<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.1.6 or newer
*
* @package CodeIgniter
* @author ExpressionEngine Dev Team
* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
* @license http://codeigniter.com/user_guide/license.html
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* Loader Class
* 装载机类
*
* Loads views and files
* 负载的意见和文件
*
* @package CodeIgniter
* @subpackage Libraries
* @author ExpressionEngine Dev Team
* @category Loader
* @link http://codeigniter.com/user_guide/libraries/loader.html
*/
class CI_Loader {
// All these are set automatically. Don't mess with them.
// 所有这些都自动设置。不要惹他们。
/**
* Nesting level of the output buffering mechanism
* 嵌套级别的输出缓冲机制
*
* @var int
* @access protected
*/
protected $_ci_ob_level;
/**
* List of paths to load views from
* 的路径列表加载意见
* @var array
* @access protected
*/
protected $_ci_view_paths = array();
/**
* List of paths to load libraries from
* 加载库的路径列表
* @var array
* @access protected
*/
protected $_ci_library_paths = array();
/**
* List of paths to load models from
* 加载模型的路径列表
* @var array
* @access protected
*/
protected $_ci_model_paths = array();
/**
* List of paths to load helpers from
* 加载佣工的路径列表
* @var array
* @access protected
*/
protected $_ci_helper_paths = array();
/**
* List of loaded base classes
* Set by the controller class
* 列表的加载基类
* 设置控制器类
*
* @var array
* @access protected
*/
protected $_base_classes = array(); // Set by the controller class
/**
* List of cached variables
* 缓存变量列表
* @var array
* @access protected
*/
protected $_ci_cached_vars = array();
/**
* List of loaded classes
* 加载的类列表
* @var array
* @access protected
*/
protected $_ci_classes = array();
/**
* List of loaded files
* 加载的文件列表
* @var array
* @access protected
*/
protected $_ci_loaded_files = array();
/**
* List of loaded models
* 装车型一览
* @var array
* @access protected
*/
protected $_ci_models = array();
/**
* List of loaded helpers
* 加载佣工名单
* @var array
* @access protected
*/
protected $_ci_helpers = array();
/**
* List of class name mappings
* 类名映射列表
* @var array
* @access protected
*/
protected $_ci_varmap = array('unit_test' => 'unit',
'user_agent' => 'agent');
/**
* Constructor
*
* Sets the path to the view files and gets the initial output buffering level
* 设置视图文件的路径，并获得初始的输出缓冲级
*/
public function __construct()
{
//说明 int ob_get_level ( void ) 返回输出缓冲机制的嵌套级别。
$this->_ci_ob_level = ob_get_level();
//项目目录 以及系统 目录
$this->_ci_library_paths = array(APPPATH, BASEPATH);
//helper有项目目录和系统目录
$this->_ci_helper_paths = array(APPPATH, BASEPATH);
//model只有项目目录
$this->_ci_model_paths = array(APPPATH);
//view只有项目目录
$this->_ci_view_paths = array(APPPATH.'views/' => TRUE);
log_message('debug', "Loader Class Initialized 装载机类初始化");
}
// --------------------------------------------------------------------
/**
* Initialize the Loader
* 初始化装载机
* This method is called once in CI_Controller.
* 这种方法被称为一次在CI_Controller。
* @param array
* @return object
*/
public function initialize()
{
//_ci_classes为空数组
$this->_ci_classes = array();
//加载文件为空数组
$this->_ci_loaded_files = array();
//加载的model为空数组
$this->_ci_models = array();
//设置需要加载的类信息
$this->_base_classes =& is_loaded();
//自动加载磁带机
$this->_ci_autoloader();
//返回对象自己
return $this;
}
// --------------------------------------------------------------------
/**
* Is Loaded
*
* A utility function to test if a class is in the self::$_ci_classes array.
* This function returns the object name if the class tested for is loaded,
* and returns FALSE if it isn't.
*
* 实用功能测试，如果一类是在自我::$_ci_classes阵列。
* 这个函数返回对象的名称，如果类加载测试，
* 如果不是，则返回FALSE。
* It is mainly used in the form_helper -> _get_validation_object()
*
* @param string class being checked for
* @return mixed class object name on the CI SuperObject or FALSE
*/
//判断指定的类是否已经加载
public function is_loaded($class)
{
//判断在_ci_classes数组对象中，类是否已经存在
if (isset($this->_ci_classes[$class]))
{
return $this->_ci_classes[$class];
}
//不存在返回false
return FALSE;
}
// --------------------------------------------------------------------
/**
* Class Loader
*
* This function lets users load and instantiate classes.
* It is designed to be called from a user's app controllers.
