PHP实现微信公众号授权获取用户信息

class WxAuthModel extends BaseModel
{
    var $appId = APPID;
    var $appSecret = APPSECRET;

    /*微信x小程序，获取微信openid
     *前端的回调url：填写成你的请求地址，然后微信会自己在这个回调url后加一个code,获取通过url传过来的code来换取access_token
    */
    public function get_access_token($code){
        $token_url = "https://api.weixin.qq.com/sns/jscode2session?appid=".$this->appId."&secret=".$this->appSecret."&js_code=".$code."&grant_type=authorization_code";
        $token_info = $this->http_request($token_url);
        return json_decode($token_info, true);
    }

    //HTTP请求（支持HTTP/HTTPS，支持GET/POST）
    private function http_request($url, $data = null)
    {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
        if (!empty($data)){
            curl_setopt($curl, CURLOPT_POST, TRUE);
            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        }
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
        $output = curl_exec($curl);
        curl_close($curl);
        file_put_contents('/tmp/heka_weixin.' . date("Ymd") . '.log', date('Y-m-d H:i:s') . "\t" . $output . "\n", FILE_APPEND); //记录微信请求日志
        return $output;
    }

}