CodeIgniter源码分析之Loader.php

来源:互联网 发布:女生用的吉他淘宝 编辑:程序博客网 时间:2024/05/22 09:44
<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');/** * Loader Class *  * Loader组件在CI里面也是一个很重要的组件,功能也比较明了。 * 如果已经阅读过Controller组件,会发现Controller组件的代码也只有十来行,但它却可以做很多事,一定程度上 * 要归功于Loader组件这个好助手或者好基友。 * 不过Loader组件的代码真的不少,主要以常用的几个方法以主线来探讨:model(),view(),library(),helper(); */class CI_Loader { // All these are set automatically. Don't mess with them. /**  * Nesting level of the output buffering mechanism  */ protected $_ci_ob_level; /**  * List of paths to load views from  */ protected $_ci_view_paths  = array(); /**  * List of paths to load libraries from  */ protected $_ci_library_paths = array(); /**  * List of paths to load models from  */ protected $_ci_model_paths  = array(); /**  * List of paths to load helpers from  */ protected $_ci_helper_paths  = array(); /**  * List of loaded base classes  */ protected $_base_classes  = array(); // Set by the controller class /**  * List of cached variables  */ protected $_ci_cached_vars  = array(); /**  * List of loaded classes  */ protected $_ci_classes   = array(); /**  * List of loaded files  */ protected $_ci_loaded_files  = array(); /**  * List of loaded models  */ protected $_ci_models   = array(); /**  * List of loaded helpers  */ protected $_ci_helpers   = array(); /**  * List of class name mappings  */ protected $_ci_varmap   = array('unit_test' => 'unit',           'user_agent' => 'agent'); /**  * Constructor  */ public function __construct() {  $this->_ci_ob_level  = ob_get_level();  $this->_ci_library_paths = array(APPPATH, BASEPATH);  $this->_ci_helper_paths = array(APPPATH, BASEPATH);  $this->_ci_model_paths = array(APPPATH);  $this->_ci_view_paths = array(APPPATH.'views/' => TRUE);  log_message('debug', "Loader Class Initialized"); } // -------------------------------------------------------------------- /**  * Initialize the Loader  */ public function initialize() {  $this->_ci_classes = array();  $this->_ci_loaded_files = array();  $this->_ci_models = array();    //这个is_loaded方法就是在core/Common.php中定义的全局函数,在Loader组件还没有加载之前,由它来负责记录  //哪些核心类已经加载过,现在Loader组件要加载了,就把信息交给Loader组件,保存在Loader::$_base_classes中。  $this->_base_classes =& is_loaded();  //自动加载,加载项是你在config/autoload.php中设置的。  $this->_ci_autoloader();  return $this; } // -------------------------------------------------------------------- /**  * Is Loaded  */ public function is_loaded($class) {  if (isset($this->_ci_classes[$class]))  {   return $this->_ci_classes[$class];  }  return FALSE; } // -------------------------------------------------------------------- /**  * Class Loader  * $library为相应的类名,$params为实例化此类的时候可能要用到的参数,$object_name为给这个类的实例自义定一个名字。  */ public function library($library = '', $params = NULL, $object_name = NULL) {  //如果是通过数组加载多个,把它拆开再调用本方法,其实它可以递归调用多维数组,不过没有这个必要。  if (is_array($library))  {   foreach ($library as $class)   {    $this->library($class, $params);   }   return;  }  //接下来两个if都是关于合法性的判断。  if ($library == '' OR isset($this->_base_classes[$library]))  {   return FALSE;  }  if ( ! is_null($params) && ! is_array($params))  {   $params = NULL;  }  //真正把类加载进来的是下面这个方法。  $this->_ci_load_class($library, $params, $object_name); } // -------------------------------------------------------------------- /**  * Model Loader  */ public function model($model, $name = '', $db_conn = FALSE) {  //可以以数组形式同时加载多个$model  if (is_array($model))  {   foreach ($model as $babe)   {    $this->model($babe);   }   return;  }  if ($model == '')  {   return;  }  $path = '';  //判断是否包含目录信息  if (($last_slash = strrpos($model, '/')) !