CI框架裝載器Loader.php源碼分析

2020-03-22 20:12:07

字體：大中小

供稿：網(wǎng)友

顧名思義，裝載器就是加載元素的，使用CI時，經(jīng)常加載的有：$this- load- library()
$this- load- view()
$this- load- model()
$this- load- database()
$this- load- helper()
$this- load- config()
$this- load- add_package_path()復(fù)制代碼代碼如下:
/**
* Loader Class
*
* 用戶加載views和files，常見的函數(shù)有model(),view(),library(),helper()
*
* Controller的好助手，$this- load =& load_html' target='_blank'>class('Loader', 'core');，加載了loader，Controller就無比強大了
*/
class CI_Loader {
protected $_ci_ob_level;
protected $_ci_view_paths= array();
protected $_ci_library_paths= array();
protected $_ci_model_paths= array();
protected $_ci_helper_paths= array();
protected $_base_classes= array(); // Set by the controller class
protected $_ci_cached_vars= array();
protected $_ci_classes= array();
protected $_ci_loaded_files= array();

protected $_ci_models= array();
protected $_ci_helpers= array();
protected $_ci_varmap= array('unit_test' = 'unit',
'user_agent' = 'agent');
public function __construct()
{
//獲取緩沖嵌套級別
$this- _ci_ob_level = ob_get_level();
//library路徑
$this- _ci_library_paths = array(APPPATH, BASEPATH);
//helper路徑
$this- _ci_helper_paths = array(APPPATH, BASEPATH);
//model路徑
$this- _ci_model_paths = array(APPPATH);
//view路徑
$this- _ci_view_paths = array(APPPATH.'views/'= TRUE);
log_message('debug', "Loader Class Initialized");
}
// --------------------------------------------------------------------
/**
* 初始化Loader
*
*/
public function initialize()
{
$this- _ci_classes = array();
$this- _ci_loaded_files = array();
$this- _ci_models = array();
//將is_loaded（common中記錄加載核心類函數(shù)）加載的核心類交給_base_classes
$this- _base_classes =& is_loaded();
//加載autoload.php配置中文件
$this- _ci_autoloader();
return $this;
}
// --------------------------------------------------------------------
/**
* 檢測類是否加載
*/
public function is_loaded($class)
{
if (isset($this- _ci_classes[$class]))
{
return $this- _ci_classes[$class];
}
return FALSE;
}
// --------------------------------------------------------------------
/**
* 加載Class
*/
public function library($library = '', $params = NULL, $object_name = NULL)
{
if (is_array($library))
{
foreach ($library as $class)
{
$this- library($class, $params);
}
return;
}
//如果$library為空或者已經(jīng)加載。。。
if ($library == '' OR isset($this- _base_classes[$library]))
{
return FALSE;
}
if ( ! is_null($params) && ! is_array($params))
{
$params = NULL;
}
$this- _ci_load_class($library, $params, $object_name);
}
// --------------------------------------------------------------------
/**
* 加載和實例化model
*/
public function model($model, $name = '', $db_conn = FALSE)
{
//CI支持?jǐn)?shù)組加載多個model
if (is_array($model))
{
foreach ($model as $babe)
{
$this- model($babe);
}
return;
}
if ($model == '')
{
return;
}
$path = '';
// 是否存在子目錄
if (($last_slash = strrpos($model, '/')) !== FALSE)
{
// The path is in front of the last slash
$path = substr($model, 0, $last_slash + 1);
// And the model name behind it
$model = substr($model, $last_slash + 1);
}
if ($name == '')
{
$name = $model;
}
if (in_array($name, $this- _ci_models, TRUE))
{
return;
}
$CI =& get_instance();
if (isset($CI- $name))
{
show_error('The model name you are loading is the name of a resource that is already being used: '.$name);
}
$model = strtolower($model); //model文件名全小寫
foreach ($this- _ci_model_paths as $mod_path)
{
if ( ! file_exists($mod_path.'models/'.$path.$model.'.php'))
{
continue;
}
if ($db_conn !== FALSE AND ! class_exists('CI_DB'))
{
if ($db_conn === TRUE)
{
$db_conn = '';
}
$CI- load- database($db_conn, FALSE, TRUE);
}
if ( ! class_exists('CI_Model'))
{
load_class('Model', 'core');
}
require_once($mod_path.'models/'.$path.$model.'.php');
$model = ucfirst($model);
$CI- $name = new $model();
//保存在Loader::_ci_models中，以后可以用它來判斷某個model是否已經(jīng)加載過。
$this- _ci_models[] = $name;
return;
}
// couldn't find the model
show_error('Unable to locate the model you have specified: '.$model);
}
// --------------------------------------------------------------------
/**
* 數(shù)據(jù)庫Loader
*/
