CI 配置验证规则

//判断表单域，提交表单显示对应的错误信息
      $this->load->library('form_validation');
      $config = array(
      array(
      'field' => 'username',
      'label' => '用户名',
      'rules' => 'trim|required|min_length[2]|max_length[12]'    //|xss_clean'
      ), //将用户名通过“xss_clean”函数处理去掉了有害数据。
      array(
      'field' => 'password',
      'label' => '密码',
      'rules' => 'trim|required|md5'
      ),
      array(
      'field' => 'passconf',
      'label' => '再次输入',
      'rules' => 'trim|required|md5|matches[password]'
      ),
      array(
      'field' => 'email',
      'label' => '邮箱',
      'rules' => 'trim|required|valid_email'
      )
      );

$this->form_validation->set_rules($config);

　　$bool = $this->form_validation->run();
      //-----------------------------------------------------------------------------------------------------
      // 第二种规则定义
      // $this->load->library('form_validation');
      // $this->form_validation->set_rules('username', '用户名', 'required|min_length[5]|max_length[12]');
      // $this->form_validation->set_rules('password', '密码', 'required|matches[passconf]');
      // $this->form_validation->set_rules('passconf', '再次输入', 'required');
      // $this->form_validation->set_rules('email', '邮箱', 'required|valid_email');
  　 //$bool = $this->form_validation->run();

//-----------------------------------------------------------------------------------------------------

单独生成一个    form_validation.php   文件，放到【application\config】文件夹下：

内容为：

　　<?php

/*
 * 配置验证规则
 */
$config = array(
    'zhuce' => array(
        array(
            'field' => 'username',
            'label' => '用户名',
            'rules' => 'trim|required|min_length[2]|max_length[12]|callback_username_check'    //|xss_clean'
        ), //将用户名通过“xss_clean”函数处理去掉了有害数据。
        array(
            'field' => 'password',
            'label' => '密码',
            'rules' => 'trim|required|md5'
        ),
        array(
            'field' => 'passconf',
            'label' => '再次输入',
            'rules' => 'trim|required|md5|matches[password]'
        ),
        array(
            'field' => 'email',
            'label' => '邮箱',
            'rules' => 'trim|required|valid_email'
        )
    ),
    'login' => array(
        array(
            'field' => 'username',
            'label' => '用户名',
            'rules' => 'trim|required|min_length[2]|max_length[12]'    //|xss_clean'
        ), //将用户名通过“xss_clean”函数处理去掉了有害数据。
        array(
            'field' => 'password',
            'label' => '密码',
            'rules' => 'trim|required|md5'
        )
    )
);

调用时：

　　 $this->load->library('form_validation');
        $bool = $this->form_validation->run('login');
        if ($bool == FALSE) {
　　　   //　返回到注册页面　

　}else{

　　　　//验证没有问题

　　}