* 此功能允许用户装载并实例化类。
* 它的目的是从用户的应用程序的控制器被称为。
* @param string the name of the class
* @param mixed the optional parameters
* @param string an optional object name
* @return void
*/
//类的加载
public function library($library = '', $params = NULL, $object_name = NULL)
{
//如果$library是数组
if (is_array($library))
{
//循环
foreach ($library as $class)
{
//加载每一个类，还有叁数值哦
$this->library($class, $params);
}
return;
}
//如果$library为空或者在_base_classes中不存在的话，直接返回空值
if ($library == '' OR isset($this->_base_classes[$library]))
{
return FALSE;
}
//如果$params 不为null,并且 不是数组的话，那么设置为空值
if ( ! is_null($params) && ! is_array($params))
{
$params = NULL;
}
//开始加载class类
//$library是类的名称，$params 是参数，$object_name是对象的名称
$this->_ci_load_class($library, $params, $object_name);
}
// --------------------------------------------------------------------
/**
* Model Loader
* Model类的加载
*
* This function lets users load and instantiate models.
* 此功能允许用户加载和实例模型
*
* @param string the name of the class
* @param string name for the model
* @param bool database connection
* @return void
*/
//$model model类的class名称
//$name 加载后model类的名称
//$db_conn 数据库链接
public function model($model, $name = '', $db_conn = FALSE)
{
//如果为数组
if (is_array($model))
{
//循环加载所有元素
foreach ($model as $babe)
{
$this->model($babe);
}
return; //然后返回
}
//如果为空值，直接返回
if ($model == '')
{
return;
}
//定义$path变量
$path = '';
// Is the model in a sub-folder? If so, parse out the filename and path.
//$last_slash = strtpos($model,'/') !== false
//如果$model有/字符串在中
if (($last_slash = strrpos($model, '/')) !== FALSE)
{
// The path is in front of the last slash
//取得/前面的字符，也就是model的路径名称
$path = substr($model, 0, $last_slash + 1);
// And the model name behind it
//取得model的名称
$model = substr($model, $last_slash + 1);
}
//如果没有自定义name那么name就用$model所定义的名称
if ($name == '')
{
$name = $model;
}
//如果该$name已经在$this->_ci_models中存在，直接返回空值
if (in_array($name, $this->_ci_models, TRUE))
{
return;
}
//取得超级的CI控制器类
$CI =& get_instance();
//
if (isset($CI->$name))
{
show_error('The model name you are loading is the name of a resource that is already being used: 加载的型号名称是资源的名称已被使用 '.$name);
}
//变为小写
$model = strtolower($model);
//开始循环加载所有_ci_model_paths信息
foreach ($this->_ci_model_paths as $mod_path)
{
//判断指定的models类是否存在
if ( ! file_exists($mod_path.'models/'.$path.$model.'.php'))
{
continue;
}
//如果$db_conn不为空，而且CI_DB类不为空
if ($db_conn !== FALSE AND ! class_exists('CI_DB'))
{
//如果为true直接将其设置为空字符串
if ($db_conn === TRUE)
{
$db_conn = '';
}
//然后加载databases这个类
$CI->load->database($db_conn, FALSE, TRUE);
}
//判断CI_Model如果不存在
if ( ! class_exists('CI_Model'))
{
//加载core目录下面的Model
load_class('Model', 'core');
}
//开始包含指定的model文件
require_once($mod_path.'models/'.$path.$model.'.php');
$model = ucfirst($model);//ucfirst将字符串的第一个字符大写
//new 一个model对象
$CI->$name = new $model();
//然后将其name存放入_ci_models数组中
$this->_ci_models[] = $name;
return;
}
// couldn't find the model
show_error('Unable to locate the model you have specified: 找不到您所指定的模型'.$model);
}
// --------------------------------------------------------------------
/**
* Database Loader
* 数据库装载机
*
* @param string the DB credentials DB凭据
* @param bool whether to return the DB object 是否返回DB对象
* @param bool whether to enable active record (this allows us to override the config setting)
* 是否启用活动记录（这使我们能够覆盖配置设置）
* @return object
*/
public function database($params = '', $return = FALSE, $active_record = NULL)
{
// Grab the super object 抓住超级对象
$CI =& get_instance();
// Do we even need to load the database class?
