<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014 - 2018, British Columbia Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @packageCodeIgniter
* @authorEllisLab Dev Team
* @copyrightCopyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
* @copyrightCopyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/)
* @licensehttp://opensource.org/licenses/MITMIT License
* @linkhttps://codeigniter.com
* @sinceVersion 1.0.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* Loader Class
*
* Loads framework components.
*
* @packageCodeIgniter
* @subpackageLibraries
* @categoryLoader
* @authorEllisLab Dev Team
* @linkhttps://codeigniter.com/user_guide/libraries/loader.html
*/
class CI_Loader {
// All these are set automatically. Don't mess with them.
/**
* Nesting level of the output buffering mechanism
*
* @varint
*/
protected $_ci_ob_level;
/**
* List of paths to load views from
*
* @vararray
*/
protected $_ci_view_paths =array(VIEWPATH=> TRUE);
/**
* List of paths to load libraries from
*
* @vararray
*/
protected $_ci_library_paths =array(APPPATH, BASEPATH);
/**
* List of paths to load models from
*
* @vararray
*/
protected $_ci_model_paths =array(APPPATH);
/**
* List of paths to load helpers from
*
* @vararray
*/
protected $_ci_helper_paths =array(APPPATH, BASEPATH);
/**
* List of cached variables
*
* @vararray
*/
protected $_ci_cached_vars =array();
/**
* List of loaded classes
*
* @vararray
*/
protected $_ci_classes =array();
/**
* List of loaded models
*
* @vararray
*/
protected $_ci_models =array();
/**
* List of loaded helpers
*
* @vararray
*/
protected $_ci_helpers =array();
/**
* List of class name mappings
*
* @vararray
*/
protected $_ci_varmap =array(
'unit_test' => 'unit',
'user_agent' => 'agent'
);
// --------------------------------------------------------------------
/**
* Class constructor
*
* Sets component load paths, gets the initial output buffering level.
*
* @returnvoid
*/
public function __construct()
{
$this->_ci_ob_level = ob_get_level();
$this->_ci_classes =& is_loaded();
log_message('info', 'Loader Class Initialized');
}
// --------------------------------------------------------------------
/**
* Initializer
*
* @todoFigure out a way to move this to the constructor
*without breaking *package_path*() methods.
* @usesCI_Loader::_ci_autoloader()
* @used-byCI_Controller::__construct()
* @returnvoid
*/
public function initialize()
{
$this->_ci_autoloader();
}
// --------------------------------------------------------------------
/**
* Is Loaded
*
* A utility method to test if a class is in the self::$_ci_classes array.
*
* @used-byMainly used by Form Helper function _get_validation_object().
*
* @param string$classClass name to check for
* @return string|boolClass object name if loaded or FALSE
*/
public function is_loaded($class)
{
return array_search(ucfirst($class), $this->_ci_classes, TRUE);
}
// --------------------------------------------------------------------
/**
* Library Loader
*
* Loads and instantiates libraries.
* Designed to be called from application controllers.
*
* @parammixed$libraryLibrary name
* @paramarray$paramsOptional parameters to pass to the library class constructor
* @paramstring$object_nameAn optional object name to assign to
* @returnobject
*/
public function library($library, $params = NULL, $object_name = NULL)
{
if (empty($library))
{
return $this;
}
elseif (is_array($library))
{
foreach ($library as $key => $value)
{
if (is_int($key))
{
$this->library($value, $params);
}
else
{
$this->library($key, $params, $value);
}
}
return $this;
}
if ($params !== NULL && ! is_array($params))
{
$params = NULL;
}
$this->_ci_load_library($library, $params, $object_name);
return $this;
}
// --------------------------------------------------------------------
/**
* Model Loader
*
* Loads and instantiates models.
