公众号静默授权

微信公众号静默授权，转发页面并附带code

public function demo () {
        // 授权地址
        $url = "";
        // 判断浏览器信息
        if (strpos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') == true) {
                //配置参数的数组
                $CONF =  array(
                    '__APPID__' =>'公众号的appid',
                    '__SERECT__' => '公众号的serect',
                    '__CALL_URL__' =>$url //当前页地址
                );
                //没有传递code的情况下，先登录一下
                if(!isset($_GET['code']) || empty($_GET['code'])){
                    $getCodeUrl = "https://open.weixin.qq.com/connect/oauth2/authorize".
                        "?appid=" . $CONF['__APPID__'].
                        "&redirect_uri=" . $CONF['__CALL_URL__'].
                        "&response_type=code".
                        "&scope=snsapi_base".     #!!!scope设置为snsapi_base !!!
                        "&state=123";
                    //跳转微信获取code值,去登陆
                    header('Location:' . $getCodeUrl);
                    exit;
                }else{
                    $code = trim($_GET['code']);
                    $url = $url.$code;
                    return redirect($url);
                }
        }else{
            echo "请在微信客户端打开链接";
            exit();
        }
}

通过code解析openid

$code = $postData['code'];
//配置参数的数组
$CONF =  array(
      '__APPID__' =>'',
      '__SERECT__' => ''
);
//使用code，拼凑链接获取用户openid
$str = "https://api.weixin.qq.com/sns/oauth2/access_token".
       "?appid={$CONF['__APPID__']}".
       "&secret={$CONF['__SERECT__']}".
       "&code={$code}".
       "&grant_type=authorization_code";
//拿到openid
$html = json_decode(file_get_contents($str),1);
$openid = $html['openid'];

判断code是否过期

# 如果有键errcode
if(array_key_exists('errcode', $html) == true){
     if($html['errcode'] == 40163){
          $arr = [
                'code'=>40163,
                'msg'=>'code失效'
          ];
          return json($arr);
     }
}