//我们甚至需要加载数据库类？
//这里有很多条件同时来判断我们是否需要加载数据库类
//CI_DB如果已经存
//不用返回DB对象
//不用启用活动记录
//$CI->db已经存在
//并且$CI->db已经是个对象
if (class_exists('CI_DB') AND $return == FALSE AND $active_record == NULL AND isset($CI->db) AND is_object($CI->db))
{
return FALSE;
}
//加载系统下面的databsase/DB.php文件
require_once(BASEPATH.'database/DB.php');
//如果需要返回DB对象
if ($return === TRUE)
{
//这里直接返回
return DB($params, $active_record);
}
// Initialize the db variable. Needed to prevent
// reference errors with some configurations
// 初始化DB变量。需要防止
// 引用错误与某些配置
$CI->db = ''; //先将以前的$CI->db设置为空值
// Load the DB class
//加载DB类
$CI->db =& DB($params, $active_record);
}
// --------------------------------------------------------------------
/**
* Load the Utilities Class
* 装入实用程序类
* @return string
*/
public function dbutil()
{
//如果CI_DB不存在，直接国载
if ( ! class_exists('CI_DB'))
{
$this->database();
}
//抓取超级类
$CI =& get_instance();
// for backwards compatibility, load dbforge so we can extend dbutils off it
// this use is deprecated and strongly discouraged
// 向后兼容性，加载dbforge关闭它，所以我们可以扩展dbutils
// 这已被弃用，极力劝阻
$CI->load->dbforge();
//加载系统下面的database/DB_tuility.php
require_once(BASEPATH.'database/DB_utility.php');
//根据数据库类型加载指定数据库类型的utility.php
require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_utility.php');
$class = 'CI_DB_'.$CI->db->dbdriver.'_utility';
//class的名称
$CI->dbutil = new $class(); //实例化
}
// --------------------------------------------------------------------
/**
* Load the Database Forge Class
* 装入数据库福尔类
*
* @return string
*/
public function dbforge()
{
//CI_DB是否存在
if ( ! class_exists('CI_DB'))
{
$this->database();
}
//超级类
$CI =& get_instance();
require_once(BASEPATH.'database/DB_forge.php');
require_once(BASEPATH.'database/drivers/'.$CI->db->dbdriver.'/'.$CI->db->dbdriver.'_forge.php');
$class = 'CI_DB_'.$CI->db->dbdriver.'_forge';
$CI->dbforge = new $class();
}
// --------------------------------------------------------------------
/**
* Load View
* 负载查看
* This function is used to load a "view" file. It has three parameters:
* 这个函数是用来加载一个“意见”文件。它有三个参数：
*
* 1. The name of the "view" file to be included.
* 2. An associative array of data to be extracted for use in the view.
* 3. TRUE/FALSE - whether to return the data or load it. In
* some cases it's advantageous to be able to return data so that
* a developer can process it in some way.
* 1。被列入“查看”文件的名称。
* 2。用于在视图中要提取的数据的关联数组。
* 3。 TRUE/ FALSE - 无论是将数据返回或加载它。在
* 某些情况下，它的优势是能够返回的数据，以便开发人员可以以某种方式处理。
* @param string
* @param array
* @param bool
* @return void
*/
public function view($view, $vars = array(), $return = FALSE)
{
//_ci_load()函数，是直接进行输出操作的，要么返回输出结果，要么直接从缓存中输出
return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_object_to_array($vars), '_ci_return' => $return));
}
// --------------------------------------------------------------------
/**
* Load File
*
* This is a generic file loader
* 这是一个通用的文件加载
* @param string
* @param bool
* @return string
*/
public function file($path, $return = FALSE)
{
return $this->_ci_load(array('_ci_path' => $path, '_ci_return' => $return));
}
// --------------------------------------------------------------------
/**
* Set Variables
* 设置变量
*
* Once variables are set they become available within
* the controller class and its "view" files.
* 一旦变量被设置成为内控制器类和它的“意见”文件。
* @param array
* @param string
* @return void
*/
public function vars($vars = array(), $val = '')
{
//如果$val为空，然后$vars是字符串的话，那么组合成一个数组键 值对
if ($val != '' AND is_string($vars))
{
$vars = array($vars => $val);
}
//转换为数组
$vars = $this->_ci_object_to_array($vars);
//如果$vars为数组，
if (is_array($vars) AND count($vars) > 0)
{
foreach ($vars as $key => $val)
{
//放入到缓存变量列表中去
$this->_ci_cached_vars[$key] = $val;
}
}
}
// --------------------------------------------------------------------
/**
* Get Variable
* 获取变量
* Check if a variable is set and retrieve it.
* 检查如果一个变量设置和检索。
*
* @param array
* @return void
*/
public function get_var($key)
{
return isset($this->_ci_cached_vars[$key]) ? $this->_ci_cached_vars[$key] : NULL;
}
// --------------------------------------------------------------------
/**
* Load Helper
*
* This function loads the specified helper file.
