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);
}