public function database($params = '', $return = FALSE, $active_record = NULL)
{
// Grab the super object
$CI =& get_instance();
// 是否需要加載db
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);
}
// Initialize the db variable. Needed to prevent
// reference errors with some configurations
$CI- db = '';
// Load the DB class
$CI- db =& DB($params, $active_record);
}
// --------------------------------------------------------------------
/**
* 加載數(shù)據(jù)庫工具類
*/
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
*
* @returnstring
*/
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 $class();
}
// --------------------------------------------------------------------
/**
* 加載視圖文件
*/
public function view($view, $vars = array(), $return = FALSE)
{
return $this- _ci_load(array('_ci_view' = $view, '_ci_vars' = $this- _ci_object_to_array($vars), '_ci_return' = $return));
}
// --------------------------------------------------------------------
/**
* 加載普通文件
*/
public function file($path, $return = FALSE)
{
return $this- _ci_load(array('_ci_path' = $path, '_ci_return' = $return));
}
// --------------------------------------------------------------------
/**
* 設(shè)置變量
*
* Once variables are set they become available within
* the controller class and its "view" files.
*
*/
public function vars($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] = $val;
}
}
}
// --------------------------------------------------------------------
/**
* 檢查并獲取變量
*/
public function get_var($key)
{
return isset($this- _ci_cached_vars[$key]) $this- _ci_cached_vars[$key] : NULL;
}
// --------------------------------------------------------------------
/**
* 加載helper
*/
public function helper($helpers = array())
{
foreach ($this- _ci_prep_filename($helpers, '_helper') as $helper)
{
if (isset($this- _ci_helpers[$helper]))
{
continue;
}
$ext_helper = APPPATH.'helpers/'.config_item('subclass_prefix').$helper.'.php';
// 如果是擴(kuò)展helper的話
if (file_exists($ext_helper))
{
$base_helper = BASEPATH.'helpers/'.$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: '.$helper);
continue;
}
// 如果不是擴(kuò)展helper，helper路徑中加載helper
foreach ($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: '.$helper);
break;
}
}
// 如果該helper還沒加載成功的話，說明加載helper失敗
if ( ! isset($this- _ci_helpers[$helper]))
{
show_error('Unable to load the requested file: helpers/'.$helper.'.php');
}
}
}
// --------------------------------------------------------------------
/**
* 可以看到helpers調(diào)用也是上面的helper,只是helpers的別名而已
*/
public function helpers($helpers = array())
{
$this- helper($helpers);
}
// --------------------------------------------------------------------
/**
* 加載language文件
*/
public function language($file = array(), $lang = '')
{
$CI =& get_instance();
if ( ! is_array($file))
{
$file = array($file);
}
foreach ($file as $langfile)
{
$CI- lang- load($langfile, $lang);
}
}
// --------------------------------------------------------------------
/**
* 加載配置文件
*/
public function config($file = '', $use_sections = FALSE, $fail_gracefully = FALSE)
{
$CI =& get_instance();
$CI- config- load($file, $use_sections, $fail_gracefully);
}
// --------------------------------------------------------------------
/**
* Driver
*
* 加載 driver library
*/
public function driver($library = '', $params = NULL, $object_name = NULL)
{
if ( ! class_exists('CI_Driver_Library'))
{
// we aren't instantiating an object here, that'll be done by the Library itself
require BASEPATH.'libraries/Driver.php';
}
if ($library == '')
{
return FALSE;
}
// We can save the loader some time since Drivers will *always* be in a subfolder,
// and typically identically named to the library
if ( ! strpos($library, '/'))
{
$library = ucfirst($library).'/'.$library;
}
return $this- library($library, $params, $object_name);
}
// --------------------------------------------------------------------
/**
* 添加 Package 路徑
*
* 把package路徑添加到庫，模型，助手，配置路徑
*/
public function add_package_path($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, $path);
}