* 此函数加载指定的辅助文件。
*
* @param mixed
* @return void
*/
public function helper($helpers = array())
{
//helpers是指文件名，'_helper'是指扩展后缀
foreach ($this->_ci_prep_filename($helpers, '_helper') as $helper)
{
if (isset($this->_ci_helpers[$helper]))
{
continue;
}
//取得helpers的全部路径信息
//subclass_prefix 类扩展前缀
$ext_helper = APPPATH.'helpers/'.config_item('subclass_prefix').$helper.'.php';
// Is this a helper extension request? 这是一个辅助扩展的要求吗？
if (file_exists($ext_helper))
{
//helper的基类
$base_helper = BASEPATH.'helpers/'.$helper.'.php';
if ( ! file_exists($base_helper))
{
show_error('Unable to load the requested file: helpers 无法加载所需的文件：佣工/'.$helper.'.php');
}
include_once($ext_helper); //加载helper
include_once($base_helper);//加载base_helper，应该helper的基类
//在_ci_helpers[$helper]设置为true
$this->_ci_helpers[$helper] = TRUE;
log_message('debug', 'Helper loaded: 加载助手：'.$helper);
continue; //跳向下一次循环
}
// Try to load the helper
// 尝试加载帮手
foreach ($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: '.$helper);
break;
}
}
// unable to load the helper
// 无法加载帮手
if ( ! isset($this->_ci_helpers[$helper]))
{
show_error('Unable to load the requested file: helpers 能够加载所需的文件：佣工/'.$helper.'.php');
}
}
}
// --------------------------------------------------------------------
/**
* Load Helpers
*
* This is simply an alias to the above function in case the
* user has written the plural form of this function.
* 这是一个单纯的别名上述功能的情况下，
* 用户写这个函数的复数形式。
* @param array
* @return void
*/
public function helpers($helpers = array())
{
$this->helper($helpers);
}
// --------------------------------------------------------------------
/**
* Loads a language file
* 加载语言文件
*
* @param array
* @param string
* @return void
*/
public function language($file = array(), $lang = '')
{
//超级类
$CI =& get_instance();
//如果不为数组，需要转换为数组
if ( ! is_array($file))
{
$file = array($file);
}
//开始循环加载语言文件
foreach ($file as $langfile)
{
$CI->lang->load($langfile, $lang);
}
}
// --------------------------------------------------------------------
/**
* Loads a config file
* 加载配置文件
* @param string
* @param bool
* @param bool
* @return void
*/
public function config($file = '', $use_sections = FALSE, $fail_gracefully = FALSE)
{
$CI =& get_instance();
$CI->config->load($file, $use_sections, $fail_gracefully);
}
// --------------------------------------------------------------------
/**
* Driver
* 司机
* Loads a driver library
* 加载驱动程序库
*
* @param string the name of the class 的类名
* @param mixed the optional parameters 可选参数
* @param string an optional object name 一个可选的对象名称
* @return void
*/
public function driver($library = '', $params = NULL, $object_name = NULL)
{
if ( ! class_exists('CI_Driver_Library'))
{
// we aren't instantiating an object here, that'll be done by the Library itself
// 我们不是在这里实例化一个对象，那将图书馆本身
require BASEPATH.'libraries/Driver.php';
}
if ($library == '')
{
return FALSE;
}
// We can save the loader some time since Drivers will *always* be in a subfolder,
// 我们可以节省一些时间，因为装载机司机将总是在一个子文件夹，
// and typically identically named to the library
// 通常相同的命名图书馆
// 如果$library没有/字符的话，那么将重新组合$library
if ( ! strpos($library, '/'))
{
$library = ucfirst($library).'/'.$library;
}
//加载类
return $this->library($library, $params, $object_name);
}
// --------------------------------------------------------------------
/**
* Add Package Path
* 添加包路径
* Prepends a parent path to the library, model, helper, and config path arrays
* 前置一个父路径库，模型，辅助，配置路径阵列
* @param string
* @param boolean
* @return void
*/
public function add_package_path($path, $view_cascade=TRUE)
{
//去掉/然后再加上
$path = rtrim($path, '/').'/';
//在库的路径列表中删除$path
array_unshift($this->_ci_library_paths, $path);
//在model的路径列表中删除$path
array_unshift($this->_ci_model_paths, $path);
//在helper的路径表中删除$path
array_unshift($this->_ci_helper_paths, $path);
//设置_ci_view_paths的目录
//$path.view/等行view的缓存加上$_ci_view_paths;
$this->_ci_view_paths = array($path.'views/' => $view_cascade) + $this->_ci_view_paths;
// Add config file path
// 添加配置文件路径
$config =& $this->_ci_get_component('config');
//$config的config路径数组中删除path目录
array_unshift($config->_config_paths, $path);
}
// --------------------------------------------------------------------
/**
* Get Package Paths
* 包路径
*
* Return a list of all package paths, by default it will ignore BASEPATH.