== FALSE)  {   $path = substr($model, 0, $last_slash + 1);   $model = substr($model, $last_slash + 1);  }  //如果没有给当前model定义名字,则以$model本身作为名字。  if ($name == '')  {   $name = $model;  }  //如果已经加载过此model,直接退出本函数。  if (in_array($name, $this->_ci_models, TRUE))  {   return;  }  $CI =& get_instance();  //如果加载的model名字与之前加载过的类有冲突,则报错。  if (isset($CI->$name))  {   show_error('The model name you are loading is the name of a resource that is already being used: '.$name);  }  //model文件必段是全小写。  $model = strtolower($model);  foreach ($this->_ci_model_paths as $mod_path)  {   if ( ! file_exists($mod_path.'models/'.$path.$model.'.php'))   {    continue;   }   //如果要求同时连接数据库。则调用Loader::database()方法加载数据库类。   if ($db_conn !== FALSE AND ! class_exists('CI_DB'))   {    if ($db_conn === TRUE)    {     $db_conn = '';    }    $CI->load->database($db_conn, FALSE, TRUE);   }   //加载父类model。   if ( ! class_exists('CI_Model'))   {    load_class('Model', 'core');   }   //引入当前model   require_once($mod_path.'models/'.$path.$model.'.php');   //把文件名的第一个字母大写作为类名,规定的命名规范。   $model = ucfirst($model);   $CI->$name = new $model();   //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。   $this->_ci_models[] = $name;   return;  }  show_error('Unable to locate the model you have specified: '.$model); } // -------------------------------------------------------------------- /**  * Database Loader  */ public function database($params = '', $return = FALSE, $active_record = NULL) {  $CI =& get_instance();  if (class_exists('CI_DB') AND $return == FALSE AND $active_record == NULL AND isset($CI->db) AND is_object($CI->db))  {   return FALSE;  }  require_once(BASEPATH.'database/DB.php');  if ($return === TRUE)  {   return DB($params, $active_record);  }  $CI->db = '';  $CI->db =& DB($params, $active_record); } // -------------------------------------------------------------------- /**  * Load the Utilities Class  */ public function dbutil() {  if ( ! class_exists('CI_DB'))  {   $this->database();  }  $CI =& get_instance();  // for backwards compatibility, load dbforge so we can extend dbutils off it  // this use is deprecated and strongly discouraged  $CI->load->dbforge();  require_once(BASEPATH.'database/DB_utility.php');  require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_utility.php');  $class = 'CI_DB_'.$CI->db->dbdriver.'_utility';  $CI->dbutil = new $class(); } // -------------------------------------------------------------------- /**  * Load the Database Forge Class  */ public function dbforge() {  if ( ! class_exists('CI_DB'))  {   $this->database();  }  $CI =& get_instance();  require_once(BASEPATH.'database/DB_forge.php');  require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_forge.php');  $class = 'CI_DB_'.$CI->db->dbdriver.'_forge';  $CI->dbforge = new $class(); } // -------------------------------------------------------------------- /**  * Load View  *  * Loader::view();方法可以和Loader::file()方法一并来阅读,实质上它们都是调用了Loader::_ci_load();方法。  */ public function view($view, $vars = array(), $return = FALSE) {  return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_object_to_array($vars), '_ci_return' => $return)); } // -------------------------------------------------------------------- /**  * Load File  */ public function file($path, $return = FALSE) {  return $this->_ci_load(array('_ci_path' => $path, '_ci_return' => $return)); } // -------------------------------------------------------------------- /**  * Set Variables  */ public function vars($vars = array(), $val = '') {  if ($val != '' AND is_string($vars))  {   $vars = array($vars => $val);  }  $vars = $this->_ci_object_to_array($vars);  if (is_array($vars) AND count($vars) > 0)  {   foreach ($vars as $key => $val)   {    $this->_ci_cached_vars[$key] = $val;   }  } } // -------------------------------------------------------------------- /**  * Get Variable  */ public function get_var($key) {  return isset($this->_ci_cached_vars[$key]) ? $this->_ci_cached_vars[$key] : NULL; } // -------------------------------------------------------------------- /**  * Load Helper  */ public function helper($helpers = array()) {  //Loader::_ci_prep_filename()方法只是处理文件名,以返回正确的数组而已。  //默认helper的文件名是以_helper为后缀,所以参数可以不用写_helper后缀,当然写也不会出错,因为  //Loader::_ci_prep_filename()会帮你处理掉。  foreach ($this->_ci_prep_filename($helpers, '_helper') as $helper)  {   //如果已经加载过此helper,则跳过。   if (isset($this->_ci_helpers[$helper]))   {    continue;   }   //helper的扩展。并非只有类可以扩展,函数也提供了扩展。注意这里是在APPPATH下。   $ext_helper = APPPATH.'helpers/'.config_item('subclass_prefix').$helper.'.php';   //如果存在对些helper的扩展。   if (file_exists($ext_helper))   {    //先引入CI自带的helper,再引入我们写的扩展。    $base_helper = BASEPATH.'helpers/'.$helper.'.php';    if ( ! file_exists($base_helper))    {     show_error('Unable to load the requested file: helpers/'.$helper.'.php');    }    include_once($ext_helper);    include_once($base_helper);    $this->_ci_helpers[$helper] = TRUE;    log_message('debug', 'Helper loaded: '.$helper);    continue;//继续下一个helper的引入。   }   //如果没有扩展的话,则分别从APPPATH和BASEPATH,即应用目录和系统目录下找到相应的helper。   //Loader::_ci_helper_paths默认是APPPATH和BASEPATH两个目录。如果你要再添加新的目录路径,可以   //通过Loader::add_package_path()方法设置(model,library等同理)   foreach ($this->_ci_helper_paths as $path)   {    if (file_exists($path.'helpers/'.$helper.'.php'))    {     include_once($path.'helpers/'.$helper.'.php');     $this->_ci_helpers[$helper] = TRUE;     log_message('debug', 'Helper loaded: '.$helper);     break;    }   }   if ( ! isset($this->_ci_helpers[$helper]))   {    show_error('Unable to load the requested file: helpers/'.$helper.'.php');   }  } } // -------------------------------------------------------------------- /**  * Load Helpers  */ public function helpers($helpers = array()) {  $this->helper($helpers); } // -------------------------------------------------------------------- /**  * Loads a language file  */ public function language($file = array(), $lang = '') {  $CI =& get_instance();  if ( ! is_array($file))  {   $file = array($file);  }  foreach ($file as $langfile)  {   $CI->lang->load($langfile, $lang);  } } // -------------------------------------------------------------------- /**  * Loads a config file  */ //这里的config方法,实质是完完全全调用Config组件的load方法而已。 public function config($file = '', $use_sections = FALSE, $fail_gracefully = FALSE) {  $CI =& get_instance();  $CI->config->load($file, $use_sections, $fail_gracefully); } // -------------------------------------------------------------------- /**  * Driver  */ public function driver($library = '', $params = NULL, $object_name = NULL) {  if ( ! class_exists('CI_Driver_Library'))  {   require BASEPATH.'libraries/Driver.php';  }  if ($library == '')  {   return FALSE;  }  if ( ! strpos($library, '/'))  {   $library = ucfirst($library).'/'.