顾名思义，装载器就是加载元素的，使用CI时，经常加载的有：

加载类库文件：$this->load->library()

加载视图文件：$this->load->view()

加载模型文件：$this->load->model()

加载数据库文件：$this->load->database()

加载帮助文件：$this->load->helper()

加载配置文件：$this->load->config()

加载包路径：$this->load->add_package_path()

源码：

1 /**2 * Loader Class3 *4 * 用户加载views和files，常见的函数有model(),view(),library(),helper()5 *6 * Controller的好助手，$this->load =& load_class('Loader', 'core');，加载了loader，Controller就无比强大了7 * @link http://www.phpddt.com8  */
9 classCI_Loader {10
11     protected $_ci_ob_level;12
13     protected $_ci_view_paths        = array();14     protected $_ci_library_paths    = array();15     protected $_ci_model_paths        = array();16     protected $_ci_helper_paths        = array();17
18     protected $_base_classes        = array(); //Set by the controller class
19
20     protected $_ci_cached_vars        = array();21
22     protected $_ci_classes            = array();23
24     protected $_ci_loaded_files        = array();25
26     protected $_ci_models            = array();27
28     protected $_ci_helpers            = array();29
30     protected $_ci_varmap            = array('unit_test' => 'unit',
31                                             'user_agent' => 'agent');32
33     public function__construct()34 {35                 //获取缓冲嵌套级别
36         $this->_ci_ob_level  = ob_get_level();37         //library路径
38                 $this->_ci_library_paths = array(APPPATH,BASEPATH);39                 //helper路径
40         $this->_ci_helper_paths = array(APPPATH,BASEPATH);41                 //model路径
42         $this->_ci_model_paths = array(APPPATH);43                 //view路径
44         $this->_ci_view_paths = array(APPPATH.'views/'    => TRUE);45
46         log_message('debug', "Loader Class Initialized");47 }48
49     //--------------------------------------------------------------------
50
51     /**52 * 初始化Loader53 *54      */
55     public functioninitialize()56 {57         $this->_ci_classes = array();58         $this->_ci_loaded_files = array();59         $this->_ci_models = array();60                 //将is_loaded（common中记录加载核心类函数）加载的核心类交给_base_classes
61         $this->_base_classes =&is_loaded();62
63                 //加载autoload.php配置中文件
64         $this->_ci_autoloader();65
66         return $this;67 }68
69     //--------------------------------------------------------------------
70
71     /**72 * 检测类是否加载73      */
74     public function is_loaded($class)75 {76         if (isset($this->_ci_classes[$class]))77 {78             return $this->_ci_classes[$class];79 }80
81         return FALSE;82 }83
84     //--------------------------------------------------------------------
85
86     /**87 * 加载Class88      */
89     public function library($library = '', $params = NULL, $object_name = NULL)90 {91         if (is_array($library))92 {93             foreach ($library as $class)94 {95                 $this->library($class, $params);96 }97
98             return;99 }100
101                 //如果$library为空或者已经加载。。。
102         if ($library == '' OR isset($this->_base_classes[$library]))103 {104             return FALSE;105 }106
107         if ( ! is_null($params) && ! is_array($params))108 {109             $params = NULL;110 }111
112         $this->_ci_load_class($library, $params, $object_name);113 }114
115     //--------------------------------------------------------------------
116
117     /**118 * 加载和实例化model119      */
120     public function model($model, $name = '', $db_conn = FALSE)121 {122                 //CI支持数组加载多个model
123         if (is_array($model))124 {125             foreach ($model as $babe)126 {127                 $this->model($babe);128 }129             return;130 }131
132         if ($model == '')133 {134             return;135 }136
137         $path = '';138
139         //是否存在子目录
140         if (($last_slash = strrpos($model, '/')) !== FALSE)141 {142             //The path is in front of the last slash
143             $path = substr($model, 0, $last_slash + 1);144
145             //And the model name behind it
146             $model = substr($model, $last_slash + 1);147 }148