*
* @parammixed$modelModel name
* @paramstring$nameAn optional object name to assign to
* @parambool$db_connAn optional database connection configuration to initialize
* @returnobject
*/
public function model($model, $name = '', $db_conn = FALSE)
{
if (empty($model))
{
return $this;
}
elseif (is_array($model))
{
foreach ($model as $key => $value)
{
is_int($key) ? $this->model($value, '', $db_conn) : $this->model($key, $value, $db_conn);
}
return $this;
}
$path = '';
// Is the model in a sub-folder? If so, parse out the filename and path.
if (($last_slash = strrpos($model, '/')) !== FALSE)
{
// The path is in front of the last slash
$path = substr($model, 0, ++$last_slash);
// And the model name behind it
$model = substr($model, $last_slash);
}
if (empty($name))
{
$name = $model;
}
if (in_array($name, $this->_ci_models, TRUE))
{
return $this;
}
$CI =& get_instance();
if (isset($CI->$name))
{
throw new RuntimeException('The model name you are loading is the name of a resource that is already being used: '.$name);
}
if ($db_conn !== FALSE && ! class_exists('CI_DB', FALSE))
{
if ($db_conn === TRUE)
{
$db_conn = '';
}
$this->database($db_conn, FALSE, TRUE);
}
// Note: All of the code under this condition used to be just:
//
// load_class('Model', 'core');
//
// However, load_class() instantiates classes
// to cache them for later use and that prevents
// MY_Model from being an abstract class and is
// sub-optimal otherwise anyway.
if ( ! class_exists('CI_Model', FALSE))
{
$app_path = APPPATH.'core'.DIRECTORY_SEPARATOR;
if (file_exists($app_path.'Model.php'))
{
require_once($app_path.'Model.php');
if ( ! class_exists('CI_Model', FALSE))
{
throw new RuntimeException($app_path."Model.php exists, but doesn't declare class CI_Model");
}
log_message('info', 'CI_Model class loaded');
}
elseif ( ! class_exists('CI_Model', FALSE))
{
require_once(BASEPATH.'core'.DIRECTORY_SEPARATOR.'Model.php');
}
$class = config_item('subclass_prefix').'Model';
if (file_exists($app_path.$class.'.php'))
{
require_once($app_path.$class.'.php');
if ( ! class_exists($class, FALSE))
{
throw new RuntimeException($app_path.$class.".php exists, but doesn't declare class ".$class);
}
log_message('info', config_item('subclass_prefix').'Model class loaded');
}
}
$model = ucfirst($model);
if ( ! class_exists($model, FALSE))
{
foreach ($this->_ci_model_paths as $mod_path)
{
if ( ! file_exists($mod_path.'models/'.$path.$model.'.php'))
{
continue;
}
require_once($mod_path.'models/'.$path.$model.'.php');
if ( ! class_exists($model, FALSE))
{
throw new RuntimeException($mod_path."models/".$path.$model.".php exists, but doesn't declare class ".$model);
}
break;
}
if ( ! class_exists($model, FALSE))
{
throw new RuntimeException('Unable to locate the model you have specified: '.$model);
}
}
elseif ( ! is_subclass_of($model, 'CI_Model'))
{
throw new RuntimeException("Class ".$model." already exists and doesn't extend CI_Model");
}
$this->_ci_models[] = $name;
$model = new $model();
$CI->$name = $model;
log_message('info', 'Model "'.get_class($model).'" initialized');
return $this;
}
// --------------------------------------------------------------------
/**
* Database Loader
*
* @parammixed$paramsDatabase configuration options
* @parambool$return Whether to return the database object
* @parambool$query_builderWhether to enable Query Builder
*(overrides the configuration setting)
*
* @returnobject|boolDatabase object if $return is set to TRUE,
*FALSE on failure, CI_Loader instance in any other case
*/
public function database($params = '', $return = FALSE, $query_builder = NULL)
{
// Grab the super object
$CI =& get_instance();
// Do we even need to load the database class?
