在 mvc php 中验证

I don't know which one is the best? do you think it's better to validate user login form or other forms in controller or it's better to define one class for example 'security class' in model to validation? or define some classes for validation? do you know a better choice or good technique?

<?php
class acontroller{
.
.
.
private function loginformAction()
{
    $this->actionform='loginform';
    $this->errorMsg=array();
    if(isset($post)){
        if(empty($post('aliasName'))){
                       ...
        }else{
           ...
                    }
        if(empty($post('password'))){
                      ...
        }
        if(empty($post('re_password'))){
                      ...   
        }
        if(!empty($post('password')) && isset($post('re_password')) ){
                      ...
        }
    }

    $this->render();
}
  .
  .
  .
 }   

推荐答案

验证是域逻辑的一部分.控制器应该与此无关.它只需要将传入的请求值传递给模型层的适当部分.