149         if ($name == '')150 {151             $name = $model;152 }153
154         if (in_array($name, $this->_ci_models, TRUE))155 {156             return;157 }158
159         $CI =&get_instance();160         if (isset($CI->$name))161 {162             show_error('The model name you are loading is the name of a resource that is already being used: '.$name);163 }164
165         $model = strtolower($model); //model文件名全小写
166
167         foreach ($this->_ci_model_paths as $mod_path)168 {169             if ( ! file_exists($mod_path.'models/'.$path.$model.'.php'))170 {171                 continue;172 }173
174             if ($db_conn !== FALSE AND ! class_exists('CI_DB'))175 {176                 if ($db_conn === TRUE)177 {178                     $db_conn = '';179 }180
181                 $CI->load->database($db_conn, FALSE, TRUE);182 }183
184             if ( ! class_exists('CI_Model'))185 {186                 load_class('Model', 'core');187 }188
189             require_once($mod_path.'models/'.$path.$model.'.php');190
191             $model = ucfirst($model);192
193             $CI->$name = new $model();194                         //保存在Loader::_ci_models中，以后可以用它来判断某个model是否已经加载过。
195             $this->_ci_models[] = $name;196             return;197 }198
199         //couldn't find the model
200         show_error('Unable to locate the model you have specified: '.$model);201 }202
203     //--------------------------------------------------------------------
204
205     /**206 * 数据库Loader207      */
208     public function database($params = '', $return = FALSE, $active_record = NULL)209 {210         //Grab the super object
211         $CI =&get_instance();212
213         //是否需要加载db
214         if (class_exists('CI_DB') AND $return == FALSE AND $active_record == NULL AND isset($CI->db) AND is_object($CI->db))215 {216             return FALSE;217 }218
219         require_once(BASEPATH.'database/DB.php');220
221         if ($return === TRUE)222 {223             return DB($params, $active_record);224 }225
226         //Initialize the db variable.  Needed to prevent227 // reference errors with some configurations
228         $CI->db = '';229
230         //Load the DB class
231         $CI->db =& DB($params, $active_record);232 }233
234     //--------------------------------------------------------------------
235
236     /**237 * 加载数据库工具类238      */
239     public functiondbutil()240 {241         if ( ! class_exists('CI_DB'))242 {243             $this->database();244 }245
246         $CI =&get_instance();247
248         //for backwards compatibility, load dbforge so we can extend dbutils off it249 // this use is deprecated and strongly discouraged
250         $CI->load->dbforge();251
252         require_once(BASEPATH.'database/DB_utility.php');253         require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_utility.php');254         $class = 'CI_DB_'.$CI->db->dbdriver.'_utility';255
256         $CI->dbutil = new $class();257 }258
259     //--------------------------------------------------------------------
260
261     /**262 * Load the Database Forge Class263 *264 * @return    string265      */
266     public functiondbforge()267 {268         if ( ! class_exists('CI_DB'))269 {270             $this->database();271 }272
273         $CI =&get_instance();274
275         require_once(BASEPATH.'database/DB_forge.php');276         require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_forge.php');277         $class = 'CI_DB_'.$CI->db->dbdriver.'_forge';278
279         $CI->dbforge = new $class();280 }281
282     //--------------------------------------------------------------------
283
284     /**285 * 加载视图文件286      */
287     public function view($view, $vars = array(), $return = FALSE)288 {289         return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_object_to_array($vars), '_ci_return' => $return));290 }291
292     //--------------------------------------------------------------------
293
294     /**295 * 加载普通文件296      */
297     public function file($path, $return = FALSE)298 {299         return $this->_ci_load(array('_ci_path' => $path, '_ci_return' => $return));300 }301
