1、直接上代码php

namespace Home\Controller;
use Think\Controller;
class ApiController extends Controller {
    /**
 * error code 说明.
 * 


 *    
-41001: encodingAesKey 非法
 *    
-41003: aes 解密失败
 *    
-41004: 解密后得到的buffer非法
 *    
-41005: base64加密失败
 *    
-41016: base64解密失败
 * 
 */
    public static $OK = 0;
    public static $IllegalAesKey = -41001;
    public static $IllegalIv = -41002;
    public static $IllegalBuffer = -41003;
    public static $DecodeBase64Error = -41004;
    // 小程序
    public static $appid = 'XXX';  //小程序appid
    public static $secret = 'XXX'; //小程序秘钥   

public $sessionKey ='';

    // 获取openId session-key 等
    public function getopenId($value='')
    {   

        $code = I('post.code');
        $appid = self::$appid;
        $secret = self::$secret;
        $url = 'https://api.weixin.qq.com/sns/jscode2session?appid='. $appid.'&secret='.$secret.'&js_code='.$code.'&grant_type=authorization_code';
        $result = httpGet($url);
        $res = json_decode($result);
        // session(['sessionKey'=>$res,'expire'=>7200]);
        $this->ajaxReturn($res);

        
    }

    // 获取小程序手机号api 接口，对应下面小程序 js
    public function getPhoneNumber($value='')
    {   

       $encryptedData = I('get.encryptedData');
       $iv = I('get.iv');
       $this->sessionKey=I('get.session_key');
       $res = $this->decryptData($encryptedData, $iv);
       // $res = json_decode($res);
       if($res->phoneNumber){
            // $res->phoneNumbe 就是手机号可以 写入数据库或者做其他操作
       }
       
       $this->ajaxReturn(['msg'=>$res,'status'=>'1']); //把手机号返回
        
    }

    // 小程序解密
   public function decryptData($encryptedData, $iv)
    {
        if (strlen($this->sessionKey) != 24) {
            return self::$IllegalAesKey;
        }
        $aesKey=base64_decode($this->sessionKey);

        
        if (strlen($iv) != 24) {
            return self::$IllegalIv;
        }
        $aesIV=base64_decode($iv);

        $aesCipher=base64_decode($encryptedData);

        $result=openssl_decrypt( $aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV);

        $dataObj=json_decode( $result );
        if( $dataObj  == NULL )
        {
            return self::$IllegalBuffer;
        }
        if( $dataObj->watermark->appid != self::$appid )
        {
            return self::$IllegalBuffer;
        }

        return  $dataObj;
        // return self::$OK;
    }


function httpGet($url) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_TIMEOUT, 500);
    // 为保证第三方服务器与微信服务器之间数据传输的安全性，所有微信接口采用https方式调用，必须使用下面2行代码打开ssl安全校验。
    // 如果在部署过程中代码在此处验证失败，请到 http://curl.haxx.se/ca/cacert.pem 下载新的证书判别文件。
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($curl, CURLOPT_URL, $url);

    $res = curl_exec($curl);
    curl_close($curl);

    return $res;
}


}

//2、小程序

2.1在app.js 启动页面里先login

// 登录
    // if (!wx.getStorageSync('session_key') || wx.getStorageSync('time') < Date.parse(new Date())){ // 判断session_key是不是存在获者过期
      wx.login({
        success: res => {
          console.log(res)
          // 发送 res.code 到后台换取 openId, sessionKey, unionId
          wx.request({
            url: 'https://www.zhixiaobing.com/index.php?m=&c=api&a=getopenId',
            header: { "Content-Type": "application/x-www-form-urlencoded" },
            method: 'post',
            data: { code: res.code },
            success: function (res) {
              console.log(res.data);
              wx.setStorageSync('openid', res.data.openid)
              wx.setStorageSync('session_key', res.data.session_key)
              wx.setStorageSync('time', parseInt(Date.parse(new Date())) + 7200)
            }
          })
          
        }
      })

//2.2 在小程序模板里写组件

//这是官方的组件点击会弹出授权页面

在js里写下面的函数

getPhoneNumber: function (e) {
    var that =this;

    var session_key = wx.getStorageSync('session_key')
    if (e.detail.errMsg == 'getPhoneNumber:fail user deny') {
      wx.showModal({
        title: '提示',
        showCancel: false,
        content: '未授权',
        success: function (res) { }
      })
    } else {//确认授权
      wx.request({
        url: 'https://www.showoow.com/index.php?m=mini&c=api&a=getPhoneNumber&openid=' + wx.getStorageSync('openid'), //openid是app.js 已经存的
        header: {"Content-Type": "application/x-www-form-urlencoded" },
        method: "get",
        data: {
          encryptedData: e.detail.encryptedData, iv: e.detail.iv, session_key:session_key
        },
        success:function(res){
          if (res.data.msg.phoneNumber){
            console.log(res);
            wx.showModal({
              title: '提示',
              showCancel: false,
              content: '授权成功',
              success: function () {
                wx.setStorageSync('phoneNumber', res.data.msg.phoneNumber);
                var time = Date.parse(new Date()) + 60 * 60 * 24 * 2
                wx.setStorageSync('exp', time );
              }
            })
            setTimeout(function(){
              wx.navigateTo({
                url: '/pages/form/form',
              })
            },1500);
            that.setData({
              show:'show',
              hiden:''
            })
          }else{
            wx.showToast({
              title: '授权失败',
              icon:'loading'
            })
          }
        
        },
        fail:function(){
          wx.showToast({
            title: '授权失败',
            icon: 'loading'
          })
        }
      })
     
    }
  },