// --------------------------------------------------------------------
/**
* 獲取Package Paths，默認(rèn)不包含BASEPATH
*/
public function get_package_paths($include_base = FALSE)
{
return $include_base === TRUE $this- _ci_library_paths : $this- _ci_model_paths;
}
// --------------------------------------------------------------------
/**
* 剔除Package Path
*
* Remove a path from the library, model, and helper path arrays if it exists
* If no path is provided, the most recently added path is removed.
*
*/
public function remove_package_path($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]);
}
}
// 保證應(yīng)用默認(rèn)的路徑依然存在
$this- _ci_library_paths = array_unique(array_merge($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
*
* @paramarray
* @returnvoid
*/
protected function _ci_load($_ci_data)
{
// Set the default data variables
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];
}
$file_exists = FALSE;
//如果$_ci_path不為空，則說明當(dāng)前要加載普通文件。Loader::file才會有path
if ($_ci_path != '')
{
$_ci_x = explode('/', $_ci_path);
$_ci_file = end($_ci_x);
}
else
{
$_ci_ext = pathinfo($_ci_view, PATHINFO_EXTENSION);
$_ci_file = ($_ci_ext == '') $_ci_view.'.php' : $_ci_view;
foreach ($this- _ci_view_paths as $view_file = $cascade)
{
if (file_exists($view_file.$_ci_file))
{
$_ci_path = $view_file.$_ci_file;
$file_exists = TRUE;
break;
}
if ( ! $cascade)
{
break;
}
}
}
//view文件不存在則會報錯
if ( ! $file_exists && ! file_exists($_ci_path))
{
show_error('Unable to load the requested file: '.$_ci_file);
}
// 把CI的所有屬性都傳遞給loader，view中$this指的是loader
$_ci_CI =& get_instance();
foreach (get_object_vars($_ci_CI) as $_ci_key = $_ci_var)
{
if ( ! isset($this- $_ci_key))
{
$this- $_ci_key =& $_ci_CI- $_ci_key;
}
}
/*
* Extract and cache variables
*
* You can either set variables using the dedicated $this- load_vars()
* function or via the second parameter of this function. We'll merge
* the two types and cache them so that views that are embedded within
* other views can have access to these variables.
*/
if (is_array($_ci_vars))
{
$this- _ci_cached_vars = array_merge($this- _ci_cached_vars, $_ci_vars);
}
extract($this- _ci_cached_vars);
/*
* 將視圖內(nèi)容放到緩存區(qū)
*
*/
ob_start();
// 支持短標(biāo)簽
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); // include() vs include_once() allows for multiple views with the same name
}
log_message('debug', 'File loaded: '.$_ci_path);
// 是否直接返回view數(shù)據(jù)
if ($_ci_return === TRUE)
{
$buffer = ob_get_contents();
@ob_end_clean();
return $buffer;
}
//當(dāng)前這個視圖文件是被另一個視圖文件通過$this- view()方法引入，即視圖文件嵌入視圖文件
if (ob_get_level() $this- _ci_ob_level + 1)
{
ob_end_flush();
}
else
{ ////把緩沖區(qū)的內(nèi)容交給Output組件并清空關(guān)閉緩沖區(qū)。
$_ci_CI- output- append_output(ob_get_contents());
@ob_end_clean();
}
}
// --------------------------------------------------------------------
/**
* 加載類
*/
protected function _ci_load_class($class, $params = NULL, $object_name = NULL)
{
// 去掉.php和兩端的/獲取的$class就是類名或目錄名+類名
$class = str_replace('.php', '', trim($class, '/'));
// CI允許dir/filename方式
$subdir = '';
if (($last_slash = strrpos($class, '/')) !== FALSE)
{
// 目錄
$subdir = substr($class, 0, $last_slash + 1);
// 文件名
$class = substr($class, $last_slash + 1);
}
// 允許加載的類名首字母大寫或全小寫
foreach (array(ucfirst($class), strtolower($class)) as $class)
{
$subclass = APPPATH.'libraries/'.$subdir.config_item('subclass_prefix').$class.'.php';
// 是否是擴(kuò)展類
if (file_exists($subclass))
{
$baseclass = BASEPATH.'libraries/'.ucfirst($class).'.php';
if ( ! file_exists($baseclass))
{
log_message('error', "Unable to load the requested class: ".$class);
show_error("Unable to load the requested class: ".$class);
}
// Safety: Was the class already loaded by a previous call
if (in_array($subclass, $this- _ci_loaded_files))
{
// Before we deem this to be a duplicate request, let's see
// if a custom object name is being supplied. If so, we'll
// return a new instance of the object
if ( ! is_null($object_name))
{
$CI =& get_instance();
if ( ! isset($CI- $object_name))
{
return $this- _ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);
