微信网页授权获取用户基本信息

微信开发文档：http://mp.weixin.qq.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html

首先引导用户去授权页面：
地址："https://open.weixin.qq.com/connect/oauth2/authorize?appid=appid&redirect_uri=redirect_uri&response_type=code&scope=SCOPE&state=STATE#wechat_redirect";
用户同意授权后，页面将跳转至 redirect_uri/?code=CODE&state=STATE

1.//通过code换取token  
 2.$code = $_GET['code'];  
 3.$url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=appid&secret=SECRET&code=$code&grant_type=authorization_code";  
 4.$json = file_get_contents($url);  
 5.$arr = json_decode($json,true);  
 6.$token = $arr['access_token'];  
 7.$openid = $arr['openid'];  
 8.//拿到token后就可以获取用户基本信息了  
 9.$url = "https://api.weixin.qq.com/sns/userinfo?access_token=$token&openid=$openid ";  
 10.$json = file_get_contents($url);//获取微信用户基本信息  
 11.$arr = json_decode($json,true);  
 12.$name = $arr['nickname'];//昵称  
 13.$imgURL = $arr['headimgurl'];//头像地址  
 14.$sex = $arr['sex'];//性别  
 15.$province = $arr['province'];//用户个人资料填写的省份  
 16.$city= $arr['city'];//普通用户个人资料填写的城市  
 17.$country= $arr['country'];//国家，如中国为CN