system/core/CodeIgniter.php - code-igniter-v3-giggi - Gitiles

 <?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.
  *
  * @package	CodeIgniter
  * @author	EllisLab Dev Team
  * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
  * @copyright	Copyright (c) 2014 - 2018, 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');

 /**
  * System Initialization File
  *
  * Loads the base classes and executes the request.
  *
  * @package		CodeIgniter
  * @subpackage	CodeIgniter
  * @category	Front-controller
  * @author		EllisLab Dev Team
  * @link		https://codeigniter.com/user_guide/
  */

 /**
  * CodeIgniter Version
  *
  * @var	string
  *
  */
 	const CI_VERSION = '3.1.8';

 /*
  * ------------------------------------------------------
  *  Load the framework constants
  * ------------------------------------------------------
  */
 	if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/constants.php'))
 	{
 		require_once(APPPATH.'config/'.ENVIRONMENT.'/constants.php');
 	}

 	if (file_exists(APPPATH.'config/constants.php'))
 	{
 		require_once(APPPATH.'config/constants.php');
 	}

 /*
  * ------------------------------------------------------
  *  Load the global functions
  * ------------------------------------------------------
  */
 	require_once(BASEPATH.'core/Common.php');


 /*
  * ------------------------------------------------------
  * Security procedures
  * ------------------------------------------------------
  */

 if ( ! is_php('5.4'))
 {
 	ini_set('magic_quotes_runtime', 0);

 	if ((bool) ini_get('register_globals'))
 	{
 		$_protected = array(
 			'_SERVER',
 			'_GET',
 			'_POST',
 			'_FILES',
 			'_REQUEST',
 			'_SESSION',
 			'_ENV',
 			'_COOKIE',
 			'GLOBALS',
 			'HTTP_RAW_POST_DATA',
 			'system_path',
 			'application_folder',
 			'view_folder',
 			'_protected',
 			'_registered'
 		);

 		$_registered = ini_get('variables_order');
 		foreach (array('E' => '_ENV', 'G' => '_GET', 'P' => '_POST', 'C' => '_COOKIE', 'S' => '_SERVER') as $key => $superglobal)
 		{
 			if (strpos($_registered, $key) === FALSE)
 			{
 				continue;
 			}

 			foreach (array_keys($$superglobal) as $var)
 			{
 				if (isset($GLOBALS[$var]) && ! in_array($var, $_protected, TRUE))
 				{
 					$GLOBALS[$var] = NULL;
 				}
 			}
 		}
 	}
 }


 /*
  * ------------------------------------------------------
  *  Define a custom error handler so we can log PHP errors
  * ------------------------------------------------------
  */
 	set_error_handler('_error_handler');
 	set_exception_handler('_exception_handler');
 	register_shutdown_function('_shutdown_handler');

 /*
  * ------------------------------------------------------
  *  Set the subclass_prefix
  * ------------------------------------------------------
  *
  * Normally the "subclass_prefix" is set in the config file.
  * The subclass prefix allows CI to know if a core class is
  * being extended via a library in the local application
  * "libraries" folder. Since CI allows config items to be
  * overridden via data set in the main index.php file,
  * before proceeding we need to know if a subclass_prefix
  * override exists. If so, we will set this value now,
  * before any classes are loaded
  * Note: Since the config file data is cached it doesn't
  * hurt to load it here.
  */
 	if ( ! empty($assign_to_config['subclass_prefix']))
 	{
 		get_config(array('subclass_prefix' => $assign_to_config['subclass_prefix']));
 	}

 /*
  * ------------------------------------------------------
  *  Should we use a Composer autoloader?
  * ------------------------------------------------------
  */
 	if ($composer_autoload = config_item('composer_autoload'))
 	{
 		if ($composer_autoload === TRUE)
 		{
 			file_exists(APPPATH.'vendor/autoload.php')
 				? require_once(APPPATH.'vendor/autoload.php')
 				: log_message('error', '$config[\'composer_autoload\'] is set to TRUE but '.APPPATH.'vendor/autoload.php was not found.');
 		}
 		elseif (file_exists($composer_autoload))
 		{
 			require_once($composer_autoload);
 		}
 		else
 		{
 			log_message('error', 'Could not find the specified $config[\'composer_autoload\'] path: '.$composer_autoload);
 		}
 	}

 /*
  * ------------------------------------------------------
  *  Start the timer... tick tock tick tock...
  * ------------------------------------------------------
  */
 	$BM =& load_class('Benchmark', 'core');
 	$BM->mark('total_execution_time_start');
 	$BM->mark('loading_time:_base_classes_start');

