql();

}

}

class DatabaseConnection {

static $instance = null;

private $_handle = null;

public static function getInstance() {

if (!isset(self::$instance)) {

$className = __CLASS__;

self::$instance = new $className;

}

return self::$instance;

}

private function __construct() {

$dsn = 'mysql://root:password@localhost/photos';

$this->_handle = & DB::Connect($dsn, array());

}

public function handle() {

return $this->_handle;

}

public function __clone() {

trigger_error('Clone is not allowed.', E_USER_ERROR);

}

public function __wakeup() {

trigger_error('Unserializing is not allowed.', E_USER_ERROR);

}

}

var_dump(DatabaseConnection::getInstance()->handle());

var_dump(DatabaseConnection::getInstance()->handle());

?>