* 所有包路径返回一个列表，默认情况下它会忽略BASEPATH的。
*
* @param string
* @return void
*/
public function get_package_paths($include_base = FALSE)
{
//如果为true返回所有library路径数组，否则显示model路径数组
return $include_base === TRUE ? $this->_ci_library_paths : $this->_ci_model_paths;
}
// --------------------------------------------------------------------
/**
* Remove Package Path
* 删除包路径
*
* Remove a path from the library, model, and helper path arrays if it exists
* If no path is provided, the most recently added path is removed.
* 删除路径从图书馆，型号，和助手路径阵列，如果它存在
* 如果没有提供路径，最近添加的路径被删除。
* @param type
* @param bool
* @return type
*/
public function remove_package_path($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, '/').'/';
//去掉路径
foreach (array('_ci_library_paths', '_ci_model_paths', '_ci_helper_paths') as $var)
{
//$key = array_search($path, $this->{$var}) != false
if (($key = array_search($path, $this->{$var})) !== FALSE)
{
//删除 $this->{$var}[$key]
unset($this->{$var}[$key]);
}
}
//查看在view里面是否存存该目录
if (isset($this->_ci_view_paths[$path.'views/']))
{
unset($this->_ci_view_paths[$path.'views/']);
}
//在config_paths里面是否存在该目录
if (($key = array_search($path, $config->_config_paths)) !== FALSE)
{
unset($config->_config_paths[$key]);
}
}
// make sure the application default paths are still in the array
// 确保应用程序的默认路径仍然在数组中
//array_merge 合并两个以上的数组
// array_unique 从数组中移出相同的值
$this->_ci_library_paths = array_unique(array_merge($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
*
* This function is used to load views and files.
* Variables are prefixed with _ci_ to avoid symbol collision with
* variables made available to view files
*
* 此功能是用来加载意见和文件。
* 变量都带有前缀_ci_避免符号碰撞变量以查看文件
* @param array
* @return void
*/
protected function _ci_load($_ci_data)
{
// Set the default data variables 默认数据变量
foreach (array('_ci_view', '_ci_vars', '_ci_path', '_ci_return') as $_ci_val)
{
//$$_ci_val 相当于$_ci_vaie $_ci_vars $_ci_path $_ci_return
//如果在$_ci_data存在这几个常量值时，设置为$_ci_data传过来的值，否则设置为false
$$_ci_val = ( ! isset($_ci_data[$_ci_val])) ? FALSE : $_ci_data[$_ci_val];
}
$file_exists = FALSE;
// Set the path to the requested file
// 设置到所需的文件的路径
if ($_ci_path != '')
{
//如果$_ci_path不为空值，
//分割字符串
//将最后一个字符数组元素赋值给$_ci_file;
$_ci_x = explode('/', $_ci_path);
$_ci_file = end($_ci_x);
}
else
{
// define ('PATHINFO_EXTENSION', 4);
// PATHINFO_EXTENSION - 只返回 extension
//只反回路径的一个扩展名
$_ci_ext = pathinfo($_ci_view, PATHINFO_EXTENSION);
//如果等于空，直接用.php
$_ci_file = ($_ci_ext == '') ? $_ci_view.'.php' : $_ci_view;
//开始循环view_paths数组
foreach ($this->_ci_view_paths as $view_file => $cascade)
{
//判断该文件是否存在
if (file_exists($view_file.$_ci_file))
{
//设置为$_ci_path路径，$file_exists为true 然后返回
$_ci_path = $view_file.$_ci_file;
$file_exists = TRUE;
break;
}
//如果没有缓存，直接返回
if ( ! $cascade)
{
break;
}
}
}
//如果文件不存，并且 $_ci_path路径也不存在
if ( ! $file_exists && ! file_exists($_ci_path))
{
show_error('Unable to load the requested file: 无法加载所需的文件'.$_ci_file);
}
// This allows anything loaded using $this->load (views, files, etc.)
// to become accessible from within the Controller and Model functions.
// 这允许任何加载使用 - >负载（视图，文件等）
// 从控制器和模型功能成为访问。
$_ci_CI =& get_instance(); //加载超级CI控制器类
//get_object_vars() 返回由对象属性组成的关联数组
foreach (get_object_vars($_ci_CI) as $_ci_key => $_ci_var)
{
//如果该$_ci_key值不存在的话，那么
if ( ! isset($this->$_ci_key))
{
//设置该 _ci_key值，方法是用引用调用$_ci_CI->$_ci_key;
$this->$_ci_key =& $_ci_CI->$_ci_key;
}
}
/*
* Extract and cache variables
* 提取和缓存变量
*
* You can either set variables using the dedicated $this->load_vars()
* function or via the second parameter of this function. We'll merge
* the two types and cache them so that views that are embedded within
* other views can have access to these variables.