 /*
  * ------------------------------------------------------
  *  Instantiate the hooks class
  * ------------------------------------------------------
  */
 	$EXT =& load_class('Hooks', 'core');

 /*
  * ------------------------------------------------------
  *  Is there a "pre_system" hook?
  * ------------------------------------------------------
  */
 	$EXT->call_hook('pre_system');

 /*
  * ------------------------------------------------------
  *  Instantiate the config class
  * ------------------------------------------------------
  *
  * Note: It is important that Config is loaded first as
  * most other classes depend on it either directly or by
  * depending on another class that uses it.
  *
  */
 	$CFG =& load_class('Config', 'core');

 	// Do we have any manually set config items in the index.php file?
 	if (isset($assign_to_config) && is_array($assign_to_config))
 	{
 		foreach ($assign_to_config as $key => $value)
 		{
 			$CFG->set_item($key, $value);
 		}
 	}

 /*
  * ------------------------------------------------------
  * Important charset-related stuff
  * ------------------------------------------------------
  *
  * Configure mbstring and/or iconv if they are enabled
  * and set MB_ENABLED and ICONV_ENABLED constants, so
  * that we don't repeatedly do extension_loaded() or
  * function_exists() calls.
  *
  * Note: UTF-8 class depends on this. It used to be done
  * in it's constructor, but it's _not_ class-specific.
  *
  */
 	$charset = strtoupper(config_item('charset'));
 	ini_set('default_charset', $charset);

 	if (extension_loaded('mbstring'))
 	{
 		define('MB_ENABLED', TRUE);
 		// mbstring.internal_encoding is deprecated starting with PHP 5.6
 		// and it's usage triggers E_DEPRECATED messages.
 		@ini_set('mbstring.internal_encoding', $charset);
 		// This is required for mb_convert_encoding() to strip invalid characters.
 		// That's utilized by CI_Utf8, but it's also done for consistency with iconv.
 		mb_substitute_character('none');
 	}
 	else
 	{
 		define('MB_ENABLED', FALSE);
 	}

 	// There's an ICONV_IMPL constant, but the PHP manual says that using
 	// iconv's predefined constants is "strongly discouraged".
 	if (extension_loaded('iconv'))
 	{
 		define('ICONV_ENABLED', TRUE);
 		// iconv.internal_encoding is deprecated starting with PHP 5.6
 		// and it's usage triggers E_DEPRECATED messages.
 		@ini_set('iconv.internal_encoding', $charset);
 	}
 	else
 	{
 		define('ICONV_ENABLED', FALSE);
 	}

 	if (is_php('5.6'))
 	{
 		ini_set('php.internal_encoding', $charset);
 	}

 /*
  * ------------------------------------------------------
  *  Load compatibility features
  * ------------------------------------------------------
  */

 	require_once(BASEPATH.'core/compat/mbstring.php');
 	require_once(BASEPATH.'core/compat/hash.php');
 	require_once(BASEPATH.'core/compat/password.php');
 	require_once(BASEPATH.'core/compat/standard.php');

 /*
  * ------------------------------------------------------
  *  Instantiate the UTF-8 class
  * ------------------------------------------------------
  */
 	$UNI =& load_class('Utf8', 'core');

 /*
  * ------------------------------------------------------
  *  Instantiate the URI class
  * ------------------------------------------------------
  */
 	$URI =& load_class('URI', 'core');

 /*
  * ------------------------------------------------------
  *  Instantiate the routing class and set the routing
  * ------------------------------------------------------
  */
 	$RTR =& load_class('Router', 'core', isset($routing) ? $routing : NULL);

 /*
  * ------------------------------------------------------
  *  Instantiate the output class
  * ------------------------------------------------------
  */
 	$OUT =& load_class('Output', 'core');

 /*
  * ------------------------------------------------------
  *	Is there a valid cache file? If so, we're done...
  * ------------------------------------------------------
  */
 	if ($EXT->call_hook('cache_override') === FALSE && $OUT->_display_cache($CFG, $URI) === TRUE)
 	{
 		exit;
 	}

 /*
  * -----------------------------------------------------
  * Load the security class for xss and csrf support
  * -----------------------------------------------------
  */
 	$SEC =& load_class('Security', 'core');

 /*
  * ------------------------------------------------------
  *  Load the Input class and sanitize globals
  * ------------------------------------------------------
  */
 	$IN	=& load_class('Input', 'core');