302     //--------------------------------------------------------------------
303
304     /**305 * 设置变量306 *307 * Once variables are set they become available within308 * the controller class and its "view" files.309 *310      */
311     public function vars($vars = array(), $val = '')312 {313         if ($val != '' AND is_string($vars))314 {315             $vars = array($vars => $val);316 }317
318         $vars = $this->_ci_object_to_array($vars);319
320         if (is_array($vars) AND count($vars) > 0)321 {322             foreach ($vars as $key => $val)323 {324                 $this->_ci_cached_vars[$key] = $val;325 }326 }327 }328
329     //--------------------------------------------------------------------
330
331     /**332 * 检查并获取变量333      */
334     public function get_var($key)335 {336         return isset($this->_ci_cached_vars[$key]) ? $this->_ci_cached_vars[$key] : NULL;337 }338
339     //--------------------------------------------------------------------
340
341     /**342 * 加载helper343      */
344     public function helper($helpers = array())345 {346         foreach ($this->_ci_prep_filename($helpers, '_helper') as $helper)347 {348             if (isset($this->_ci_helpers[$helper]))349 {350                 continue;351 }352
353             $ext_helper = APPPATH.'helpers/'.config_item('subclass_prefix').$helper.'.php';354
355             //如果是扩展helper的话
356             if (file_exists($ext_helper))357 {358                 $base_helper = BASEPATH.'helpers/'.$helper.'.php';359
360                 if ( ! file_exists($base_helper))361 {362                     show_error('Unable to load the requested file: helpers/'.$helper.'.php');363 }364
365                 include_once($ext_helper);366                 include_once($base_helper);367
368                 $this->_ci_helpers[$helper] = TRUE;369                 log_message('debug', 'Helper loaded: '.$helper);370                 continue;371 }372
373             //如果不是扩展helper，helper路径中加载helper
374             foreach ($this->_ci_helper_paths as $path)375 {376                 if (file_exists($path.'helpers/'.$helper.'.php'))377 {378                     include_once($path.'helpers/'.$helper.'.php');379
380                     $this->_ci_helpers[$helper] = TRUE;381                     log_message('debug', 'Helper loaded: '.$helper);382                     break;383 }384 }385
386             //如果该helper还没加载成功的话，说明加载helper失败
387             if ( ! isset($this->_ci_helpers[$helper]))388 {389                 show_error('Unable to load the requested file: helpers/'.$helper.'.php');390 }391 }392 }393
394     //--------------------------------------------------------------------
395
396     /**397 * 可以看到helpers调用也是上面的helper,只是helpers的别名而已398      */
399     public function helpers($helpers = array())400 {401         $this->helper($helpers);402 }403
404     //--------------------------------------------------------------------
405
406     /**407 * 加载language文件408      */
409     public function language($file = array(), $lang = '')410 {411         $CI =&get_instance();412
413         if ( ! is_array($file))414 {415             $file = array($file);416 }417
418         foreach ($file as $langfile)419 {420             $CI->lang->load($langfile, $lang);421 }422 }423
424     //--------------------------------------------------------------------
425
426     /**427 * 加载配置文件428      */
429     public function config($file = '', $use_sections = FALSE, $fail_gracefully = FALSE)430 {431         $CI =&get_instance();432         $CI->config->load($file, $use_sections, $fail_gracefully);433 }434
435     //--------------------------------------------------------------------
436
437     /**438 * Driver439 *440 * 加载 driver library441      */
442     public function driver($library = '', $params = NULL, $object_name = NULL)443 {444         if ( ! class_exists('CI_Driver_Library'))445 {446             //we aren't instantiating an object here, that'll be done by the Library itself
447             require BASEPATH.'libraries/Driver.php';448 }449
