CI_Loader

Complexity

Total Complexity

168

Size/Duplication

Total Lines	1340
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	0

Importance

Changes

0

30 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	7	1
A	initialize()	0	4	1
A	is_loaded()	0	4	1
C	library()	0	31	7
F	model()	0	78	22
C	database()	0	26	7
B	dbutil()	0	22	5
C	dbforge()	0	34	7
A	view()	0	4	1
A	file()	0	4	1
A	vars()	0	19	3
A	clear_vars()	0	5	1
A	get_var()	0	4	2
A	get_vars()	0	4	1
C	helper()	0	58	12
A	helpers()	0	4	1
A	language()	0	5	1
A	config()	0	4	1
C	driver()	0	31	7
A	add_package_path()	0	16	1
A	get_package_paths()	0	4	2
B	remove_package_path()	0	43	6
F	_ci_load()	0	123	19
C	_ci_load_library()	0	79	11
C	_ci_load_stock_library()	0	72	10
F	_ci_init_library()	0	89	15
F	_ci_autoloader()	0	76	16
A	_ci_object_to_array()	0	4	2
A	_ci_get_component()	0	5	1
A	_ci_prep_filename()	0	16	3

<?php

For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 51 and the first side effect is on line 38.

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2015, 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. (http://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	http://codeigniter.com
 * @since	Version 1.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

Using logical operators such as or instead of || is generally not recommended.

/**
 * Loader Class (Modified by ci-phpunit-test)
 *
 * Loads framework components.
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Loader
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/libraries/loader.html
 */
class CI_Loader {

PSR1 recommends that each class must be in a namespace of at least one level to avoid collisions.

	// 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

Adding a @return annotation to constructors is generally not recommended as a constructor does not have a meaningful return value.

	 */
	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	$db_conn	An optional database connection configuration to initialize
	 * @return	object
	 * 
	 * modified by ci-phpunit-test
	 */
	public function model($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->$name))
		{
			show_error('The model name you are loading is the name of a resource that is already being used: '.$name);
		}

		if ($db_conn !== FALSE && ! class_exists('CI_DB', FALSE))
		{
			if ($db_conn === TRUE)
			{
				$db_conn = '';
			}

			$this->database($db_conn, FALSE, TRUE);
		}

//		if ( ! class_exists('CI_Model', FALSE))

56% of this comment could be valid code. Did you maybe forget this after debugging?

//		{
			load_class('Model', 'core');
//		}

		$model = ucfirst(strtolower($model));

		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');

			$this->_ci_models[] = $name;
			$CI->$name = new $model();
			return $this;
		}

		// couldn't find the model
		show_error('Unable to locate the model you have specified: '.$model);
	}

	// --------------------------------------------------------------------

	/**
	 * 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))

The class CI_DB does not exist. Did you forget a USE statement, or did you not list all dependencies?

Using logical operators such as or instead of || is generally not recommended.

		{
			class_exists('CI_DB', FALSE) OR $this->database();

Using logical operators such as or instead of || is generally not recommended.

			$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))

The class CI_DB does not exist. Did you forget a USE statement, or did you not list all dependencies?

Using logical operators such as or instead of || is generally not recommended.

		{
			class_exists('CI_DB', FALSE) OR $this->database();

Using logical operators such as or instead of || is generally not recommended.

			$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);

The variable $class does not seem to be defined for all execution paths leading up to this point.

		}

		$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' => $this->_ci_object_to_array($vars), '_ci_return' => $return));

$vars is of type array, but the function expects a object.

	}

	// --------------------------------------------------------------------

	/**
	 * 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, $val = '')
	{
		if (is_string($vars))
		{
			$vars = array($vars => $val);
		}

		$vars = $this->_ci_object_to_array($vars);

It seems like $vars defined by $this->_ci_object_to_array($vars) on line 485 can also be of type array; however, CI_Loader::_ci_object_to_array() does only seem to accept object, maybe add an additional type check?

		if (is_array($vars) && count($vars) > 0)
		{
			foreach ($vars as $key => $val)
			{
				$this->_ci_cached_vars[$key] = $val;
			}
		}

		return $this;
	}

	// --------------------------------------------------------------------

	/**
	 * Clear Cached Variables
	 *
	 * Clears the cached variables.
	 *
	 * @return  object
	 */
	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())
	{
		foreach ($this->_ci_prep_filename($helpers, '_helper') as $helper)
		{
			if (isset($this->_ci_helpers[$helper]))
			{
				continue;
			}

			// Is this a helper extension request?
			$ext_helper = config_item('subclass_prefix').$helper;
			$ext_loaded = FALSE;
			foreach ($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.
	 *
	 * @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 $driver)
			{
				$this->driver($driver);
			}

			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.
	 *
	 * @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 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 !== '')

The variable $_ci_path seems only to be defined at a later point. Did you maybe move this code here without moving the variable definition?