$library;  }  return $this->library($library, $params, $object_name); } // -------------------------------------------------------------------- /**  * Add Package Path  */ public function add_package_path($path, $view_cascade=TRUE) {  $path = rtrim($path, '/').'/';  array_unshift($this->_ci_library_paths, $path);  array_unshift($this->_ci_model_paths, $path);  array_unshift($this->_ci_helper_paths, $path);  $this->_ci_view_paths = array($path.'views/' => $view_cascade) + $this->_ci_view_paths;  $config =& $this->_ci_get_component('config');  array_unshift($config->_config_paths, $path); } // -------------------------------------------------------------------- /**  * Get Package Paths  *  */ public function get_package_paths($include_base = FALSE) {  return $include_base === TRUE ? $this->_ci_library_paths : $this->_ci_model_paths; } // -------------------------------------------------------------------- /**  * Remove Package Path  */ public function remove_package_path($path = '', $remove_config_path = TRUE) {  $config =& $this->_ci_get_component('config');  if ($path == '')  {   $void = array_shift($this->_ci_library_paths);   $void = array_shift($this->_ci_model_paths);   $void = array_shift($this->_ci_helper_paths);   $void = array_shift($this->_ci_view_paths);   $void = array_shift($config->_config_paths);  }  else  {   $path = rtrim($path, '/').'/';   foreach (array('_ci_library_paths', '_ci_model_paths', '_ci_helper_paths') as $var)   {    if (($key = array_search($path, $this->{$var})) !== FALSE)    {     unset($this->{$var}[$key]);    }   }   if (isset($this->_ci_view_paths[$path.'views/']))   {    unset($this->_ci_view_paths[$path.'views/']);   }   if (($key = array_search($path, $config->_config_paths)) !== FALSE)   {    unset($config->_config_paths[$key]);   }  }  $this->_ci_library_paths = array_unique(array_merge($this->_ci_library_paths, array(APPPATH, BASEPATH)));  $this->_ci_helper_paths = array_unique(array_merge($this->_ci_helper_paths, array(APPPATH, BASEPATH)));  $this->_ci_model_paths = array_unique(array_merge($this->_ci_model_paths, array(APPPATH)));  $this->_ci_view_paths = array_merge($this->_ci_view_paths, array(APPPATH.'views/' => TRUE));  $config->_config_paths = array_unique(array_merge($config->_config_paths, array(APPPATH))); } // -------------------------------------------------------------------- /**  * Loader  */ protected function _ci_load($_ci_data) {  //这里相当于把数组里面的元素拆开成变量。  foreach (array('_ci_view', '_ci_vars', '_ci_path', '_ci_return') as $_ci_val)  {   $$_ci_val = ( ! isset($_ci_data[$_ci_val])) ? FALSE : $_ci_data[$_ci_val];  }  $file_exists = FALSE;  //当Loader::_ci_load()方法是通过Loader::file()调用的时候,则会有$_ci_path的值,如果是  //如果Loader::view()调用的话,则有$_ci_view的值。  //如果$_ci_path不为空,则说明当前要加载普通文件。  if ($_ci_path != '')  {   //普通文件。这里只是获得文件名,以便找不到报错时候只报文件名而已。   $_ci_x = explode('/', $_ci_path);   $_ci_file = end($_ci_x);  }  else  {   //视图文件。   //下面两行操作也是为了让外部可以通过xxx.php或者直接xxx的方式进行传参而已。   $_ci_ext = pathinfo($_ci_view, PATHINFO_EXTENSION);   $_ci_file = ($_ci_ext == '') ? $_ci_view.'.php' : $_ci_view;   foreach ($this->_ci_view_paths as $view_file => $cascade)   {    //从Loader::$_ci_view_paths中遍历视图文件,如果找到则退出。    //(默认仅有APPPATH/view/下,当然也可以通过Loader::add_package()方法设置)    if (file_exists($view_file.$_ci_file))    {     $_ci_path = $view_file.$_ci_file;     $file_exists = TRUE;     break;    }    //如果没有找到,会根据这个$cascade判断允不允许继续往下一个路径寻找视图文件。    if ( ! $cascade)    {     break;    }   }  }  //如果找不到文件(普通或视图都一样),则报错。  if ( ! $file_exists && ! file_exists($_ci_path))  {   show_error('Unable to load the requested file: '.