public function http_get_data($url) {
    if(!$url){return '';}

     $ch = curl_init ();
     curl_setopt ( $ch, CURLOPT_CUSTOMREQUEST, 'GET' );
     curl_setopt ( $ch, CURLOPT_SSL_VERIFYPEER, false );
     curl_setopt ( $ch, CURLOPT_URL, $url );
     ob_start ();
     curl_exec ( $ch );
     $return_content = ob_get_contents ();
     ob_end_clean ();
     $return_code = curl_getinfo ( $ch, CURLINFO_HTTP_CODE );

    $filename = date('YmdHis') . rand(1000, 9999).".jpg";// uniqid("chat_img_",false);
    $savePath = '/uploads/sutui/' . date("Ymd") . '/';
    #存本项目web下面
   $path = dirname(Yii::$app->BasePath) . '/web' . $savePath;
    if (!file_exists($path)) {
        mkdir($path, 0755, true);
    }
    $fp= @fopen($path.$filename,"a"); //将文件绑定到流
    fwrite($fp,$return_content); //写入文件

     return $savePath.$filename;
 }