首先根据code授权登录获取openid和session_key入库

      public function login(Request $request)
        {
            $code = $request->input('code');
            $url = sprintf(config('wechat.wx_url'),config('wechat.appid'),config('wechat.secret'),$code);
            $res = (new Curl())->getUrl($url);
            $bool = UserModel::where('openid',$res['openid'])->first();
            if ($bool){
                   $jwt = (new Token())->createToken($bool['id']);
                   UserModel::where('id',$bool['id'])->update(['session_key'=>$res['session_key']]);
                   return $this->ok($bool,$jwt,'登录成功');
            }
            $arr = [
              'openid'=>$res['openid'],
              'session_key'=>$res['session_key'],
               'img_url'=>$request['img_url'],
               'nickname'=>$request['nickname']
            ];
            $adds = UserModel::create($arr,true);
            $jwt = (new Token())->createToken($adds['id']);
            return $this->ok($adds,$jwt,'注册成功');
        }

根据session_key 解密手机号

 public function getPhoneNumber(Request $request)
        {
            $arr = UserModel::where('id',$request->uid)->first();
            $session_key = $arr['session_key'];
            $appid = config('wechat.appid');
            $encryptedData = $request->input('encryptedData');
            $iv = $request->input('iv');
            $pc = new WxBizDataCrypt($appid,$session_key);
            $errCode = $pc->decryptData($encryptedData, $iv, $data ); //调用封装解密手机号的方法
            $data = json_decode($data,true);
            if($errCode == 0){
                UserModel::where('id',$request->uid)->update(['phone'=>$data['phoneNumber']]);
                return ['code'=>200,'msg'=>'成功','data'=>$data['phoneNumber']];
            }else{
                return ['code'=>$errCode,'msg'=>'失败','data'=>''];
            }
        }

封装解密手机号类并继承报错信息 

<?php
namespace App\Server;

class WxBizDataCrypt extends ErrorCode
{
    private $appid;
    private $sessionKey;

    /**
     * 构造函数
     * @param $sessionKey string 用户在小程序登录后获取的会话密钥
     * @param $appid string 小程序的appid
     */
    public function __construct( $appid, $sessionKey)
    {
        $this->sessionKey = $sessionKey;
        $this->appid = $appid;
    }


    /**
     * 检验数据的真实性，并且获取解密后的明文.
     * @param $encryptedData string 加密的用户数据
     * @param $iv string 与用户数据一同返回的初始向量
     * @param $data string 解密后的原文
     *
     * @return int 成功0，失败返回对应的错误码
     */
    public function decryptData( $encryptedData, $iv, &$data )
    {
        if (strlen($this->sessionKey) != 24) {
            return ErrorCode::$IllegalAesKey;
        }
        $aesKey=base64_decode($this->sessionKey);


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

        $aesCipher=base64_decode($encryptedData);

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

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

}

报错信息

<?php
namespace App\Server;

class ErrorCode
{
    public static $OK = 0;
    public static $IllegalAesKey = -41001;
    public static $IllegalIv = -41002;
    public static $IllegalBuffer = -41003;
    public static $DecodeBase64Error = -41004;
}

注意点：授权获取手机号可能为报 - 41003 只需重新授权登录就能解决报错！！！