微信自动登录获取openid

微信小程序自动登录之后会获取到一个code。

把code传入以下php代码。可以直接获取openid

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class Demo
{
    protected $appid = 'your_appid';
    protected $appsecret = 'your_appsecret';
    public function getOpenidByCode($code)
        {
            //缓存access_token  open_id
            $url = "https://api.weixin.qq.com/sns/jscode2session?appid=" . $this->appid . "&secret=" . $this->appsecret . "&js_code=" . $code . "&grant_type=authorization_code";
            $weixin = file_get_contents($url);//通过code换取网页授权access_token
            $jsondecode = json_decode($weixin, true); //对JSON格式的字符串进行编码
            $openid = $jsondecode['openid'];//输出openid
            return $openid;
        }
}