 /*
  * ------------------------------------------------------
  *  Load the Language class
  * ------------------------------------------------------
  */
 	$LANG =& load_class('Lang', 'core');

 /*
  * ------------------------------------------------------
  *  Load the app controller and local controller
  * ------------------------------------------------------
  *
  */
 	// Load the base controller class
 	require_once BASEPATH.'core/Controller.php';

 	/**
 	 * Reference to the CI_Controller method.
 	 *
 	 * Returns current CI instance object
 	 *
 	 * @return CI_Controller
 	 */
 	function &get_instance()
 	{
 		return CI_Controller::get_instance();
 	}

 	if (file_exists(APPPATH.'core/'.$CFG->config['subclass_prefix'].'Controller.php'))
 	{
 		require_once APPPATH.'core/'.$CFG->config['subclass_prefix'].'Controller.php';
 	}

 	// Set a mark point for benchmarking
 	$BM->mark('loading_time:_base_classes_end');

 /*
  * ------------------------------------------------------
  *  Sanity checks
  * ------------------------------------------------------
  *
  *  The Router class has already validated the request,
  *  leaving us with 3 options here:
  *
  *	1) an empty class name, if we reached the default
  *	   controller, but it didn't exist;
  *	2) a query string which doesn't go through a
  *	   file_exists() check
  *	3) a regular request for a non-existing page
  *
  *  We handle all of these as a 404 error.
  *
  *  Furthermore, none of the methods in the app controller
  *  or the loader class can be called via the URI, nor can
  *  controller methods that begin with an underscore.
  */

 	$e404 = FALSE;
 	$class = ucfirst($RTR->class);
 	$method = $RTR->method;

 	if (empty($class) OR ! file_exists(APPPATH.'controllers/'.$RTR->directory.$class.'.php'))
 	{
 		$e404 = TRUE;
 	}
 	else
 	{
 		require_once(APPPATH.'controllers/'.$RTR->directory.$class.'.php');

 		if ( ! class_exists($class, FALSE) OR $method[0] === '_' OR method_exists('CI_Controller', $method))
 		{
 			$e404 = TRUE;
 		}
 		elseif (method_exists($class, '_remap'))
 		{
 			$params = array($method, array_slice($URI->rsegments, 2));
 			$method = '_remap';
 		}
 		elseif ( ! method_exists($class, $method))
 		{
 			$e404 = TRUE;
 		}
 		/**
 		 * DO NOT CHANGE THIS, NOTHING ELSE WORKS!
 		 *
 		 * - method_exists() returns true for non-public methods, which passes the previous elseif
 		 * - is_callable() returns false for PHP 4-style constructors, even if there's a __construct()
 		 * - method_exists($class, '__construct') won't work because CI_Controller::__construct() is inherited
 		 * - People will only complain if this doesn't work, even though it is documented that it shouldn't.
 		 *
 		 * ReflectionMethod::isConstructor() is the ONLY reliable check,
 		 * knowing which method will be executed as a constructor.
 		 */
 		elseif ( ! is_callable(array($class, $method)))
 		{
 			$reflection = new ReflectionMethod($class, $method);
 			if ( ! $reflection->isPublic() OR $reflection->isConstructor())
 			{
 				$e404 = TRUE;
 			}
 		}
 	}

 	if ($e404)
 	{
 		if ( ! empty($RTR->routes['404_override']))
 		{
 			if (sscanf($RTR->routes['404_override'], '%[^/]/%s', $error_class, $error_method) !== 2)
 			{
 				$error_method = 'index';
 			}

 			$error_class = ucfirst($error_class);

 			if ( ! class_exists($error_class, FALSE))
 			{
 				if (file_exists(APPPATH.'controllers/'.$RTR->directory.$error_class.'.php'))
 				{
 					require_once(APPPATH.'controllers/'.$RTR->directory.$error_class.'.php');
 					$e404 = ! class_exists($error_class, FALSE);
 				}
 				// Were we in a directory? If so, check for a global override
 				elseif ( ! empty($RTR->directory) && file_exists(APPPATH.'controllers/'.$error_class.'.php'))
 				{
 					require_once(APPPATH.'controllers/'.$error_class.'.php');
 					if (($e404 = ! class_exists($error_class, FALSE)) === FALSE)
 					{
 						$RTR->directory = '';
 					}
 				}
 			}
 			else
 			{
 				$e404 = FALSE;
 			}
 		}

 		// Did we reset the $e404 flag? If so, set the rsegments, starting from index 1
 		if ( ! $e404)
 		{
 			$class = $error_class;
 			$method = $error_method;