}
}
$is_duplicate = TRUE;
log_message('debug', $class." class already loaded. Second attempt ignored.");
return;
}
include_once($baseclass);
include_once($subclass);
$this- _ci_loaded_files[] = $subclass;
//實例化類
return $this- _ci_init_class($class, config_item('subclass_prefix'), $params, $object_name);
}
// 如果不是擴(kuò)展，和上面類似
$is_duplicate = FALSE;
foreach ($this- _ci_library_paths as $path)
{
$filepath = $path.'libraries/'.$subdir.$class.'.php';
// Does the file exist No Bummer...
if ( ! file_exists($filepath))
{
continue;
}
// Safety: Was the class already loaded by a previous call
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, $object_name);
}
} // END FOREACH
// 如果還沒有找到該class，最后的嘗試是該class會不會在同名的子目錄下
if ($subdir == '')
{
$path = strtolower($class).'/'.$class;
return $this- _ci_load_class($path, $params);
}
// 加載失敗，報錯
if ($is_duplicate == FALSE)
{
log_message('error', "Unable to load the requested class: ".$class);
show_error("Unable to load the requested class: ".$class);
}
}
// --------------------------------------------------------------------
/**
* 實例化已經(jīng)加載的類
*/
protected function _ci_init_class($class, $prefix = '', $config = FALSE, $object_name = NULL)
{
// 是否有類的配置信息
if ($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 == '')
{ //system下library
if (class_exists('CI_'.$class))
{
$name = 'CI_'.$class;
}
elseif (class_exists(config_item('subclass_prefix').$class))
{ //擴(kuò)展library
$name = config_item('subclass_prefix').$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;
// 將初始化的類的實例給CI超級句柄
$CI =& get_instance();
if ($config !== NULL)
{
$CI- $classvar = new $name($config);
}
else
{
$CI- $classvar = new $name;
}
}
// --------------------------------------------------------------------
/**
* 自動加載器
*
* autoload.php配置的自動加載文件有：
* | 1. Packages
| 2. Libraries
| 3. Helper files
| 4. Custom config files
| 5. Language files
| 6. Models
*/
private function _ci_autoloader()
{
if (defined('ENVIRONMENT') AND file_exists(APPPATH.'config/'.ENVIRONMENT.'/autoload.php'))
{
include(APPPATH.'config/'.ENVIRONMENT.'/autoload.php');
}
else
{
include(APPPATH.'config/autoload.php');
}
if ( ! isset($autoload))
{
return FALSE;
}
// 自動加載packages,也就是將package_path加入到library，model，helper，config
if (isset($autoload['packages']))
{
foreach ($autoload['packages'] as $package_path)
{
$this- add_package_path($package_path);
}
}
// 加載config文件
if (count($autoload['config']) 0)
{
$CI =& get_instance();
foreach ($autoload['config'] as $key = $val)
{
$CI- config- load($val);
}
}
// 加載helper和language
foreach (array('helper', 'language') as $type)
{
if (isset($autoload[$type]) AND count($autoload[$type]) 0)
{
$this- $type($autoload[$type]);
}
}
// 這個好像是為了兼容以前版本的
if ( ! isset($autoload['libraries']) AND isset($autoload['core']))
{
$autoload['libraries'] = $autoload['core'];
}
// 加載libraries
if (isset($autoload['libraries']) AND count($autoload['libraries']) 0)
{
// 加載db
if (in_array('database', $autoload['libraries']))
{
$this- database();
$autoload['libraries'] = array_diff($autoload['libraries'], array('database'));
}
// 加載所有其他libraries
foreach ($autoload['libraries'] as $item)
{
$this- library($item);
}
}
// Autoload models
if (isset($autoload['model']))
{
$this- model($autoload['model']);
}
}
// --------------------------------------------------------------------
/**
* 返回由對象屬性組成的關(guān)聯(lián)數(shù)組
*/
protected function _ci_object_to_array($object)
{
return (is_object($object)) get_object_vars($object) : $object;
}
// --------------------------------------------------------------------
/**
* 獲取CI某個組件的實例
*/
protected function &_ci_get_component($component)
{
$CI =& get_instance();
return $CI- $component;
}
// --------------------------------------------------------------------
/**
* 處理文件名，這個函數(shù)主要是返回正確文件名
*/
protected function _ci_prep_filename($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;
}
}
}
PHP教程

鄭重聲明：本文版權(quán)歸原作者所有，轉(zhuǎn)載文章僅為傳播更多信息之目的，如作者信息標(biāo)記有誤，請第一時間聯(lián)系我們修改或刪除，多謝。

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