CODING

<?php
/**
 * 微信接口获取/code/access_token/userinfo测试
 * 1、引导用户进入授权页面同意授权，获取code
 * 2、通过code换取网页授权access_token,openid（与基础支持中的access_token不同）
 * 3、通过网页授权access_token和openid获取用户基本信息userinfo（支持UnionID机制）
 */

    $appid = "wxb0ecfdea8055XXXX";
    $secret = "102c519025101e19d74fa4c884b4XXXX";
    $redirect_uri = "http://m.XXXX.com/xxxx.php";
    $scope = "snsapi_base";

/*1、引导用户进入授权页面同意授权，获取code*/
/*code <= appid,redirect_uri[与后台设置需要一致],scope[snsapi_base]*/
    $url_code = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=$appid&redirect_uri=$redirect_uri&response_type=code&scope=$scope&state=1#wechat_redirect";
    if(empty($_GET['code'])){
        //跳转到$url_code,会带一个code参数跳转回来
        header("Location:$url_code");
    }else{
        $code = $_GET['code'];
    }
/*2、通过code换取网页授权access_token,openid（与基础支持中的access_token不同）*/
/*access_token,openid <= appid,secret,code*/
    $url_access_token = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=$appid&secret=$secret&code=$code&grant_type=authorization_code";
    $json_access_token = file_get_contents($url_access_token);
    $arr_access_token = json_decode($json_access_token,TRUE);
    $access_token = $arr_access_token['access_token']; 
    $openid = $arr_access_token['openid'];
/*3、通过网页授权access_token和openid获取用户基本信息userinfo（支持UnionID机制）*/
/*userinfo <= access_token,openid*/
    $url_userinfo = "https://api.weixin.qq.com/sns/userinfo?access_token=$access_token&openid=$openid&lang=zh_CN";
    $json_userinfo = file_get_contents($url_userinfo);
    $arr_userinfo = json_decode($json_userinfo,TRUE);
/* 
    arr_userinfo返回值:
    ["openid"]=>"oy3SMtwGXXXXnuLr7hr2l4"
    ["nickname"]=>"天天天晴_2014"
    ["sex"]=>int(1)
    ["language"]=>"zh_CN"
    ["city"]=>"东莞"
    ["province"]=>"广东"
    ["country"]=>"中国"
    ["headimgurl"]=>"http://wx.qlogo.cn/mmopen/SicNOemw9NjtgucsSTVDia1ktXXXX0qvibu057GkvUtFThKAKzb9zgYzOXQlNcD4ZTBCvGXXcibrehSEiceNWwicNJEXXrfrJicVg/0"
    ["privilege"]=>array(0) {}
*/
?>

参考:

微信_公众平台开发者文档:http://mp.weixin.qq.com/wiki/17/c0f37d5704f0b64713d5d2c37b468d75.html

微信公众号开发_如何获取用户信息?