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<button bindtap="login">登录</button>

<button bindtap="checksession">登录是否过期</button>

<button open-type="getUserInfo" bindgetuserinfo="info">点击授权</button>

<text>{{city}}</text>

<text>{{country}}</text>

<text>{{nickName}}</text>

<text>{{province}}</text>

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//index.js

//获取应用实例

const app = getApp()

Page({

 data: {

  city:'',

  country:'',

  nickName:'',

  province:''

 },

 //发起http请求

 login:function(){

  wx.login({

   success:function(res){

    console.log(res.code)

    //发送请求

    wx.request({

     url: '自己的域名', //仅为示例，并非真实的接口地址

     data: {

      code:res.code

     },

     header: {

      'content-type': 'application/json' // 默认值

     },

     success(res) {

      console.log(res)

     }

    })

   }

  })

 },

 //验证登录是否过期

 checksession:function(){

  wx.checkSession({

   success:function(res){

    console.log(res,'登录未过期')

    wx.showToast({

     title: '登录未过期啊',

    })

   },

   fail:function(res){

    console.log(res,'登录过期了')

    wx.showModal({

     title: '提示',

     content: '你的登录信息过期了，请重新登录',

    })

    //再次调用wx.login()

    wx.login({

     success: function (res) {

      console.log(res.code)

      //发送请求

      wx.request({

       url: '自己的域名', //仅为示例，并非真实的接口地址

       data: {

        code: res.code

       },

       header: {

        'content-type': 'application/json' // 默认值

       },

       success(res) {

        console.log(res)

       }

      })

     }

    })

   }

  })

 },

 //获取用户的信息

 info:function(){

  var that=this

  wx.getUserInfo({

   success:function(res){

    console.log(res.userInfo)

    var city = res.userInfo.city

    var country = res.userInfo.country

    var nickName = res.userInfo.nickName

    var province = res.userInfo.province

    that.setData({

     city:city,

     country:country,

     nickName:nickName,

     province:province

    })

   }

  })

 }

})

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<?php

//声明code，用来接收前台传过来的code

$code=$_GET['code'];

//获取到appid

$appid="xxxxxxxxxxx"; //自己的appid

$secret="xxxxxxxxxxxx";  //自己的secret

$api="https://api.weixin.qq.com/sns/jscode2session?appid={$appid}&secret={$secret}&js_code={$code}&grant_type=authorization_code";  //可去小程序开发文档中查看这个链接

//发送的代码

function httpGet($url){

    $curl=curl_init();

    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

    curl_setopt($curl, CURLOPT_TIMEOUT, 500);

    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);

    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, true);

    curl_setopt($curl, CURLOPT_URL, $url);

    $res= curl_exec($curl);

    curl_close($curl);

    return $res;

}

$str=httpGet($api);

echo $str;

?>