*
* 您可以设置使用专用> load_vars（变量）
* 函数或通过在此函数中的第二个参数。我们将合并
* 两种类型并将其缓存的意见，内嵌入其他意见，可以对这些变量的访问。
*
*
*/
//将$_ci_vars合并到缓存变量中去
if (is_array($_ci_vars))
{
$this->_ci_cached_vars = array_merge($this->_ci_cached_vars, $_ci_vars);
}
extract($this->_ci_cached_vars);
//extract() 从数组中输出变量到符号列表中
/*
* Buffer the output
* 缓冲输出
*
* We buffer the output for two reasons:
* 1. Speed. You get a significant speed boost.
* 2. So that the final rendered template can be
* post-processed by the output class. Why do we
* need post processing? For one thing, in order to
* show the elapsed page load time. Unless we
* can intercept the content right before it's sent to
* the browser and then stop the timer it won't be accurate.
*
* *缓冲输出，有两个原因：
* 1。速度。你得到了显着的速度提升。
* 2。所以，最终呈现的模板可以是
* 后期处理的输出类。为什么我们
* 需要后期处理？一方面，为了
* 显示经过的页面加载时间。除非我们
* 可以拦截内容的权利，发出之前，
* 浏览器，然后停止计时器，它不会是准确的。
*/
ob_start(); //打开缓冲区
// If the PHP installation does not support short tags we'll
// do a little string replacement, changing the short tags
// to standard PHP echo statements.
// 如果PHP安装不支持短标记，我们会做一个小的字符串替换，
// 改变短标签标准的PHP的echo语句。
//short_open_tag是否在phpinfo中打开了短标答
//rewrite_short_tags如果在系统不支持短标签时，可以用CI自行开启短标签设置
if ((bool) @ini_get('short_open_tag') === FALSE AND config_item('rewrite_short_tags') == TRUE)
{
//下面进行直接老输出
//str_replace('<?=', '<?php echo ', file_get_contents($_ci_path))
//将所有$_ci_path里面的内容都进行替换操作，也就是<?= 替换成<?php echo
//然后还需要进行一个正则的替换
echo eval('?>'.preg_replace("/;*\s*\?>/", "; ?>", str_replace('<?=', '<?php echo ', file_get_contents($_ci_path))));
}
else
{
//允许具有相同名称的多个视图
include($_ci_path); // include() vs include_once() allows for multiple views with the same name
}
log_message('debug', 'File loaded: 加载的文件 '.$_ci_path);
// Return the file data if requested
// 如果要求返回文件数据
if ($_ci_return === TRUE)
{
$buffer = ob_get_contents(); //ob_get_contents() 保存缓冲数据
@ob_end_clean(); //关闭缓冲区
return $buffer; //返回数据
}
/*
* Flush the buffer... or buff the flusher?
* 刷新缓冲区...或浅黄色的冲水？
*
* In order to permit views to be nested within
* other views, we need to flush the content back out whenever
* we are beyond the first level of output buffering so that
* it can be seen and included properly by the first included
* template and any subsequent ones. Oy!
* 为了允许意见嵌套在
* 其他意见，我们需要冲洗的内容，回时
* 我们是超越第一级的输出缓冲，所以，
* 可以看出，适当地包括由第一
* 模板和任何后续的。 Oy公司！
*/
//ob_get_level() 错误级别，大小_ci_ob_level+1的话
if (ob_get_level() > $this->_ci_ob_level + 1)
{
ob_end_flush(); //ob_end_flush 清除输出缓冲并且关闭输出缓冲区
}
else
{
//添加到output的append_output里面去
$_ci_CI->output->append_output(ob_get_contents());
@ob_end_clean(); //关闭缓冲区
}
}
// --------------------------------------------------------------------
/**
* Load class
* 加载class类
*
* This function loads the requested class.
* 此功能加载所请求的类。
*
* @param string the item that is being loaded 正在装入的产品
* @param mixed any additional parameters 任何额外的参数
* @param string an optional object name 一个可选的对象名称
* @return void
*/
protected function _ci_load_class($class, $params = NULL, $object_name = NULL)
{
// Get the class name, and while we're at it trim any slashes.
// The directory path can be included as part of the class name,
// but we don't want a leading slash
// 获取类的名字，虽然我们在修剪任何斜线。的目录路径可以包含类名的一部分，
// 但我们不希望领先的斜线
$class = str_replace('.php', '', trim($class, '/'));
// Was the path included with the class name?
// We look for a slash to determine this
// 路径的类名？
// 我们期待一个斜线确定此
$subdir = '';
//取最后的斜线
if (($last_slash = strrpos($class, '/')) !== FALSE)
{
// Extract the path
//路径名
$subdir = substr($class, 0, $last_slash + 1);
// Get the filename from the path
// 类名
$class = substr($class, $last_slash + 1);
}
// We'll test for both lowercase and capitalized versions of the file name
//我们将测试的文件名小写和大写两种版本
foreach (array(ucfirst($class), strtolower($class)) as $class)
{
//subclass的整个路径
$subclass = APPPATH.'libraries/'.$subdir.config_item('subclass_prefix').$class.'.php';
// Is this a class extension request?