if ($return === FALSE && $query_builder === NULL && isset($CI->db) && is_object($CI->db) && ! empty($CI->db->conn_id))
{
return FALSE;
}
require_once(BASEPATH.'database/DB.php');
if ($return === TRUE)
{
return DB($params, $query_builder);
}
// Initialize the db variable. Needed to prevent
// reference errors with some configurations
$CI->db = '';
// Load the DB class
$CI->db =& DB($params, $query_builder);
return $this;
}
// --------------------------------------------------------------------
/**
* Load the Database Utilities Class
*
* @paramobject$dbDatabase object
* @parambool$returnWhether to return the DB Utilities class object or not
* @returnobject
*/
public function dbutil($db = NULL, $return = FALSE)
{
$CI =& get_instance();
if ( ! is_object($db) OR ! ($db instanceof CI_DB))
{
class_exists('CI_DB', FALSE) OR $this->database();
$db =& $CI->db;
}
require_once(BASEPATH.'database/DB_utility.php');
require_once(BASEPATH.'database/drivers/'.$db->dbdriver.'/'.$db->dbdriver.'_utility.php');
$class = 'CI_DB_'.$db->dbdriver.'_utility';
if ($return === TRUE)
{
return new $class($db);
}
$CI->dbutil = new $class($db);
return $this;
}
// --------------------------------------------------------------------
/**
* Load the Database Forge Class
*
* @paramobject$dbDatabase object
* @parambool$returnWhether to return the DB Forge class object or not
* @returnobject
*/
public function dbforge($db = NULL, $return = FALSE)
{
$CI =& get_instance();
if ( ! is_object($db) OR ! ($db instanceof CI_DB))
{
class_exists('CI_DB', FALSE) OR $this->database();
$db =& $CI->db;
}
require_once(BASEPATH.'database/DB_forge.php');
require_once(BASEPATH.'database/drivers/'.$db->dbdriver.'/'.$db->dbdriver.'_forge.php');
if ( ! empty($db->subdriver))
{
$driver_path = BASEPATH.'database/drivers/'.$db->dbdriver.'/subdrivers/'.$db->dbdriver.'_'.$db->subdriver.'_forge.php';
if (file_exists($driver_path))
{
require_once($driver_path);
$class = 'CI_DB_'.$db->dbdriver.'_'.$db->subdriver.'_forge';
}
}
else
{
$class = 'CI_DB_'.$db->dbdriver.'_forge';
}
if ($return === TRUE)
{
return new $class($db);
}
$CI->dbforge = new $class($db);
return $this;
}
// --------------------------------------------------------------------
/**
* View Loader
*
* Loads "view" files.
*
* @paramstring$viewView name
* @paramarray$varsAn associative array of data
*to be extracted for use in the view
* @parambool$returnWhether to return the view output
*or leave it to the Output class
* @returnobject|string
*/
public function view($view, $vars = array(), $return = FALSE)
{
return $this->_ci_load(array('_ci_view' => $view, '_ci_vars' => $this->_ci_prepare_view_vars($vars), '_ci_return' => $return));
}
// --------------------------------------------------------------------
/**
* Generic File Loader
*
* @paramstring$pathFile path
* @parambool$returnWhether to return the file output
* @returnobject|string
*/
public function file($path, $return = FALSE)
{
return $this->_ci_load(array('_ci_path' => $path, '_ci_return' => $return));
}
// --------------------------------------------------------------------
/**
* Set Variables
*
* Once variables are set they become available within
* the controller class and its "view" files.
*
* @paramarray|object|string$vars
*An associative array or object containing values
*to be set, or a value's name if string
* @param string$valValue to set, only used if $vars is a string
* @returnobject
*/
public function vars($vars, $val = '')
{
$vars = is_string($vars)
? array($vars => $val)
: $this->_ci_prepare_view_vars($vars);
foreach ($vars as $key => $val)
{
$this->_ci_cached_vars[$key] = $val;
}
return $this;
}
// --------------------------------------------------------------------
/**
* Clear Cached Variables
*
* Clears the cached variables.
*
* @returnCI_Loader
*/
public function clear_vars()
{
$this->_ci_cached_vars = array();
return $this;
}
// --------------------------------------------------------------------
/**
* Get Variable
*
* Check if a variable is set and retrieve it.
*
* @paramstring$keyVariable name
* @returnmixedThe variable or NULL if not found
*/
public function get_var($key)
{
return isset($this->_ci_cached_vars[$key]) ? $this->_ci_cached_vars[$key] : NULL;
}
// --------------------------------------------------------------------
/**
* Get Variables
*
* Retrieves all loaded variables.