450         if ($library == '')451 {452             return FALSE;453 }454
455         //We can save the loader some time since Drivers will *always* be in a subfolder,456 // and typically identically named to the library
457         if ( ! strpos($library, '/'))458 {459             $library = ucfirst($library).'/'.$library;460 }461
462         return $this->library($library, $params, $object_name);463 }464
465     //--------------------------------------------------------------------
466
467     /**468 * 添加 Package 路径469 *470 * 把package路径添加到库，模型，助手，配置路径471      */
472     public function add_package_path($path, $view_cascade=TRUE)473 {474         $path = rtrim($path, '/').'/';475
476         array_unshift($this->_ci_library_paths, $path);477         array_unshift($this->_ci_model_paths, $path);478         array_unshift($this->_ci_helper_paths, $path);479
480         $this->_ci_view_paths = array($path.'views/' => $view_cascade) + $this->_ci_view_paths;481
482         $config =& $this->_ci_get_component('config');483         array_unshift($config->_config_paths, $path);484 }485
486     //--------------------------------------------------------------------
487
488     /**489 * 获取Package Paths，默认不包含BASEPATH490      */
491     public function get_package_paths($include_base = FALSE)492 {493         return $include_base === TRUE ? $this->_ci_library_paths : $this->_ci_model_paths;494 }495
496     //--------------------------------------------------------------------
497
498     /**499 * 剔除Package Path500 *501 * Remove a path from the library, model, and helper path arrays if it exists502 * If no path is provided, the most recently added path is removed.503 *504      */
505     public function remove_package_path($path = '', $remove_config_path = TRUE)506 {507         $config =& $this->_ci_get_component('config');508
509         if ($path == '')510 {511             $void = array_shift($this->_ci_library_paths);512             $void = array_shift($this->_ci_model_paths);513             $void = array_shift($this->_ci_helper_paths);514             $void = array_shift($this->_ci_view_paths);515             $void = array_shift($config->_config_paths);516 }517         else
518 {519             $path = rtrim($path, '/').'/';520             foreach (array('_ci_library_paths', '_ci_model_paths', '_ci_helper_paths') as $var)521 {522                 if (($key = array_search($path, $this->{$var})) !== FALSE)523 {524                     unset($this->{$var}[$key]);525 }526 }527
528             if (isset($this->_ci_view_paths[$path.'views/']))529 {530                 unset($this->_ci_view_paths[$path.'views/']);531 }532
533             if (($key = array_search($path, $config->_config_paths)) !== FALSE)534 {535                 unset($config->_config_paths[$key]);536 }537 }538
539         //保证应用默认的路径依然存在
540         $this->_ci_library_paths = array_unique(array_merge($this->_ci_library_paths, array(APPPATH,BASEPATH)));541         $this->_ci_helper_paths = array_unique(array_merge($this->_ci_helper_paths, array(APPPATH,BASEPATH)));542         $this->_ci_model_paths = array_unique(array_merge($this->_ci_model_paths, array(APPPATH)));543         $this->_ci_view_paths = array_merge($this->_ci_view_paths, array(APPPATH.'views/' => TRUE));544         $config->_config_paths = array_unique(array_merge($config->_config_paths, array(APPPATH)));545 }546
547     //--------------------------------------------------------------------
548
549     /**550 * Loader551 *552 * This function is used to load views and files.553 * Variables are prefixed with _ci_ to avoid symbol collision with554 * variables made available to view files555 *556 * @param    array557 * @return    void558      */
559     protected function _ci_load($_ci_data)560 {561         //Set the default data variables
562         foreach (array('_ci_view', '_ci_vars', '_ci_path', '_ci_return') as $_ci_val)563 {564             $$_ci_val = ( ! isset($_ci_data[$_ci_val])) ? FALSE : $_ci_data[$_ci_val];565 }566
567         $file_exists = FALSE;568                 //如果$_ci_path不为空，则说明当前要加载普通文件。Loader::file才会有path
