1、composer下载thinkphp5

composer create-project topthink/think [你的目录名] --prefer-dist

2、composer下载easywechat

composer require hooklife/thinkphp5-wechat

3、配置好小程序的appid和appsercret,还有证书

第一步： 
获取用户的openid

小程序代码

1. //app.js
2. App({
3. onLaunch: function() {
4. wx.login({
5. success: function (res) {
6. if (res.code) {
7. //发起网络请求获得openid
8. wx.request({
9. url: 'https://xxxxxxxx/index/on_login/index',
10. data: {
11. code: res.code
12. },
13. success:function(res){
14. //console.log(res.data.openid)
15. that.globalData.openId = res.data.openid
16. },
17. fail:function(e){
18. console.log(e);
19. }