*
* @returnarray
*/
public function get_vars()
{
return $this->_ci_cached_vars;
}
// --------------------------------------------------------------------
/**
* Helper Loader
*
* @paramstring|string[]$helpersHelper name(s)
* @returnobject
*/
public function helper($helpers = array())
{
is_array($helpers) OR $helpers = array($helpers);
foreach ($helpers as &$helper)
{
$filename = basename($helper);
$filepath = ($filename === $helper) ? '' : substr($helper, 0, strlen($helper) - strlen($filename));
$filename = strtolower(preg_replace('#(_helper)?(\.php)?$#i', '', $filename)).'_helper';
$helper = $filepath.$filename;
if (isset($this->_ci_helpers[$helper]))
{
continue;
}
// Is this a helper extension request?
$ext_helper = config_item('subclass_prefix').$filename;
$ext_loaded = FALSE;
foreach ($this->_ci_helper_paths as $path)
{
if (file_exists($path.'helpers/'.$ext_helper.'.php'))
{
include_once($path.'helpers/'.$ext_helper.'.php');
$ext_loaded = TRUE;
}
}
// If we have loaded extensions - check if the base one is here
if ($ext_loaded === TRUE)
{
$base_helper = BASEPATH.'helpers/'.$helper.'.php';
if ( ! file_exists($base_helper))
{
show_error('Unable to load the requested file: helpers/'.$helper.'.php');
}
include_once($base_helper);
$this->_ci_helpers[$helper] = TRUE;
log_message('info', 'Helper loaded: '.$helper);
continue;
}
// No extensions found ... try loading regular helpers and/or overrides
foreach ($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('info', 'Helper loaded: '.$helper);
break;
}
}
// unable to load the helper
if ( ! isset($this->_ci_helpers[$helper]))
{
show_error('Unable to load the requested file: helpers/'.$helper.'.php');
}
}
return $this;
}
// --------------------------------------------------------------------
/**
* Load Helpers
*
* An alias for the helper() method in case the developer has
* written the plural form of it.
*
* @usesCI_Loader::helper()
* @paramstring|string[]$helpersHelper name(s)
* @returnobject
*/
public function helpers($helpers = array())
{
return $this->helper($helpers);
}
// --------------------------------------------------------------------
/**
* Language Loader
*
* Loads language files.
*
* @paramstring|string[]$filesList of language file names to load
* @paramstringLanguage name
* @returnobject
*/
public function language($files, $lang = '')
{
get_instance()->lang->load($files, $lang);
return $this;
}
// --------------------------------------------------------------------
/**
* Config Loader
*
* Loads a config file (an alias for CI_Config::load()).
*
* @usesCI_Config::load()
* @paramstring$fileConfiguration file name
* @parambool$use_sectionsWhether configuration values should be loaded into their own section
* @parambool$fail_gracefullyWhether to just return FALSE or display an error message
* @returnboolTRUE if the file was loaded correctly or FALSE on failure
*/
public function config($file, $use_sections = FALSE, $fail_gracefully = FALSE)
{
return get_instance()->config->load($file, $use_sections, $fail_gracefully);
}
// --------------------------------------------------------------------
/**
* Driver Loader
*
* Loads a driver library.
*
* @paramstring|string[]$libraryDriver name(s)
* @paramarray$paramsOptional parameters to pass to the driver
* @paramstring$object_nameAn optional object name to assign to
*
* @returnobject|boolObject or FALSE on failure if $library is a string
*and $object_name is set. CI_Loader instance otherwise.
*/
public function driver($library, $params = NULL, $object_name = NULL)
{
if (is_array($library))
{
foreach ($library as $key => $value)
{
if (is_int($key))
{
$this->driver($value, $params);
}
else
{
$this->driver($key, $params, $value);
}
}
return $this;
}
elseif (empty($library))
{
return FALSE;
}
if ( ! class_exists('CI_Driver_Library', FALSE))
{
// We aren't instantiating an object here, just making the base class available
require BASEPATH.'libraries/Driver.php';
}
// 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, $object_name);
}
// --------------------------------------------------------------------
/**
* Add Package Path
*
* Prepends a parent path to the library, model, helper and config
* path arrays.
*
* @seeCI_Loader::$_ci_library_paths
* @seeCI_Loader::$_ci_model_paths
* @see CI_Loader::$_ci_helper_paths
* @see CI_Config::$_config_paths
*
* @paramstring$pathPath to add
* @param bool$view_cascade(default: TRUE)
* @returnobject
*/
public function add_package_path($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;
// Add config file path
$config =& $this->_ci_get_component('config');
$config->_config_paths[] = $path;
return $this;
}
// --------------------------------------------------------------------
/**
* Get Package Paths
*
* Return a list of all package paths.