// 这是一类扩展的要求吗？ 文件是否存在
if (file_exists($subclass))
{
//取得在系统的libraries上面将$class首字母大写的一个.php文件
$baseclass = BASEPATH.'libraries/'.ucfirst($class).'.php';
//如果该文件不存在
if ( ! file_exists($baseclass))
{
log_message('error', "Unable to load the requested class 无法加载所请求的类: ".$class);
show_error("Unable to load the requested class 无法加载所请求的类: ".$class);
}
// Safety: Was the class already loaded by a previous call?
// 安全：由先前调用类已经加载？
//如果该类的已经在_ci_loader_files中存在
if (in_array($subclass, $this->_ci_loaded_files))
{
// Before we deem this to be a duplicate request, let's see
// if a custom object name is being supplied. If so, we'll
// return a new instance of the object
// 之前，我们认为这是一个重复的请求，让我们来看看
// 如果自定义对象的名称。如果是这样，我们会
// 返回一个新的对象实例
// 如果对象名称不为空，
if ( ! is_null($object_name))
{
$CI =& get_instance();
//如果在超级类中这个对象名称不存在
if ( ! isset($CI->$object_name))
{
//实例化一个类
return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);
}
}
$is_duplicate = TRUE;
log_message('debug', $class." class already loaded. Second attempt ignored. 已加载的类。第二次尝试被忽略");
return;
}
include_once($baseclass);
include_once($subclass);
$this->_ci_loaded_files[] = $subclass;
return $this->_ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);
}
// Lets search for the requested library file and load it.
// 让搜索请求的库文件，并加载它。
$is_duplicate = FALSE;
foreach ($this->_ci_library_paths as $path)
{
//在库文件下面查找指定的类文件
$filepath = $path.'libraries/'.$subdir.$class.'.php';
// Does the file exist? No? Bummer...
if ( ! file_exists($filepath))
{
continue;//不存在，直接跳出本次循环
}
// Safety: Was the class already loaded by a previous call?
// 安全：由先前调用类已经加载？
if (in_array($filepath, $this->_ci_loaded_files))
{
// Before we deem this to be a duplicate request, let's see
// if a custom object name is being supplied. If so, we'll
// return a new instance of the object
if ( ! is_null($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, $object_name);
}
} // END FOREACH
// One last attempt. Maybe the library is in a subdirectory, but it wasn't specified?
// 最后一次尝试。图书馆也许是在一个子目录，但它没有指定？
if ($subdir == '')
{
$path = strtolower($class).'/'.$class;
return $this->_ci_load_class($path, $params);
}
// If we got this far we were unable to find the requested class.
// We do not issue errors if the load call failed due to a duplicate request
// 如果我们走了这么远，我们无法找到所请求的类。
// 我们不发出错误如果负载调用失败，因为重复的请求
if ($is_duplicate == FALSE)
{
log_message('error', "Unable to load the requested class: 无法加载所请求的类 ".$class);
show_error("Unable to load the requested class: 无法加载所请求的类".$class);
}
}
// --------------------------------------------------------------------
/**
* Instantiates a class
* 实例化一个类
* @param string
* @param string
* @param bool
* @param string an optional object name 一个可选的对象名称
* @return null
*/
protected function _ci_init_class($class, $prefix = '', $config = FALSE, $object_name = NULL)
{
// Is there an associated config file for this class? Note: these should always be lowercase
// 这个类是否有相关的配置文件？注：这些应该总是小写。
//如果没有配置文件
if ($config === NULL)
{
// Fetch the config paths containing any package paths
// 取配置路径包含任何包的路径
$config_component = $this->_ci_get_component('config'); //相当于取$CI->config
if (is_array($config_component->_config_paths))
{
// Break on the first found file, thus package files
// are not overridden by default paths
// 突破首次发现的文件，因此包文件
// 是不是默认路径覆盖
foreach ($config_component->_config_paths as $path)
{
// We test for both uppercase and lowercase, for servers that
// are case-sensitive with regard to file names. Check for environment
// first, global next
//我们测试大写和小写，用于服务器
//文件名是大小写敏感的。检查环境
//首先，全球下
if (defined('ENVIRONMENT') AND file_exists($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($class)).'.php');
break;
}
}
}
}
//如果类的前缀为空
if ($prefix == '')
{
//判断是否为CI_ClassName
if (class_exists('CI_'.$class))
{
$name = 'CI_'.$class;
}
//是否为MY_ClassName
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?