569         if ($_ci_path != '')570 {571             $_ci_x = explode('/', $_ci_path);572             $_ci_file = end($_ci_x);573 }574         else
575 {576             $_ci_ext = pathinfo($_ci_view,PATHINFO_EXTENSION);577             $_ci_file = ($_ci_ext == '') ? $_ci_view.'.php' : $_ci_view;578
579             foreach ($this->_ci_view_paths as $view_file => $cascade)580 {581                 if (file_exists($view_file.$_ci_file))582 {583                     $_ci_path = $view_file.$_ci_file;584                     $file_exists = TRUE;585                     break;586 }587
588                 if ( ! $cascade)589 {590                     break;591 }592 }593 }594                 //view文件不存在则会报错
595         if ( ! $file_exists && ! file_exists($_ci_path))596 {597             show_error('Unable to load the requested file: '.$_ci_file);598 }599
600         //把CI的所有属性都传递给loader，view中$this指的是loader
601         $_ci_CI =&get_instance();602         foreach (get_object_vars($_ci_CI) as $_ci_key => $_ci_var)603 {604             if ( ! isset($this->$_ci_key))605 {606                 $this->$_ci_key =& $_ci_CI->$_ci_key;607 }608 }609
610         /*
611 * Extract and cache variables612 *613 * You can either set variables using the dedicated $this->load_vars()614 * function or via the second parameter of this function. We'll merge615 * the two types and cache them so that views that are embedded within616 * other views can have access to these variables.617          */
618
619
620         if (is_array($_ci_vars))621 {622             $this->_ci_cached_vars = array_merge($this->_ci_cached_vars, $_ci_vars);623 }624
625         extract($this->_ci_cached_vars);626
627         /*
628 * 将视图内容放到缓存区629 *630          */
631         ob_start();632
633         //支持短标签
634         if ((bool) @ini_get('short_open_tag') === FALSE AND config_item('rewrite_short_tags') == TRUE)635 {636             echo eval('?>'.preg_replace("/;*\s*\?>/", "; ?>", str_replace('<?=', '<?php echo ', file_get_contents($_ci_path))));637 }638         else
639 {640             include($_ci_path); //include() vs include_once() allows for multiple views with the same name
641 }642
643         log_message('debug', 'File loaded: '.$_ci_path);644
645         //是否直接返回view数据
646         if ($_ci_return === TRUE)647 {648             $buffer = ob_get_contents();649             @ob_end_clean();650             return $buffer;651 }652
653         //当前这个视图文件是被另一个视图文件通过$this->view()方法引入，即视图文件嵌入视图文件
654         if (ob_get_level() > $this->_ci_ob_level + 1)655 {656
657             ob_end_flush();658 }659         else
660         {       ////把缓冲区的内容交给Output组件并清空关闭缓冲区。
661             $_ci_CI->output->append_output(ob_get_contents());662             @ob_end_clean();663 }664 }665
666     //--------------------------------------------------------------------
667
668     /**669 * 加载类670      */
671     protected function _ci_load_class($class, $params = NULL, $object_name = NULL)672 {673         //去掉.php和两端的/获取的$class就是类名或目录名+类名
674         $class = str_replace('.php', '', trim($class, '/'));675
676         //CI允许dir/filename方式
677         $subdir = '';678         if (($last_slash = strrpos($class, '/')) !== FALSE)679 {680             //目录
681             $subdir = substr($class, 0, $last_slash + 1);682
683             //文件名
684             $class = substr($class, $last_slash + 1);685 }686
687         //允许加载的类名首字母大写或全小写
688         foreach (array(ucfirst($class), strtolower($class)) as $class)689 {690             $subclass = APPPATH.'libraries/'.$subdir.config_item('subclass_prefix').$class.'.php';691
692             //是否是扩展类
693             if (file_exists($subclass))694 {695                 $baseclass = BASEPATH.'libraries/'.ucfirst($class).'.php';696
697                 if ( ! file_exists($baseclass))698 {699                     log_message('error', "Unable to load the requested class: ".$class);700                     show_error("Unable to load the requested class: ".$class);701 }702
703                 //Safety:  Was the class already loaded by a previous call?