		{
			$_ci_x = explode('/', $_ci_path);

The variable $_ci_path seems only to be defined at a later point. Did you maybe move this code here without moving the variable definition?

			$_ci_file = end($_ci_x);
		}
		else
		{
			$_ci_ext = pathinfo($_ci_view, PATHINFO_EXTENSION);

The variable $_ci_view does not exist. Did you forget to declare it?

			$_ci_file = ($_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))

The variable $_ci_path does not seem to be defined for all execution paths leading up to this point.

		{
			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 $this->load->vars()
		 * function or via the second parameter of this function. We'll merge
		 * the two types and cache them so that views that are embedded within
		 * other views can have access to these variables.
		 */
		if (is_array($_ci_vars))
		{
			$this->_ci_cached_vars = array_merge($this->_ci_cached_vars, $_ci_vars);

The variable $_ci_vars does not exist. Did you forget to declare it?

		}
		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 && function_usable('eval'))
		{
			echo eval('?>'.preg_replace('/;*\s*\?>/', '; ?>', str_replace('<?=', '<?php echo ', file_get_contents($_ci_path))));

It is generally not recommended to use eval unless absolutely required.

		}
		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();

It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended.

			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();

It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended.

		}

		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	$object_name	Optional object name to assign to
	 * @return	void
	 * 
	 * modified by ci-phpunit-test
	 */
	protected function _ci_load_library($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);
		}

		// 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';

			// Safety: Was the class already loaded by a previous call?
//			if (class_exists($class, FALSE))
//			{
				// Before we deem this to be a duplicate request, let's see
				// if a custom object name is being supplied. If so, we'll
				// return a new instance of the object
				if ($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.');

56% of this comment could be valid code. Did you maybe forget this after debugging?

//				return;
//			}
			// 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-by	CI_Loader::_ci_load_library()
	 * @uses	CI_Loader::_ci_init_library()
	 *
	 * @param	string	$library	Library name to load

There is no parameter named $library. Did you maybe mean $library_name?

	 * @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	$object_name	Optional object name to assign to
	 * @return	void
	 * 
	 * modified by ci-phpunit-test
	 */
	protected function _ci_load_stock_library($library_name, $file_path, $params, $object_name)
	{
		$prefix = 'CI_';

//		if (class_exists($prefix.$library_name, FALSE))

65% of this comment could be valid code. Did you maybe forget this after debugging?

		{
			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 object
			if ($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.');

60% of this comment could be valid code. Did you maybe forget this after debugging?

//			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))

65% of this comment could be valid code. Did you maybe forget this after debugging?

				{
					return $this->_ci_init_library($library_name, $prefix, $params, $object_name);
				}
//				else

50% of this comment could be valid code. Did you maybe forget this after debugging?

//				{
//					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))
				{
					$prefix = config_item('subclass_prefix');
					break;
				}
				else
				{
					log_message('debug', APPPATH.'libraries/'.$file_path.$subclass.'.php exists, but does not declare '.$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, $object_name = NULL)
	{
		// Is there an associated config file for this class? Note: these should always be lowercase
		if ($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-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))

The variable $autoload seems only to be defined at a later point. As such the call to isset() seems to always evaluate to false.

		{
			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($autoload['drivers']))
		{
			foreach ($autoload['drivers'] as $item)
			{
				$this->driver($item);
			}
		}

		// 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
			foreach ($autoload['libraries'] as $item)
			{
				$this->library($item);
			}
		}

		// Autoload models
		if (isset($autoload['model']))
		{
			$this->model($autoload['model']);

$autoload['model'] is of type array, but the function expects a string.

		}
	}

	// --------------------------------------------------------------------

	/**
	 * CI Object to Array translator
	 *
	 * Takes an object as input and converts the class variables to
	 * an associative array with key/value pairs.
	 *
	 * @param	object	$object	Object data to translate
	 * @return	array
	 */
	protected function _ci_object_to_array($object)
	{
		return is_object($object) ? get_object_vars($object) : $object;
	}

	// --------------------------------------------------------------------

	/**
	 * 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;
	}

	// --------------------------------------------------------------------

	/**
	 * Prep filename
	 *
	 * This function prepares filenames of various items to
	 * make their loading more reliable.
	 *
	 * @param	string|string[]	$filename	Filename(s)
	 * @param 	string		$extension	Filename extension
	 * @return	array
	 */
	protected function _ci_prep_filename($filename, $extension)
	{
		if ( ! is_array($filename))
		{
			return array(strtolower(str_replace(array($extension, '.php'), '', $filename).$extension));
		}
		else
		{
			foreach ($filename as $key => $val)
			{
				$filename[$key] = strtolower(str_replace(array($extension, '.php'), '', $val).$extension);
			}

			return $filename;
		}
	}

}