1：在配置文件config中添加

'encryption_key'     =>'d441d33a65d31dbf0a8016a85c71a5b3',

2：在common文件中添加

//type 0:加密 1:解密
function encryption($value,$type=0){
  $key=config('encryption_key');
  if($type == 0){//加密
   return str_replace('=', '', base64_encode($value ^ $key));
  }else{
   $value=base64_decode($value);
   return $value ^ $key;
  }
}

3：在模型中加密代码

 public function login($data,$type=0){
    $userData=array();
    $userData['username']=trim($data['username']);
    $userData['password']=md5($data['password']);
    //验证用户名或邮箱或手机号是否存在
    $users=db('user')->where(array('username'=>$userData['username']))->whereOr(array('email'=>$userData['username']))->whereOr(array('mobile_phone'=>$userData['username']))->find();
    // dump($users); die;
    if($users){
      if($users['password'] == $userData['password']){
        session('uid',$users['id']);
        session('username',$users['username']);
        //写入会员等级及折扣率
        $points=$users['points'];
        $memberLevel=db('member_level')->where('bom_point','<=',$points)->where('top_point','>=',$points)->find();
        session('level_id',$memberLevel['id']);//等级id
        session('level_rate',$memberLevel['rate']);//等级折扣率
        //写入cookie
        if(isset($data['remember'])){
          $aMonth=30*24*60*60;
          $username=encryption($users['username'],0);
          $password=encryption($data['password'],0);
          cookie('username', $username, $aMonth, '/');
          cookie('password', $password, $aMonth, '/');
        }
        $arr=[
          'error'=>0,
          'message'=>"",
        ];
        if($type == 1){
          return $arr;
        }else{
          return json($arr);
        }
      }else{
        $arr=[
        'error'=>1,
        'message'=>"用户名或者密码错误",
        'url'=>'',
        ];
        if($type == 1){
          return $arr;
        }else{
          return json($arr);
        }
      }
    }else{
      $arr=[
      'error'=>1,
      'message'=>"用户名或者密码错误",
      'url'=>'',
      ];
      if($type == 1){
        return $arr;
      }else{
        return json($arr);
      }
    }
  }

4：在控制器中解密代码

 public function checkLogin(){
    $uid=session('uid');
    if($uid){
      $arr['error']=0;
      $arr['uid']=$uid;
      $arr['username']=session('username');
      return json($arr);
    }else{
      if(cookie('username') && cookie('password')){
        $data['username']=encryption(cookie('username'),1);
        $data['password']=encryption(cookie('password'),1);
        $loginRes=model('user')->login($data,1);
        if($loginRes['error'] == 0){
          $arr['error']=0;
          $arr['uid']=$uid;
          $arr['username']=session('username');
          return json($arr);
        }
      }
      $arr=array();
      $arr['error']=1;
      return json($arr);
    }
  }