704                 if (in_array($subclass, $this->_ci_loaded_files))705 {706                     //Before we deem this to be a duplicate request, let's see707 // if a custom object name is being supplied.  If so, we'll708 // return a new instance of the object
709                     if ( ! is_null($object_name))710 {711                         $CI =&get_instance();712                         if ( ! isset($CI->$object_name))713 {714                             return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);715 }716 }717
718                     $is_duplicate = TRUE;719                     log_message('debug', $class." class already loaded. Second attempt ignored.");720                     return;721 }722
723                 include_once($baseclass);724                 include_once($subclass);725                 $this->_ci_loaded_files[] = $subclass;726                                 //实例化类
727                 return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);728 }729
730             //如果不是扩展，和上面类似
731             $is_duplicate = FALSE;732             foreach ($this->_ci_library_paths as $path)733 {734                 $filepath = $path.'libraries/'.$subdir.$class.'.php';735
736                 //Does the file exist?  No?  Bummer...
737                 if ( ! file_exists($filepath))738 {739                     continue;740 }741
742                 //Safety:  Was the class already loaded by a previous call?
743                 if (in_array($filepath, $this->_ci_loaded_files))744 {745                     //Before we deem this to be a duplicate request, let's see746 // if a custom object name is being supplied.  If so, we'll747 // return a new instance of the object
748                     if ( ! is_null($object_name))749 {750                         $CI =&get_instance();751                         if ( ! isset($CI->$object_name))752 {753                             return $this->_ci_init_class($class, '', $params, $object_name);754 }755 }756
757                     $is_duplicate = TRUE;758                     log_message('debug', $class." class already loaded. Second attempt ignored.");759                     return;760 }761
762                 include_once($filepath);763                 $this->_ci_loaded_files[] = $filepath;764                 return $this->_ci_init_class($class, '', $params, $object_name);765 }766
767         } //END FOREACH768
769 // 如果还没有找到该class，最后的尝试是该class会不会在同名的子目录下
770         if ($subdir == '')771 {772             $path = strtolower($class).'/'.$class;773             return $this->_ci_load_class($path, $params);774 }775
776         //加载失败，报错
777         if ($is_duplicate == FALSE)778 {779             log_message('error', "Unable to load the requested class: ".$class);780             show_error("Unable to load the requested class: ".$class);781 }782 }783
784     //--------------------------------------------------------------------
785
786     /**787 * 实例化已经加载的类788      */
789     protected function _ci_init_class($class, $prefix = '', $config = FALSE, $object_name = NULL)790 {791         //是否有类的配置信息
792         if ($config === NULL)793 {794             //Fetch the config paths containing any package paths
795             $config_component = $this->_ci_get_component('config');796
797             if (is_array($config_component->_config_paths))798 {799                 //Break on the first found file, thus package files800 // are not overridden by default paths
801                 foreach ($config_component->_config_paths as $path)802 {803                     //We test for both uppercase and lowercase, for servers that804 // are case-sensitive with regard to file names. Check for environment805 // first, global next
806                     if (defined('ENVIRONMENT') AND file_exists($path .'config/'.ENVIRONMENT.'/'.strtolower($class).'.php'))807 {808                         include($path .'config/'.ENVIRONMENT.'/'.strtolower($class).'.php');809                         break;810 }811                     elseif (defined('ENVIRONMENT') AND file_exists($path .'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php'))812 {813                         include($path .'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php');814                         break;815 }816                     elseif (file_exists($path .'config/'.strtolower($class).'.php'))817 {818                         include($path .'config/'.strtolower($class).'.php');819                         break;820 }821                     elseif (file_exists($path .'config/'.ucfirst(strtolower($class)).'.php'))822 {823                         include($path .'config/'.ucfirst(strtolower($class)).'.php');824                         break;825 }826 }827 }828 }829
830         if ($prefix == '')831         {       //system下library
832             if (class_exists('CI_'.$class))833 {834                 $name = 'CI_'.$class;835 }836             elseif (class_exists(config_item('subclass_prefix').$class))837             {       //扩展library
838                 $name = config_item('subclass_prefix').$class;839 }840             else
841 {842                 $name = $class;843 }844 }845         else
846 {847             $name = $prefix.$class;848 }849
850         //Is the class name valid?