$_ci_file);  }  //下面这个也很关键,其实视图文件里面的代码都是在属于Loader组件的,什么意思?  //你可以随便写一个视图文件,然后在里面写上var_dump($this);可以发现,这个$this,是指Loader。  //为什么会这样子呢?再往下面十几行代码的地方就说明了这一点。  //这里是把CI所有的属性都开放给Loader组件用,这样在视图文件里面就可以通过$this->xxx的方式调用控制器  //所有的东西。    $_ci_CI =& get_instance();  foreach (get_object_vars($_ci_CI) as $_ci_key => $_ci_var)  {   if ( ! isset($this->$_ci_key))   {    $this->$_ci_key =& $_ci_CI->$_ci_key;   }  }  //在这里把在控制器里面通过$this->load->view("xxx",$data);中的$data解开,这就是为什么可以在视图文件  //中可以用$data里面的变量的原因。其实还可以通过Loader::vars()方法,设置这些变量,它们会首先保存在  //Loader::$_ci_cached_vars中  if (is_array($_ci_vars))  {   $this->_ci_cached_vars = array_merge($this->_ci_cached_vars, $_ci_vars);  }  extract($this->_ci_cached_vars);  //我们在控制器中调用$this->load->view()方法,实质视图并没有马上输出来,而是先将它放到缓冲区。  ob_start();  //就是这个地方,下面if中有一句eval(xxxx)以及else中有include;而里面的xxxx正是我们要加载的视图文件,  //所以这就是为什么在视图文件里,var_dump($this),会告诉你当前这个$this是Loader组件,因为视图的代码都是相当于  //嵌入这个地方。  if ((bool) @ini_get('short_open_tag') === FALSE AND config_item('rewrite_short_tags') == TRUE)  {   echo eval('?>'.preg_replace("/;*\s*\?>/", "; ?>", str_replace('<?=', '<?php echo ', file_get_contents($_ci_path))));//'  }  else  {   include($_ci_path);   }    //经过上面的代码,我们的视图文件的内容已经放到了缓冲区了。  log_message('debug', 'File loaded: '.$_ci_path);  //一般情况下,$_ci_return都为FLASE,即不要求通过$this->load->view()返回输出内容,而是直接放到缓冲区静候处理;  //当然你也可以先拿出数据,在控制器里面处理一下,再输出,例如在控制器中  //$output=$this->load->view("x",$data,TRUE);,当为TRUE的时候,下面的代码就起作用了。  if ($_ci_return === TRUE)  {   $buffer = ob_get_contents();   @ob_end_clean();   return $buffer;  }  //下面这个很关键,因为有可能当前这个视图文件是被另一个视图文件通过$this->view()方法引入,即视图文件嵌入视图文件  //从而导致多了一层缓冲。  //为了保证缓冲内容最后交给Output处理时,缓冲级别只比Loader组件加载时多1(这个1就是最父层的视图文件引起的)  //这里必须先flush掉当前层视图引起的这次缓冲,以保证Output正常工作。  if (ob_get_level() > $this->_ci_ob_level + 1)  {   ob_end_flush();  }  else  {   //如果不是多1,则说明当前引入的视图文件就是直接在控制器里面引入的那个,而不是由某个视图文件再引入的。      //把缓冲区的内容交给Output组件并清空关闭缓冲区。   $_ci_CI->output->append_output(ob_get_contents());   @ob_end_clean();  } } // -------------------------------------------------------------------- /**  * Load class  */ protected function _ci_load_class($class, $params = NULL, $object_name = NULL) {  //去掉后缀.php,是为了方便外部可以通过xxx.php也可以通过xxx.php来传入类名。同时去掉两端的/。  $class = str_replace('.php', '', trim($class, '/'));  //因为CI允许通过"dir1/dir2/classname"的格式来组织和加载类,所以还要判断类名中是否包括这些目录信息。  $subdir = '';  if (($last_slash = strrpos($class, '/')) !== FALSE)  {   //目录部分   $subdir = substr($class, 0, $last_slash + 1);   //类名部分   $class = substr($class, $last_slash + 1);  }  //CI允许类文件以大写字母开头或者全小写,下面的遍历,就是在遍历这两种情况。  foreach (array(ucfirst($class), strtolower($class)) as $class)  {   $subclass = APPPATH.'libraries/'.$subdir.config_item('subclass_prefix').$class.'.php';   //是否有我们开发人员自己写的扩展当前类的扩展?如果有的话,把它加载进来。   if (file_exists($subclass))   {    //先加载父类。    $baseclass = BASEPATH.'libraries/'.ucfirst($class).'.php';    if ( ! file_exists($baseclass))    {     log_message('error', "Unable to load the requested class: ".$class);     show_error("Unable to load the requested class: ".$class);    }    if (in_array($subclass, $this->_ci_loaded_files))    {          if ( ! is_null($object_name))     {      $CI =& get_instance();      //我们加载的类最终都是加载给超级控制器的,如果超级控制器已经有的话,那么我们没必要加载。      //如果没有,则实例它并加载给控制器。,      if ( ! isset($CI->$object_name))      {       return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);      }     }     $is_duplicate = TRUE;     log_message('debug', $class." class already loaded. Second attempt ignored.");     return;    }    //加载类。    