1.微信小程序登陆

关于后端：fastadmin加密生成token-CSDN博客

思路：

通过easywechat+fastadmin，

（1）== 用户端登陆（获取code） -> 请求后端接口获取session_key -> 用户端保存session_key

use EasyWeChat\Foundation\Application;
use EasyWeChat\Factory;


public function getSessionKey(){
        $code = $this->request->post('code');
        $config = [
            'app_id' => 'wx65ae3f41d0714e10',
            'secret' => 'e79ea0badcc0a4f1c549c55a530660cf',
            'token' => 'easywechat',
            'aes_key' => '......',

            'http' => [
                'throw'  => true, // 状态码非 200、300 时是否抛出异常，默认为开启
                'timeout' => 5.0,
                'retry' => true, // 使用默认重试配置
            ],
        ];
        $app = Factory::miniProgram($config); // 这个是小程序的
//        $app = Factory::officialAccount($config); // 这个是公众号的
        // 使用 SDK 中的相关功能来获取 session_key
        $data = $app->auth->session($code);
        $this->success('获取session_key成功', $data);
    }

此刻就获取到了：session_key（很重要）、openid。 

注意这里的this指向。

// 前端uniapp
getSessionKey() {
				var that = this
				uni.login({
					success(info) {
						console.log('login信息', info)
						var postData = {
							code: info.code
						}
						getApp().posturl('Wechat/getSessionKey', postData).then(res => {
							console.log(res)
							that.session_key = res.data.session_key
							console.log('========',that.session_key)
						});
					}
				})
			}

2.微信小程序授权用户信息

用户端获取用户信息（获取 iv + encryptedData + signature + session_key ）-> 请求后端接口获取token -> 用户端保存token （可以控制时间）

public function getUserInfo(){
        // 获取得到avatarUrl、nickName、openId，进行存储
        $data = $this -> app -> encryptor->decryptData($this -> post['session_key'], $this -> post['iv'], $this -> post['encryptedData']);
        $userModel = new HcdrspUser();
        $result = $userModel->where('openid', $data['openId'])->find();
        if($result){
            $this->success('获取用户信息成功', $data);
        }else{
            $userModel->openid = $data['openId'];
            $userModel->avatarUrl = $data['avatarUrl'];
            $userModel->name = $data['nickName'];
            // 创建时间
            $userModel->createtime = time();
            $userModel->save();
            $this->success('欢迎新用户', $data);
        }
    }

getuserinfo(e){
				console.log('getuserinfo用户信息',e);
				console.log('session_key信息',this.session_key);
				var postData = {
					iv: e.detail.iv,
					encryptedData:e.detail.encryptedData,
					session_key: this.session_key
				}
				getApp().posturl('Wechat/getUserInfo', postData).then(res => {
					console.log(res)
					this.avatarUrl = res.data.avatarUrl
					this.nickName = res.data.avatarUrl
					let openId = res.data.openId
					uni.setStorageSync('openId',openId)
				});
			},

3. 微信小程序获取手机号

前端：

<button open-type="getPhoneNumber" @getphonenumber="onGetPhoneNumber">授权并获取手机号</button>

onGetPhoneNumber(e){
				if(this.nickName === ''){
					uni.showToast({
						icon:'none',
						title:'请先登陆'
					})
					return
				}
				console.log('getPhoneNumber用户信息',e);
				console.log('session_key信息',this.session_key);
				var postData = {
					iv: e.detail.iv,
					encryptedData:e.detail.encryptedData,
					session_key: this.session_key
				}
				getApp().posturl('Wechat/getPhoneNumber', postData).then(res => {
					console.log(res)
					this.phoneNumber = res.data.phoneNumber
				});
			},

后端：

/*
     * 获取手机号
     */
    public function getPhoneNumber(){
        $data = $this -> app -> encryptor->decryptData($this -> post['session_key'], $this -> post['iv'], $this -> post['encryptedData']);
        $userModel = new HcdrspUser();
        $result = $userModel->where('phone', $data['phoneNumber'])->find();
        if($result){
            $this->success('已存在手机号', $data);
        }else{
            $userModel->phone = $data['phoneNumber'];
            $userModel->save();

            $this->success('获取手机号成功', $data);
        }
    }