851         if ( ! class_exists($name))852 {853             log_message('error', "Non-existent class: ".$name);854             show_error("Non-existent class: ".$class);855 }856
857         //Set the variable name we will assign the class to858 // Was a custom class name supplied?  If so we'll use it
859         $class = strtolower($class);860
861         if (is_null($object_name))862 {863             $classvar = ( ! isset($this->_ci_varmap[$class])) ? $class : $this->_ci_varmap[$class];864 }865         else
866 {867             $classvar = $object_name;868 }869
870         //Save the class name and object name
871         $this->_ci_classes[$class] = $classvar;872
873         //将初始化的类的实例给CI超级句柄
874         $CI =&get_instance();875         if ($config !== NULL)876 {877             $CI->$classvar = new $name($config);878 }879         else
880 {881             $CI->$classvar = new $name;882 }883 }884
885     //--------------------------------------------------------------------
886
887     /**888 * 自动加载器889 *890 * autoload.php配置的自动加载文件有：891 *  | 1. Packages892 | 2. Libraries893 | 3. Helper files894 | 4. Custom config files895 | 5. Language files896 | 6. Models897      */
898     private function_ci_autoloader()899 {900         if (defined('ENVIRONMENT') AND file_exists(APPPATH.'config/'.ENVIRONMENT.'/autoload.php'))901 {902             include(APPPATH.'config/'.ENVIRONMENT.'/autoload.php');903 }904         else
905 {906             include(APPPATH.'config/autoload.php');907 }908
909         if ( ! isset($autoload))910 {911             return FALSE;912 }913
914         //自动加载packages,也就是将package_path加入到library，model，helper，config
915         if (isset($autoload['packages']))916 {917             foreach ($autoload['packages'] as $package_path)918 {919                 $this->add_package_path($package_path);920 }921 }922
923         //加载config文件
924         if (count($autoload['config']) > 0)925 {926             $CI =&get_instance();927             foreach ($autoload['config'] as $key => $val)928 {929                 $CI->config->load($val);930 }931 }932
933         //加载helper和language
934         foreach (array('helper', 'language') as $type)935 {936             if (isset($autoload[$type]) AND count($autoload[$type]) > 0)937 {938                 $this->$type($autoload[$type]);939 }940 }941
942         //这个好像是为了兼容以前版本的
943         if ( ! isset($autoload['libraries']) AND isset($autoload['core']))944 {945             $autoload['libraries'] = $autoload['core'];946 }947
948         //加载libraries
949         if (isset($autoload['libraries']) AND count($autoload['libraries']) > 0)950 {951             //加载db
952             if (in_array('database', $autoload['libraries']))953 {954                 $this->database();955                 $autoload['libraries'] = array_diff($autoload['libraries'], array('database'));956 }957
958             //加载所有其他libraries
959             foreach ($autoload['libraries'] as $item)960 {961                 $this->library($item);962 }963 }964
965         //Autoload models
966         if (isset($autoload['model']))967 {968             $this->model($autoload['model']);969 }970 }971
972     //--------------------------------------------------------------------
973
974     /**975 * 返回由对象属性组成的关联数组976      */
977     protected function _ci_object_to_array($object)978 {979         return (is_object($object)) ? get_object_vars($object) : $object;980 }981
982     //--------------------------------------------------------------------
983
984     /**985 * 获取CI某个组件的实例986      */
987     protected function &_ci_get_component($component)988 {989         $CI =&get_instance();990         return $CI->$component;991 }992
993     //--------------------------------------------------------------------
994
995     /**996 * 处理文件名，这个函数主要是返回正确文件名997      */
998     protected function _ci_prep_filename($filename, $extension)999 {1000         if ( ! is_array($filename))1001 {1002             return array(strtolower(str_replace('.php', '', str_replace($extension, '', $filename)).$extension));1003 }1004         else
1005 {1006             foreach ($filename as $key => $val)1007 {1008                 $filename[$key] = strtolower(str_replace('.php', '', str_replace($extension, '', $val)).$extension);1009 }1010
1011             return $filename;1012 }1013 }1014 }