让Codeigniter控制器支持多级目录

<?php
if (!defined('BASEPATH')) {  exit ('No direct script access allowed');}
class MY_Router extends CI_Router {
        public function __construct() {
                 parent :: __construct();
                 $this->agent=load_class('user_agent');
                 //$this->directory='mobile/';
                 if ($this->agent->is_mobile()) {
                        $this->directory='mobile/';
                }  

        }
        function set_directory($dir) {
                $this->directory =  $this->directory.$dir . '/';
        }
        function _validate_request($segments) {
                if (count($segments) == 0) {
                        return $segments;
                }
                if (file_exists(APPPATH . 'controllers/'.$this->fetch_directory() . $segments[0] . '.php')) {
                        return $segments;
                }
                if (is_dir(APPPATH . 'controllers/' .$this->fetch_directory(). $segments[0])) {
                        $temp = array (
                                'dir' => '',
                                'number' => 0,
                                'path' => ''
                        );
                        $temp['number'] = count($segments) - 1;

                        for ($i = 0; $i <= $temp['number']; $i++) {
                                $temp['path'] .= $segments[$i] . '/';

                                if (is_dir(APPPATH . 'controllers/' . $temp['path'])) {
                                        $temp['dir'][] = str_replace(array (
                                                '/',
                                                '.'
                                        ), '', $segments[$i]);
                                }
                        }
                        $this->set_directory(implode('/', $temp['dir']));
                        $segments = array_diff($segments, $temp['dir']);
                        $segments = array_values($segments);
                        unset ($temp);

                        if (count($segments) > 0) {
                                if (!file_exists(APPPATH . 'controllers/' . $this->fetch_directory() . $segments[0] . '.php')) {
                                        if (!empty ($this->routes['404_override'])) {
                                                $x = explode('/', $this->routes['404_override']);
                                                $this->set_directory('');
                                                $this->set_class($x[0]);
                                                $this->set_method(isset ($x[1]) ? $x[1] : 'index');
                                                return $x;
                                        } else {
                                                show_404($this->fetch_directory() . $segments[0]);
                                        }
                                }
                        } else {
                                if (strpos($this->default_controller, '/') !== FALSE) {
                                        $x = explode('/', $this->default_controller);
                                        $this->set_class($x[0]);
                                        $this->set_method($x[1]);
                                } else {
                                        $this->set_class($this->default_controller);
                                        $this->set_method('index');
                                }
                                if (!file_exists(APPPATH . 'controllers/' . $this->fetch_directory() . $this->default_controller . '.php')) {
                                        $this->directory = '';
                                        return array ();
                                }

                        }
                        return $segments;
                }
                if (!empty ($this->routes['404_override'])) {
                        $x = explode('/', $this->routes['404_override']);
                        $this->set_class($x[0]);
                        $this->set_method(isset ($x[1]) ? $x[1] : 'index');
                        return $x;
                }
                show_404($segments[0]);
        }
}

使用方法：把上面的代码另存为MY_Router.php,放在你应用目录的core目录下。假设你的应用放在application目录,哪么你把MY_Router.php文件放在application/core目录下即可：

原生的CI最多只支持一级目录,地址如下：controllers/directory/appname.php,现在你可以写成controllers/directory/directory/directory/appname.php,如果你不觉得累写多少都没关系 (^0^)。

现目前在Codeigniter 2.1.0、Codeigniter 2.1.1、Codeigniter 2.1.2都测试通过！