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<?php/*** CodeIgniter** An open source application development framework for PHP** This content is released under the MIT License (MIT)** Copyright (c) 2014 - 2017, 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.** @package CodeIgniter* @author EllisLab Dev Team* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)* @copyright Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)* @license http://opensource.org/licenses/MIT MIT License* @link https://codeigniter.com* @since Version 1.0.0* @filesource*/defined('BASEPATH') OR exit('No direct script access allowed');/*** Loader Class** Loads framework components.** @package CodeIgniter* @subpackage Libraries* @category Loader* @author EllisLab Dev Team* @link https://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** @var int*/protected $_ci_ob_level;/*** List of paths to load views from** @var array*/protected $_ci_view_paths = array(VIEWPATH => TRUE);/*** List of paths to load libraries from** @var array*/protected $_ci_library_paths = array(APPPATH, BASEPATH);/*** List of paths to load models from** @var array*/protected $_ci_model_paths = array(APPPATH);/*** List of paths to load helpers from** @var array*/protected $_ci_helper_paths = array(APPPATH, BASEPATH);/*** List of cached variables** @var array*/protected $_ci_cached_vars = array();/*** List of loaded classes** @var array*/protected $_ci_classes = array();/*** List of loaded models** @var array*/protected $_ci_models = array();/*** List of loaded helpers** @var array*/protected $_ci_helpers = array();/*** List of class name mappings** @var array*/protected $_ci_varmap = array('unit_test' => 'unit','user_agent' => 'agent');// --------------------------------------------------------------------/*** Class constructor** Sets component load paths, gets the initial output buffering level.** @return void*/public function __construct(){$this->_ci_ob_level = ob_get_level();$this->_ci_classes =& is_loaded();log_message('info', 'Loader Class Initialized');}// --------------------------------------------------------------------/*** Initializer** @todo Figure out a way to move this to the constructor* without breaking *package_path*() methods.* @uses CI_Loader::_ci_autoloader()* @used-by CI_Controller::__construct()* @return void*/public function initialize(){$this->_ci_autoloader();}// --------------------------------------------------------------------/*** Is Loaded** A utility method to test if a class is in the self::$_ci_classes array.** @used-by Mainly used by Form Helper function _get_validation_object().** @param string $class Class name to check for* @return string|bool Class object name if loaded or FALSE*/public function is_loaded($class){return array_search(ucfirst($class), $this->_ci_classes, TRUE);}// --------------------------------------------------------------------/*** Library Loader** Loads and instantiates libraries.* Designed to be called from application controllers.** @param string $library Library name* @param array $params Optional parameters to pass to the library class constructor* @param string $object_name An optional object name to assign to* @return object*/public function library($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.** @param string $model Model name* @param string $name An optional object name to assign to* @param bool $db_conn An optional database connection configuration to initialize* @return object*/public function model($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");}}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 ".$class);}}}$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[] = $name;$CI->$name = new $model();return $this;}// --------------------------------------------------------------------/*** Database Loader** @param mixed $params Database configuration options* @param bool $return Whether to return the database object* @param bool $query_builder Whether to enable Query Builder* (overrides the configuration setting)** @return object|bool Database 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** @param object $db Database object* @param bool $return Whether to return the DB Utilities class object or not* @return object*/public function dbutil($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** @param object $db Database object* @param bool $return Whether to return the DB Forge class object or not* @return object*/public function dbforge($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.** @param string $view View name* @param array $vars An associative array of data* to be extracted for use in the view* @param bool $return Whether to return the view output* or leave it to the Output class* @return object|string*/public function view($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** @param string $path File path* @param bool $return Whether to return the file output* @return object|string*/public function file($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.** @param array|object|string $vars* An associative array or object containing values* to be set, or a value's name if string* @param string $val Value to set, only used if $vars is a string* @return object*/public function vars($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 $this;}// --------------------------------------------------------------------/*** Clear Cached Variables** Clears the cached variables.** @return CI_Loader*/public function clear_vars(){$this->_ci_cached_vars = array();return $this;}// --------------------------------------------------------------------/*** Get Variable** Check if a variable is set and retrieve it.** @param string $key Variable name* @return mixed The variable or NULL if not found*/public function get_var($key){return isset($this->_ci_cached_vars[$key]) ? $this->_ci_cached_vars[$key] : NULL;}// --------------------------------------------------------------------/*** Get Variables** Retrieves all loaded variables.** @return array*/public function get_vars(){return $this->_ci_cached_vars;}// --------------------------------------------------------------------/*** Helper Loader** @param string|string[] $helpers Helper name(s)* @return object*/public function helper($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 hereif ($ext_loaded === TRUE){$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: '.$helper);continue;}// No extensions found ... try loading regular helpers and/or overridesforeach ($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 helperif ( ! 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.** @uses CI_Loader::helper()* @param string|string[] $helpers Helper name(s)* @return object*/public function helpers($helpers = array()){return $this->helper($helpers);}// --------------------------------------------------------------------/*** Language Loader** Loads language files.** @param string|string[] $files List of language file names to load* @param string Language name* @return object*/public function language($files, $lang = ''){get_instance()->lang->load($files, $lang);return $this;}// --------------------------------------------------------------------/*** Config Loader** Loads a config file (an alias for CI_Config::load()).