 			$URI->rsegments = array(
 				1 => $class,
 				2 => $method
 			);
 		}
 		else
 		{
 			show_404($RTR->directory.$class.'/'.$method);
 		}
 	}

 	if ($method !== '_remap')
 	{
 		$params = array_slice($URI->rsegments, 2);
 	}

 /*
  * ------------------------------------------------------
  *  Is there a "pre_controller" hook?
  * ------------------------------------------------------
  */
 	$EXT->call_hook('pre_controller');

 /*
  * ------------------------------------------------------
  *  Instantiate the requested controller
  * ------------------------------------------------------
  */
 	// Mark a start point so we can benchmark the controller
 	$BM->mark('controller_execution_time_( '.$class.' / '.$method.' )_start');

 	$CI = new $class();

 /*
  * ------------------------------------------------------
  *  Is there a "post_controller_constructor" hook?
  * ------------------------------------------------------
  */
 	$EXT->call_hook('post_controller_constructor');

 /*
  * ------------------------------------------------------
  *  Call the requested method
  * ------------------------------------------------------
  */
 	call_user_func_array(array(&$CI, $method), $params);

 	// Mark a benchmark end point
 	$BM->mark('controller_execution_time_( '.$class.' / '.$method.' )_end');

 /*
  * ------------------------------------------------------
  *  Is there a "post_controller" hook?
  * ------------------------------------------------------
  */
 	$EXT->call_hook('post_controller');

 /*
  * ------------------------------------------------------
  *  Send the final rendered output to the browser
  * ------------------------------------------------------
  */
 	if ($EXT->call_hook('display_override') === FALSE)
 	{
 		$OUT->_display();
 	}

 /*
  * ------------------------------------------------------
  *  Is there a "post_system" hook?
  * ------------------------------------------------------
  */
 	$EXT->call_hook('post_system');
	<?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.
	*
	* @package CodeIgniter
	* @author EllisLab Dev Team
	* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
	* @copyright Copyright (c) 2014 - 2018, 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');

	/**
	* System Initialization File
	*
	* Loads the base classes and executes the request.
	*
	* @package CodeIgniter
	* @subpackage CodeIgniter
	* @category Front-controller
	* @author EllisLab Dev Team
	* @link https://codeigniter.com/user_guide/
	*/

	/**
	* CodeIgniter Version
	*
	* @var string
	*
	*/
	const CI_VERSION = '3.1.8';

	/*
	* ------------------------------------------------------
	* Load the framework constants
	* ------------------------------------------------------
	*/
	if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/constants.php'))
	{
	require_once(APPPATH.'config/'.ENVIRONMENT.'/constants.php');
	}

	if (file_exists(APPPATH.'config/constants.php'))
	{
	require_once(APPPATH.'config/constants.php');
	}

	/*
	* ------------------------------------------------------
	* Load the global functions
	* ------------------------------------------------------
	*/
	require_once(BASEPATH.'core/Common.php');


	/*
	* ------------------------------------------------------
	* Security procedures
	* ------------------------------------------------------
	*/

	if ( ! is_php('5.4'))
	{
	ini_set('magic_quotes_runtime', 0);

	if ((bool) ini_get('register_globals'))
	{
	$_protected = array(
	'_SERVER',
	'_GET',
	'_POST',
	'_FILES',
	'_REQUEST',
	'_SESSION',
	'_ENV',
	'_COOKIE',
	'GLOBALS',
	'HTTP_RAW_POST_DATA',
	'system_path',
	'application_folder',
	'view_folder',
	'_protected',
	'_registered'
	);

	$_registered = ini_get('variables_order');
	foreach (array('E' => '_ENV', 'G' => '_GET', 'P' => '_POST', 'C' => '_COOKIE', 'S' => '_SERVER') as $key => $superglobal)
	{
	if (strpos($_registered, $key) === FALSE)
	{
	continue;
	}

	foreach (array_keys($$superglobal) as $var)
	{
	if (isset($GLOBALS[$var]) && ! in_array($var, $_protected, TRUE))
	{
	$GLOBALS[$var] = NULL;
	}
	}
	}
	}
	}


	/*
	* ------------------------------------------------------
	* Define a custom error handler so we can log PHP errors
	* ------------------------------------------------------
	*/
	set_error_handler('_error_handler');
	set_exception_handler('_exception_handler');
	register_shutdown_function('_shutdown_handler');