*
* @parambool$include_baseWhether to include BASEPATH (default: FALSE)
* @returnarray
*/
public function get_package_paths($include_base = FALSE)
{
return ($include_base === TRUE) ? $this->_ci_library_paths : $this->_ci_model_paths;
}
// --------------------------------------------------------------------
/**
* Remove Package Path
*
* Remove a path from the library, model, helper and/or config
* path arrays if it exists. If no path is provided, the most recently
* added path will be removed removed.
*
* @paramstring$pathPath to remove
* @returnobject
*/
public function remove_package_path($path = '')
{
$config =& $this->_ci_get_component('config');
if ($path === '')
{
array_shift($this->_ci_library_paths);
array_shift($this->_ci_model_paths);
array_shift($this->_ci_helper_paths);
array_shift($this->_ci_view_paths);
array_pop($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]);
}
}
// make sure the application default paths are still in the array
$this->_ci_library_paths = array_unique(array_merge($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)));
return $this;
}
// --------------------------------------------------------------------
/**
* Internal CI Data Loader
*
* Used to load views and files.
*
* Variables are prefixed with _ci_ to avoid symbol collision with
* variables made available to view files.
*
* @used-byCI_Loader::view()
* @used-byCI_Loader::file()
* @paramarray$_ci_dataData to load
* @returnobject
*/
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]) ? $_ci_data[$_ci_val] : FALSE;
}
$file_exists = FALSE;
// Set the path to the requested file
if (is_string($_ci_path) && $_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 $_ci_view_file => $cascade)
{
if (file_exists($_ci_view_file.$_ci_file))
{
$_ci_path = $_ci_view_file.$_ci_file;
$file_exists = TRUE;
break;
}
if ( ! $cascade)
{
break;
}
}
}
if ( ! $file_exists && ! file_exists($_ci_path))
{
show_error('Unable to load the requested file: '.$_ci_file);
}
// This allows anything loaded using $this->load (views, files, etc.)
// to become accessible from within the Controller and Model functions.
$_ci_CI =& get_instance();
foreach (get_object_vars($_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 $this->load->vars()
* function or via the second parameter of this function. We'll merge
* the two types and cache them so that views that are embedded within
* other views can have access to these variables.
*/
empty($_ci_vars) OR $this->_ci_cached_vars = array_merge($this->_ci_cached_vars, $_ci_vars);
extract($this->_ci_cached_vars);
/*
* Buffer the output
*
* 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.
*/
ob_start();
// 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.
if ( ! is_php('5.4') && ! ini_get('short_open_tag') && 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('info', 'File loaded: '.$_ci_path);
// Return the file data if requested
if ($_ci_return === TRUE)
{
$buffer = ob_get_contents();
@ob_end_clean();
return $buffer;
}
/*
* Flush the buffer... or buff the flusher?
*
* 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!
*/
if (ob_get_level() > $this->_ci_ob_level + 1)
{
ob_end_flush();
}
else
{
$_ci_CI->output->append_output(ob_get_contents());
@ob_end_clean();
}
return $this;
}
// --------------------------------------------------------------------
/**
* Internal CI Library Loader
*
* @used-byCI_Loader::library()
* @usesCI_Loader::_ci_init_library()
*
* @paramstring$classClass name to load
* @parammixed$paramsOptional parameters to pass to the class constructor
* @paramstring$object_nameOptional object name to assign to
* @returnvoid
*/
protected function _ci_load_library($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
$class = str_replace('.php', '', trim($class, '/'));
// Was the path included with the class name?
