微信网页授权获取用户openid及用户信息

$code = $_GET["code"];//获取code

$appid=“xxxx”;//公众号appid

$APPSECRET="xxx";//公众号appsecret

$url = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];//获取当前访问的网址url含参数标识，重定向用

$redirect_uri = urlencode ($url);//url转码

if($code){

    $oauth2Url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=$appid&secret=$APPSECRET&code=$code&grant_type=authorization_code";

    $oauth2 = request_get($oauth2Url);

    $access_token = $oauth2["access_token"];

    $openId = $oauth2['openid'];

    $get_user_info_url = "https://api.weixin.qq.com/sns/userinfo?access_token=$access_token&openid=$openId&lang=zh_CN";

    $userInfo = request_get($get_user_info_url);//用户信息，一个对象数组

    $openId=$userInfo['openid'];//用户openid

    $nickName=$userInfo['nickname'];//用户微信信息中的昵称

    $sex=$userInfo['sex'];//用户微信信息中的性别

    $wxCity=$userInfo['city'];//用户微信信息中的所在城市    

}else{

   $url ="https://open.weixin.qq.com/connect/oauth2/authorize?appid=$appid&redirect_uri=$redirect_uri&response_type=code&scope=snsapi_userinfo&state=1#wechat_redirect";

   header("Location:".$url);

}