include_once($baseclass);    include_once($subclass);    //把已加载的类记录到Loader::_ci_loaded_files中。    $this->_ci_loaded_files[] = $subclass;    //调用Loader::_ci_init_class()方法进而实例化。    return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);   }   //如果是没有写扩展。方法和上面大致相同,最后都是通过调用Loader::_ci_init_class()方法进而实例化。     $is_duplicate = FALSE;   foreach ($this->_ci_library_paths as $path)   {    $filepath = $path.'libraries/'.$subdir.$class.'.php';    if ( ! file_exists($filepath))    {     continue;    }    if (in_array($filepath, $this->_ci_loaded_files))    {     if ( ! is_null($object_name))     {      $CI =& get_instance();      if ( ! isset($CI->$object_name))      {       return $this->_ci_init_class($class, '', $params, $object_name);      }     }     $is_duplicate = TRUE;     log_message('debug', $class." class already loaded. Second attempt ignored.");     return;    }    include_once($filepath);    $this->_ci_loaded_files[] = $filepath;    return $this->_ci_init_class($class, '', $params, $object_name);   }  } // END FOREACH  //其实正常的话,上面如果找到此类就找到,没找到就没有了。不过CI在会这里做最后的尝试。会不会是放到了一个同名的  //子目录下。  if ($subdir == '')  {   $path = strtolower($class).'/'.$class;   return $this->_ci_load_class($path, $params);  }    //没有找到就报错咯。  if ($is_duplicate == FALSE)  {   log_message('error', "Unable to load the requested class: ".$class);   show_error("Unable to load the requested class: ".$class);  } } // -------------------------------------------------------------------- //此方法是用于实例化已经把类文件include进来的类。 protected function _ci_init_class($class, $prefix = '', $config = FALSE, $object_name = NULL) {  // Is there an associated config file for this class?  Note: these should always be lowercase  if ($config === NULL)  {   // Fetch the config paths containing any package paths   $config_component = $this->_ci_get_component('config');   if (is_array($config_component->_config_paths))   {    // Break on the first found file, thus package files    // are not overridden by default paths    foreach ($config_component->_config_paths as $path)    {     // We test for both uppercase and lowercase, for servers that     // are case-sensitive with regard to file names. Check for environment     // first, global next     if (defined('ENVIRONMENT') AND file_exists($path .'config/'.ENVIRONMENT.'/'.strtolower($class).'.php'))     {      include($path .'config/'.ENVIRONMENT.'/'.strtolower($class).'.php');      break;     }     elseif (defined('ENVIRONMENT') AND file_exists($path .'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php'))     {      include($path .'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php');      break;     }     elseif (file_exists($path .'config/'.strtolower($class).'.php'))     {      include($path .'config/'.strtolower($class).'.php');      break;     }     elseif (file_exists($path .'config/'.ucfirst(strtolower($class)).'.php'))     {      include($path .'config/'.ucfirst(strtolower($class)).'.php');      break;     }    }   }  }  if ($prefix == '')  {   if (class_exists('CI_'.$class))   {    $name = 'CI_'.$class;   }   elseif (class_exists(config_item('subclass_prefix').$class))   {    $name = config_item('subclass_prefix').$class;   }   else   {    $name = $class;   }  }  else  {   $name = $prefix.$class;  }  // Is the class name valid?  if ( ! class_exists($name))  {   log_message('error', "Non-existent class: ".$name);   show_error("Non-existent class: ".