微信的登陆流程是这样的

首先前端发送请求到服务器：

wx.login({        success: function (res) {          var code = res.code;//发送给服务器的code          wx.getUserInfo({            success: function (res) {              var userNick = res.userInfo.nickName;//用户昵称              var avataUrl = res.userInfo.avatarUrl;//用户头像地址              var gender = res.userInfo.gender;//用户性别              if (code) {                wx.request({                  url: 'http://localhost/test/getopenid.php',//服务器的地址，现在微信小程序只支持https请求，所以调试的时候请勾选不校监安全域名                  data: {                    code: code,                    nick: userNick,                    avaurl: avataUrl,                    sex: gender,                  },                  header: {                    'content-type': 'application/json'                  },                  success: function (res) {                    console.log(res.data);                    wx.setStorageSync('name', res.data.name);//将获取信息写入本地缓存                    wx.setStorageSync('openid', res.data.openid);                    wx.setStorageSync('imgUrl', res.data.imgurl);                    wx.setStorageSync('sex', res.data.sex);                  }                })              }              else {                console.log("获取用户登录态失败！");              }            }          })        },        fail: function (error) {          console.log('login failed ' + error);        }})    
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这样就实现了将前端获取的code发送到服务器，code每次获取的都不一样；

服务器getopenid.php代码：

?phptext();function text(){    $code = $_GET['code'];//小程序传来的code值    $nick = $_GET['nick'];//小程序传来的用户昵称    $imgUrl = $_GET['avaurl'];//小程序传来的用户头像地址    $sex = $_GET['sex'];//小程序传来的用户性别    $url = 'https://api.weixin.qq.com/sns/jscode2session?appid=yourAppid&secret=appSecret&js_code=' . $code . '&grant_type=authorization_code';    //yourAppid为开发者appid.appSecret为开发者的appsecret,都可以从微信公众平台获取；    $info = file_get_contents($url);//发送HTTPs请求并获取返回的数据，推荐使用curl    $json = json_decode($info);//对json数据解码    $arr = get_object_vars($json);    $openid = $arr['openid'];    $session_key = $arr['session_key'];    $con = mysqli_connect('localhost', 'root', '123');//连接数据库    if ($con) {        if (mysqli_select_db($con, 'students')) {            $sql1 = "select * from weixin where openid = '$openid'";            $result = mysqli_query($con, $sql1);            $result = mysqli_fetch_assoc($result);            if ($result!=null) {//如果数据库中存在此用户的信息，则不需要重新获取                $result = json_encode($result);                echo $result;            }            else {//没有则将数据存入数据库                if ($sex == '0') {                    $sex = 'none';                } else {                    $sex = '1' ? 'man' : 'women';                }                $sql = "insert into weixin values ('$nick','$openid','$session_key','$imgUrl','$sex')";                if (mysqli_query($con, $sql)) {                    $arr['nick'] = $nick;                    $arr['imgUrl'] = $imgUrl;                    $arr['sex'] = $sex;                    $arr = json_encode($arr);                    echo $arr;                } else {                    die('failed' . mysqli_error($con));                }            }        }    } else {        die(mysqli_error());    }}?
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