function __construct($content)
{
parent::__construct();
$content['data'] = array_change_key_case($content['data'], CASE_LOWER);
//数组键名全小写，以满足推送 api 的要求
$temp = array('touser' => '', 'msgtype' => $content['type'], $content['type'] => $content['data']);
$this->_content = $temp;
$this->_api = sprintf($this->_api, $this->accessToken);
}
function __construct($resource)
{
parent::__construct($resource);
}