// 类名是否有效？
if ( ! class_exists($name))
{
log_message('error', "Non-existent class: 不存在类 ".$name);
show_error("Non-existent class: 不存在类 ".$class);
}
// Set the variable name we will assign the class to
// Was a custom class name supplied? If so we'll use it
// 设置变量的名称，我们将类分配给
// 提供一个自定义的类名？如果是这样，我们将用它
$class = strtolower($class);
//$this->_ci_varmap() 类名映射列表
//看是否对该类进行了映射片时
if (is_null($object_name))
{
$classvar = ( ! isset($this->_ci_varmap[$class])) ? $class : $this->_ci_varmap[$class];
}
else
{
$classvar = $object_name;
}
// Save the class name and object name
// 保存的类名和对象名
$this->_ci_classes[$class] = $classvar;
// Instantiate the class 实例化的类
$CI =& get_instance();
if ($config !== NULL)
{
$CI->$classvar = new $name($config);
}
else
{
$CI->$classvar = new $name;
}
}
// --------------------------------------------------------------------
/**
* Autoloader
* 自动加载磁带机
* The config/autoload.php file contains an array that permits sub-systems,
* libraries, and helpers to be loaded automatically.
*
* 的config/autoload.php的文件包含一个数组，允许子系统，库和佣工被自动加载。
* @param array
* @return void
*/
private function _ci_autoloader()
{
if (defined('ENVIRONMENT') AND file_exists(APPPATH.'config/'.ENVIRONMENT.'/autoload.php'))
{
include(APPPATH.'config/'.ENVIRONMENT.'/autoload.php');
}
else
{
include(APPPATH.'config/autoload.php');
}
//config/autoload.php 设置初始化需要加载的一些类及方法或者其它信息等
//如果$autoload变量为空的话，直接返回
if ( ! isset($autoload))
{
return FALSE;
}
// Autoload packages
// 自动加载包
if (isset($autoload['packages']))
{
foreach ($autoload['packages'] as $package_path)
{
//添加到add_package_path中去
$this->add_package_path($package_path);
}
}
// Load any custom config file
// 加载任何自定义的配置文件...
if (count($autoload['config']) > 0)
{
$CI =& get_instance();
foreach ($autoload['config'] as $key => $val)
{
$CI->config->load($val);
}
}
// Autoload helpers and languages
// 自动加载佣工和语言
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 $autoload['core'] item was deprecated
// 一个小的调整，以保持向后兼容
// 自动加载['核心']项目被废弃
if ( ! isset($autoload['libraries']) AND isset($autoload['core']))
{
$autoload['libraries'] = $autoload['core'];
}
// Load libraries 负载库
if (isset($autoload['libraries']) AND count($autoload['libraries']) > 0)
{
// Load the database driver.
// 加载数据库驱动程序
if (in_array('database', $autoload['libraries']))
{
$this->database();
//array_diff计算数组的差值
$autoload['libraries'] = array_diff($autoload['libraries'], array('database'));
}
// Load all other libraries装入其它所有库
foreach ($autoload['libraries'] as $item)
{
$this->library($item);
}
}
// Autoload models
// 自动加载模型
if (isset($autoload['model']))
{
$this->model($autoload['model']);
}
}
// --------------------------------------------------------------------
/**
* Object to Array
* 对象阵列
* Takes an object as input and converts the class variables to array key/vals
* 一个对象作为输入，并将其转换类变量数组的键/丘壑
*
* @param object
* @return array
*/
protected function _ci_object_to_array($object)
{
//get_object_vars() 取得该类的所有属性返回数组
return (is_object($object)) ? get_object_vars($object) : $object;
}
// --------------------------------------------------------------------
/**
* Get a reference to a specific library or model
* 参考到一个特定的库或模型
*
* @param string
* @return bool
*/
protected function &_ci_get_component($component)
{
$CI =& get_instance(); //取得超级控件器对象，然后取得该模型
return $CI->$component;
}
// --------------------------------------------------------------------
/**
* Prep filename
* 准备文件名
* This function preps the name of various items to make loading them more reliable.
* 此功能PREPS各种项目，使加载它们更可靠的名称。
* @param mixed
* @param string
* @return array
*/
protected function _ci_prep_filename($filename, $extension)
{
//如果filename不为数组
if ( ! is_array($filename))
{
//
//$a = str_replace($extension, '', $filename) //在filename把后缀替换为空值
//$a = str_replace('.php', '', $a); 将php替换为空值
//return array(strtolower($a.$extension));
return array(strtolower(str_replace('.php', '', str_replace($extension, '', $filename)).$extension));
}
else
{
foreach ($filename as $key => $val)
{
//处理方法一样，
$filename[$key] = strtolower(str_replace('.php', '', str_replace($extension, '', $val)).$extension);
}
return $filename;
}
}
}
/* End of file Loader.php */
/* Location: ./system/core/Loader.php */
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