**CodeIgniter系列 添加filter和helper

filter:

使用CI的hooks来实现filter.

1.在system/application/config/config.php中，把enable_hooks的值改为TRUE

$config['enable_hooks'] = TRUE;

2.在syste/application/config/hooks.php中，添加hooks，如下

$hook['post_controller_constructor'] = array(
    'class'    => 'SecurityFilterChain',
    'function' => 'do_filter',
    'filename' => 'security_filter_chain.php',
    'filepath' => 'hooks',
    'params'   => array(
        'logged_in_session_attr' => 'logged_in',
        'login_page' => '/login/',
        'should_not_filter' => array('/^//login$/', '/^//login//.*$/', '/^//user//profile.*$/'),
        'need_admin_role' => array('/^//user$/', '/^//user//.*$/', '/^//role$/', '/^//role//.*$/')
        )
    );

其中params 是传递给filter类的参数.

shoud_not_filter是不需要过滤的uri

need_admin_role是需要管理员角色的uri

3.生成文件system/application/hooks/security_filter_chain.php

class SecurityFilterChain { 
    function do_filter($params) 
    { 
        $CI = &get_instance(); 
        $uri = uri_string();

foreach($params['should_not_filter'] as $not_filter)
        {
            if(preg_match($not_filter, $uri) == 1)
            {
                return;
            }
        }
 
        if(!$CI->session->userdata($params['logged_in_session_attr'])) 
        { 
            redirect($params['login_page']); 
        }
        
        foreach($params['need_admin_role'] as $need_admin)
        {
            if(preg_match($need_admin, $uri) == 1)
            {
                $current_user = $CI->session->userdata('current_user');
                if(!isset($current_user['role_status']) or $current_user['role_status'] != 0) ／／ 0表示管理员角色的id
                {
                    show_error('您没有权限访问这个页面', 403);
                    return;
                }
                break;
            }
        } 
 
    } 
}

helper

添加自定义的helper，名称为test

1.创建文件system/application/helpers/test_helper.php内容为：

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

if ( ! function_exists('array_to_option'))
{
    function array_to_option($name, $data = array())
    {
        $html = "<select name=/"$name/">";
        foreach($data as $value => $text)
        {
            $html .= "<option value=/"$value/">$text</option>";
        }
        $html .= "</select>";
        return $html;
    }
}

2.加载这个helper

在autoload.php里边，autoload['helper']中添加test

$autoload['helper'] = array('url', 'form', 'test');

或者在controller的构造函数中添加

$this->load->helper('test')

3.使用。直接调用函数array_to_option即可