$class);  }  // Set the variable name we will assign the class to  // Was a custom class name supplied?  If so we'll use it  $class = strtolower($class);  if (is_null($object_name))  {   $classvar = ( ! isset($this->_ci_varmap[$class])) ? $class : $this->_ci_varmap[$class];  }  else  {   $classvar = $object_name;  }  // Save the class name and object name  $this->_ci_classes[$class] = $classvar;  // Instantiate the class  $CI =& get_instance();  if ($config !== NULL)  {   $CI->$classvar = new $name($config);  }  else  {   $CI->$classvar = new $name;  } } // -------------------------------------------------------------------- /**  * Autoloader  *  * The config/autoload.php file contains an array that permits sub-systems,  * libraries, and helpers to be loaded automatically.  *  */ private function _ci_autoloader() {  if (defined('ENVIRONMENT') AND file_exists(APPPATH.'config/'.ENVIRONMENT.'/autoload.php'))  {   include(APPPATH.'config/'.ENVIRONMENT.'/autoload.php');  }  else  {   include(APPPATH.'config/autoload.php');  }  if ( ! isset($autoload))  {   return FALSE;  }  // Autoload packages  if (isset($autoload['packages']))  {   foreach ($autoload['packages'] as $package_path)   {    $this->add_package_path($package_path);   }  }  // Load any custom config file  if (count($autoload['config']) > 0)  {   $CI =& get_instance();   foreach ($autoload['config'] as $key => $val)   {    $CI->config->load($val);   }  }  // Autoload helpers and languages  foreach (array('helper', 'language') as $type)  {   if (isset($autoload[$type]) AND count($autoload[$type]) > 0)   {    $this->$type($autoload[$type]);   }  }  // A little tweak to remain backward compatible  // The $autoload['core'] item was deprecated  if ( ! isset($autoload['libraries']) AND isset($autoload['core']))  {   $autoload['libraries'] = $autoload['core'];  }  // Load libraries  if (isset($autoload['libraries']) AND count($autoload['libraries']) > 0)  {   // Load the database driver.   if (in_array('database', $autoload['libraries']))   {    $this->database();    $autoload['libraries'] = array_diff($autoload['libraries'], array('database'));   }   // Load all other libraries   foreach ($autoload['libraries'] as $item)   {    $this->library($item);   }  }  // Autoload models  if (isset($autoload['model']))  {   $this->model($autoload['model']);  } } // -------------------------------------------------------------------- /**  * Object to Array  *  * Takes an object as input and converts the class variables to array key/vals  *  */ protected function _ci_object_to_array($object) {  return (is_object($object)) ? get_object_vars($object) : $object; } // -------------------------------------------------------------------- /**  * Get a reference to a specific library or model  *  */ protected function &_ci_get_component($component) {  $CI =& get_instance();  return $CI->$component; } // -------------------------------------------------------------------- /**  * Prep filename  *  * This function preps the name of various items to make loading them more reliable.  *  */ protected function _ci_prep_filename($filename, $extension) {  if ( ! is_array($filename))  {   return array(strtolower(str_replace('.php', '', str_replace($extension, '', $filename)).$extension));  }  else  {   foreach ($filename as $key => $val)   {    $filename[$key] = strtolower(str_replace('.php', '', str_replace($extension, '', $val)).$extension);   }   return $filename;  } }}

原创粉丝点击