code: public function deCookie ()
  	{
  		if (isset($this->header['cookie'])) {
  			$cookies = explode(';', $this->header['cookie']);
  			foreach ($cookies as $val) {
  				$_tmp                           = explode('=', $val);
  				$this->cookie[ trim($_tmp[0]) ] = $_tmp[1];
  			}
  		}
  
  		if (isset($this->cookie['SFMBSESSION'])) {
  			$this->session_id = $this->cookie['SFMBSESSION'];
  		}
  		else {
  			$this->session_id = md5(uniqid());
  		}
  	}
docs: 解析cookie
  
  @return bool