// We look for a slash to determine this
if (($last_slash = strrpos($class, '/')) !== FALSE)
{
// Extract the path
$subdir = substr($class, 0, ++$last_slash);
// Get the filename from the path
$class = substr($class, $last_slash);
}
else
{
$subdir = '';
}
$class = ucfirst($class);
// Is this a stock library? There are a few special conditions if so ...
if (file_exists(BASEPATH.'libraries/'.$subdir.$class.'.php'))
{
return $this->_ci_load_stock_library($class, $subdir, $params, $object_name);
}
// Safety: Was the class already loaded by a previous call?
if (class_exists($class, FALSE))
{
$property = $object_name;
if (empty($property))
{
$property = strtolower($class);
isset($this->_ci_varmap[$property]) && $property = $this->_ci_varmap[$property];
}
$CI =& get_instance();
if (isset($CI->$property))
{
log_message('debug', $class.' class already loaded. Second attempt ignored.');
return;
}
return $this->_ci_init_library($class, '', $params, $object_name);
}
// Let's search for the requested library file and load it.
foreach ($this->_ci_library_paths as $path)
{
// BASEPATH has already been checked for
if ($path === BASEPATH)
{
continue;
}
$filepath = $path.'libraries/'.$subdir.$class.'.php';
// Does the file exist? No? Bummer...
if ( ! file_exists($filepath))
{
continue;
}
include_once($filepath);
return $this->_ci_init_library($class, '', $params, $object_name);
}
// One last attempt. Maybe the library is in a subdirectory, but it wasn't specified?
if ($subdir === '')
{
return $this->_ci_load_library($class.'/'.$class, $params, $object_name);
}
// If we got this far we were unable to find the requested class.
log_message('error', 'Unable to load the requested class: '.$class);
show_error('Unable to load the requested class: '.$class);
}
// --------------------------------------------------------------------
/**
* Internal CI Stock Library Loader
*
* @used-byCI_Loader::_ci_load_library()
* @usesCI_Loader::_ci_init_library()
*
* @paramstring$library_nameLibrary name to load
* @paramstring$file_pathPath to the library filename, relative to libraries/
* @parammixed$paramsOptional parameters to pass to the class constructor
* @paramstring$object_nameOptional object name to assign to
* @returnvoid
*/
protected function _ci_load_stock_library($library_name, $file_path, $params, $object_name)
{
$prefix = 'CI_';
if (class_exists($prefix.$library_name, FALSE))
{
if (class_exists(config_item('subclass_prefix').$library_name, FALSE))
{
$prefix = config_item('subclass_prefix');
}
$property = $object_name;
if (empty($property))
{
$property = strtolower($library_name);
isset($this->_ci_varmap[$property]) && $property = $this->_ci_varmap[$property];
}
$CI =& get_instance();
if ( ! isset($CI->$property))
{
return $this->_ci_init_library($library_name, $prefix, $params, $object_name);
}
log_message('debug', $library_name.' class already loaded. Second attempt ignored.');
return;
}
$paths = $this->_ci_library_paths;
array_pop($paths); // BASEPATH
array_pop($paths); // APPPATH (needs to be the first path checked)
array_unshift($paths, APPPATH);
foreach ($paths as $path)
{
if (file_exists($path = $path.'libraries/'.$file_path.$library_name.'.php'))
{
// Override
include_once($path);
if (class_exists($prefix.$library_name, FALSE))
{
return $this->_ci_init_library($library_name, $prefix, $params, $object_name);
}
log_message('debug', $path.' exists, but does not declare '.$prefix.$library_name);
}
}
include_once(BASEPATH.'libraries/'.$file_path.$library_name.'.php');
// Check for extensions
$subclass = config_item('subclass_prefix').$library_name;
foreach ($paths as $path)
{
if (file_exists($path = $path.'libraries/'.$file_path.$subclass.'.php'))
{
include_once($path);
if (class_exists($subclass, FALSE))
{
$prefix = config_item('subclass_prefix');
break;
}
log_message('debug', $path.' exists, but does not declare '.$subclass);
}
}
return $this->_ci_init_library($library_name, $prefix, $params, $object_name);
}
// --------------------------------------------------------------------
/**
* Internal CI Library Instantiator
*
* @used-byCI_Loader::_ci_load_stock_library()
* @used-byCI_Loader::_ci_load_library()
*
* @paramstring$classClass name
* @paramstring$prefixClass name prefix
* @paramarray|null|bool$configOptional configuration to pass to the class constructor:
*FALSE to skip;
*NULL to search in config paths;
*array containing configuration data
* @paramstring$object_nameOptional object name to assign to
* @returnvoid
*/
protected function _ci_init_library($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))
{
$found = FALSE;
foreach ($config_component->_config_paths as $path)
{
// We test for both uppercase and lowercase, for servers that
// are case-sensitive with regard to file names. Load global first,
// override with environment next
if (file_exists($path.'config/'.strtolower($class).'.php'))
{
include($path.'config/'.strtolower($class).'.php');
$found = TRUE;
}
elseif (file_exists($path.'config/'.ucfirst(strtolower($class)).'.php'))
{
include($path.'config/'.ucfirst(strtolower($class)).'.php');
$found = TRUE;
}
if (file_exists($path.'config/'.ENVIRONMENT.'/'.strtolower($class).'.php'))
{
include($path.'config/'.ENVIRONMENT.'/'.strtolower($class).'.php');
$found = TRUE;
}
elseif (file_exists($path.'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php'))
{
include($path.'config/'.ENVIRONMENT.'/'.ucfirst(strtolower($class)).'.php');
$found = TRUE;
}
// Break on the first found configuration, thus package
// files are not overridden by default paths
if ($found === TRUE)
{
break;
}
}
}
}
$class_name = $prefix.$class;
// Is the class name valid?
