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<?phpclass dtc{	protected static $instance = null;		public static function get_instance()	{		if(is_null(dtc::$instance)) dtc::$instance = new dtc();		return dtc::$instance;	}		protected $in_tx;	protected $obj;		protected function __construct()	{		$this->in_tx = false;		$this->obj = array();	}		public function in_tx()	{		return $this->in_tx;	}		public function register($obj)	{		$this->obj[] = $obj;	}		public function begin()	{		try		{			foreach($this->obj as $v) $v->begin();			$this->in_tx = true;		}		catch(Exception $ex)		{			throw new dtc_abort_ex();		}	}		public function commit()	{		try		{			foreach($this->obj as $v) $v->commit();			$this->in_tx = false;		}		catch(Exception $ex)		{			throw new dtc_abort_ex();		}	}	public function rollback()	{		try		{			foreach($this->obj as $v) $v->rollback();			$this->in_tx = false;		}		catch(Exception $ex)		{			throw new dtc_abort_ex();		}	}}?>