php不同用户跳转不同页面

// 登录
public function login()
{
 //密码加密并从数据库查找记录
 $map['username'] = input('post.a');
 $map['password'] = md5(input('post.b'));
 $user=db('user')->where($where)->find();
 //验证成功则保存session
 if ($user) {
 unset($user["psd"]);
 session("user", $user['id']);
 //根据不同权限跳转
 if($user['quanxian'] == 0){
 $this->redirect('Module1/index/index');
 }
 elseif ($user['quanxian'] == 1) {
 $this->redirect('MOdule2/index/index');
 }
 else{
 $this->redirect('Module3/index/index');
 }
 }else{
 print_r ('error!');
 return false;
 }
}