if ( ! class_exists($class_name, FALSE))
{
log_message('error', 'Non-existent class: '.$class_name);
show_error('Non-existent class: '.$class_name);
}
// Set the variable name we will assign the class to
// Was a custom class name supplied? If so we'll use it
if (empty($object_name))
{
$object_name = strtolower($class);
if (isset($this->_ci_varmap[$object_name]))
{
$object_name = $this->_ci_varmap[$object_name];
}
}
// Don't overwrite existing properties
$CI =& get_instance();
if (isset($CI->$object_name))
{
if ($CI->$object_name instanceof $class_name)
{
log_message('debug', $class_name." has already been instantiated as '".$object_name."'. Second attempt aborted.");
return;
}
show_error("Resource '".$object_name."' already exists and is not a ".$class_name." instance.");
}
// Save the class name and object name
$this->_ci_classes[$object_name] = $class;
// Instantiate the class
$CI->$object_name = isset($config)
? new $class_name($config)
: new $class_name();
}
// --------------------------------------------------------------------
/**
* CI Autoloader
*
* Loads component listed in the config/autoload.php file.
*
* @used-byCI_Loader::initialize()
* @returnvoid
*/
protected function _ci_autoloader()
{
if (file_exists(APPPATH.'config/autoload.php'))
{
include(APPPATH.'config/autoload.php');
}
if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/autoload.php'))
{
include(APPPATH.'config/'.ENVIRONMENT.'/autoload.php');
}
if ( ! isset($autoload))
{
return;
}
// 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($autoload['config']) > 0)
{
foreach ($autoload['config'] as $val)
{
$this->config($val);
}
}
// Autoload helpers and languages
foreach (array('helper', 'language') as $type)
{
if (isset($autoload[$type]) && count($autoload[$type]) > 0)
{
$this->$type($autoload[$type]);
}
}
// Autoload drivers
if (isset($autoload['drivers']))
{
$this->driver($autoload['drivers']);
}
// Load libraries
if (isset($autoload['libraries']) && count($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
$this->library($autoload['libraries']);
}
// Autoload models
if (isset($autoload['model']))
{
$this->model($autoload['model']);
}
}
// --------------------------------------------------------------------
/**
* Prepare variables for _ci_vars, to be later extract()-ed inside views
*
* Converts objects to associative arrays and filters-out internal
* variable names (i.e. keys prefixed with '_ci_').
*
* @parammixed$vars
* @returnarray
*/
protected function _ci_prepare_view_vars($vars)
{
if ( ! is_array($vars))
{
$vars = is_object($vars)
? get_object_vars($vars)
: array();
}
foreach (array_keys($vars) as $key)
{
if (strncmp($key, '_ci_', 4) === 0)
{
unset($vars[$key]);
}
}
return $vars;
}
// --------------------------------------------------------------------
/**
* CI Component getter
*
* Get a reference to a specific library or model.
*
* @param string$componentComponent name
* @returnbool
*/
protected function &_ci_get_component($component)
{
$CI =& get_instance();
return $CI->$component;
}
}
来源：https://www.cnblogs.com/xuexijinbu/p/9204831.html