** @uses CI_Config::load()* @param string $file Configuration file name* @param bool $use_sections Whether configuration values should be loaded into their own section* @param bool $fail_gracefully Whether to just return FALSE or display an error message* @return bool TRUE if the file was loaded correctly or FALSE on failure*/public function config($file, $use_sections = FALSE, $fail_gracefully = FALSE){return get_instance()->config->load($file, $use_sections, $fail_gracefully);}// --------------------------------------------------------------------/*** Driver Loader** Loads a driver library.** @param string|string[] $library Driver name(s)* @param array $params Optional parameters to pass to the driver* @param string $object_name An optional object name to assign to** @return object|bool Object 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 availablerequire 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 libraryif ( ! strpos($library, '/')){$library = ucfirst($library).'/'.$library;}return $this->library($library, $params, $object_name);}// --------------------------------------------------------------------/*** Add Package Path** Prepends a parent path to the library, model, helper and config* path arrays.** @see CI_Loader::$_ci_library_paths* @see CI_Loader::$_ci_model_paths* @see CI_Loader::$_ci_helper_paths* @see CI_Config::$_config_paths** @param string $path Path to add* @param bool $view_cascade (default: TRUE)* @return object*/public function add_package_path($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.** @param bool $include_base Whether to include BASEPATH (default: FALSE)* @return array*/public function get_package_paths($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.** @param string $path Path to remove* @return object*/public function remove_package_path($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-by CI_Loader::view()* @used-by CI_Loader::file()* @param array $_ci_data Data to load* @return object*/protected function _ci_load($_ci_data){// Set the default data variablesforeach (array('_ci_view', '_ci_vars', '_ci_path', '_ci_return') as $_ci_val){$$_ci_val = isset($_ci_data[$_ci_val]) ? $_ci_data[$_ci_val] : FALSE;}$file_exists = FALSE;// Set the path to the requested fileif (is_string($_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: '.$_ci_path);// Return the file data if requestedif ($_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-by CI_Loader::library()* @uses CI_Loader::_ci_init_library()** @param string $class Class name to load* @param mixed $params Optional parameters to pass to the class constructor* @param string $object_name Optional object name to assign to* @return void*/protected function _ci_load_library($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($class, '/'));// Was the path included with the class name?// We look for a slash to determine thisif (($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, $object_name);}// Let's search for the requested library file and load it.foreach ($this->_ci_library_paths as $path){// BASEPATH has already been checked forif ($path === BASEPATH){continue;}$filepath = $path.'libraries/'.$subdir.$class.'.php';// Safety: Was the class already loaded by a previous call?if (class_exists($class, FALSE)){// 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 objectif ($object_name !== NULL){$CI =& get_instance();if ( ! isset($CI->$object_name)){return $this->_ci_init_library($class, '', $params, $object_name);}}log_message('debug', $class.' class already loaded. Second attempt ignored.');return;}// Does the file exist? No? Bummer...elseif ( ! file_exists($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-by CI_Loader::_ci_load_library()* @uses CI_Loader::_ci_init_library()** @param string $library_name Library name to load* @param string $file_path Path to the library filename, relative to libraries/* @param mixed $params Optional parameters to pass to the class constructor* @param string $object_name Optional object name to assign to* @return void*/protected function _ci_load_stock_library($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');}// 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 objectif ($object_name !== NULL){$CI =& get_instance();if ( ! isset($CI->$object_name)){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); // BASEPATHarray_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.$library_name.'.php')){// Overrideinclude_once($path);if (class_exists($prefix.$library_name, FALSE)){return $this->_ci_init_library($library_name, $prefix, $params, $object_name);}else{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;}else{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-by CI_Loader::_ci_load_stock_library()* @used-by CI_Loader::_ci_load_library()** @param string $class Class name* @param string $prefix Class name prefix* @param array|null|bool $config Optional configuration to pass to the class constructor:* FALSE to skip;* NULL to search in config paths;* array containing configuration data* @param string $object_name Optional object name to assign to* @return void*/protected function _ci_init_library($class, $prefix, $config = FALSE, $object_name = NULL){// Is there an associated config file for this class? Note: these should always be lowercaseif ($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 $path){// We test for both uppercase and lowercase, for servers that// are case-sensitive with regard to file names. Load global first,// override with environment nextif (file_exists($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');$found = TRUE;}// Break on the first found configuration, thus package// files are not overridden by default pathsif ($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: '.$class_name);}// Set the variable name we will assign the class to// Was a custom class name supplied? If so we'll use itif (empty($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 $class_name();}// --------------------------------------------------------------------/*** CI Autoloader** Loads component listed in the config/autoload.php file.** @used-by CI_Loader::initialize()* @return void*/protected function _ci_autoloader(){if (file_exists(APPPATH.'config/autoload.php')){include(APPPATH.'config/autoload.php');}if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/autoload.php')){include(APPPATH.'config/'.ENVIRONMENT.'/autoload.php');}if ( ! isset($autoload)){return;}// Autoload packagesif (isset($autoload['packages'])){foreach ($autoload['packages'] as $package_path){$this->add_package_path($package_path);}}// Load any custom config fileif (count($autoload['config']) > 0){foreach ($autoload['config'] as $val){$this->config($val);}}// Autoload helpers and languagesforeach (array('helper', 'language') as $type){if (isset($autoload[$type]) && count($autoload[$type]) > 0){$this->$type($autoload[$type]);}}// Autoload driversif (isset($autoload['drivers'])){$this->driver($autoload['drivers']);}// Load librariesif (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 modelsif (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 prexied with '_ci_').** @param mixed $vars* @return array*/protected function _ci_prepare_view_vars($vars){if ( ! is_array($vars)){$vars = is_object($vars)? get_object_vars($object): 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 $component Component name* @return bool*/protected function &_ci_get_component($component){$CI =& get_instance();return $CI->$component;}}