public function __construct($url)
{
if (extension_loaded('curl')) {
//实例化curl类
$curl = new Curl('get', $url);
//TODO可以用Regiter去保存
$this->output = $curl->output;
} else {
//实例化Socket类 并传入url和设置超时时常
$socket = new Socket($url, 10);
//调用getMethod去模拟GET请求
$socket->getMethod();
//获取响应body
$this->output = $socket->getResponseBody();
}
}