	/*
	* ------------------------------------------------------
	* Set the subclass_prefix
	* ------------------------------------------------------
	*
	* Normally the "subclass_prefix" is set in the config file.
	* The subclass prefix allows CI to know if a core class is
	* being extended via a library in the local application
	* "libraries" folder. Since CI allows config items to be
	* overridden via data set in the main index.php file,
	* before proceeding we need to know if a subclass_prefix
	* override exists. If so, we will set this value now,
	* before any classes are loaded
	* Note: Since the config file data is cached it doesn't
	* hurt to load it here.
	*/
	if ( ! empty($assign_to_config['subclass_prefix']))
	{
	get_config(array('subclass_prefix' => $assign_to_config['subclass_prefix']));
	}

	/*
	* ------------------------------------------------------
	* Should we use a Composer autoloader?
	* ------------------------------------------------------
	*/
	if ($composer_autoload = config_item('composer_autoload'))
	{
	if ($composer_autoload === TRUE)
	{
	file_exists(APPPATH.'vendor/autoload.php')
	? require_once(APPPATH.'vendor/autoload.php')
	: log_message('error', '$config[\'composer_autoload\'] is set to TRUE but '.APPPATH.'vendor/autoload.php was not found.');
	}
	elseif (file_exists($composer_autoload))
	{
	require_once($composer_autoload);
	}
	else
	{
	log_message('error', 'Could not find the specified $config[\'composer_autoload\'] path: '.$composer_autoload);
	}
	}

	/*
	* ------------------------------------------------------
	* Start the timer... tick tock tick tock...
	* ------------------------------------------------------
	*/
	$BM =& load_class('Benchmark', 'core');
	$BM->mark('total_execution_time_start');
	$BM->mark('loading_time:_base_classes_start');

	/*
	* ------------------------------------------------------
	* Instantiate the hooks class
	* ------------------------------------------------------
	*/
	$EXT =& load_class('Hooks', 'core');

	/*
	* ------------------------------------------------------
	* Is there a "pre_system" hook?
	* ------------------------------------------------------
	*/
	$EXT->call_hook('pre_system');

	/*
	* ------------------------------------------------------
	* Instantiate the config class
	* ------------------------------------------------------
	*
	* Note: It is important that Config is loaded first as
	* most other classes depend on it either directly or by
	* depending on another class that uses it.
	*
	*/
	$CFG =& load_class('Config', 'core');

	// Do we have any manually set config items in the index.php file?
	if (isset($assign_to_config) && is_array($assign_to_config))
	{
	foreach ($assign_to_config as $key => $value)
	{
	$CFG->set_item($key, $value);
	}
	}

	/*
	* ------------------------------------------------------
	* Important charset-related stuff
	* ------------------------------------------------------
	*
	* Configure mbstring and/or iconv if they are enabled
	* and set MB_ENABLED and ICONV_ENABLED constants, so
	* that we don't repeatedly do extension_loaded() or
	* function_exists() calls.
	*
	* Note: UTF-8 class depends on this. It used to be done
	* in it's constructor, but it's _not_ class-specific.
	*
	*/
	$charset = strtoupper(config_item('charset'));
	ini_set('default_charset', $charset);

	if (extension_loaded('mbstring'))
	{
	define('MB_ENABLED', TRUE);
	// mbstring.internal_encoding is deprecated starting with PHP 5.6
	// and it's usage triggers E_DEPRECATED messages.
	@ini_set('mbstring.internal_encoding', $charset);
	// This is required for mb_convert_encoding() to strip invalid characters.
	// That's utilized by CI_Utf8, but it's also done for consistency with iconv.
	mb_substitute_character('none');
	}
	else
	{
	define('MB_ENABLED', FALSE);
	}

	// There's an ICONV_IMPL constant, but the PHP manual says that using
	// iconv's predefined constants is "strongly discouraged".
	if (extension_loaded('iconv'))
	{
	define('ICONV_ENABLED', TRUE);
	// iconv.internal_encoding is deprecated starting with PHP 5.6
	// and it's usage triggers E_DEPRECATED messages.
	@ini_set('iconv.internal_encoding', $charset);
	}
	else
	{
	define('ICONV_ENABLED', FALSE);
	}

	if (is_php('5.6'))
	{
	ini_set('php.internal_encoding', $charset);
	}

	/*
	* ------------------------------------------------------
	* Load compatibility features
	* ------------------------------------------------------
	*/

	require_once(BASEPATH.'core/compat/mbstring.php');
	require_once(BASEPATH.'core/compat/hash.php');
	require_once(BASEPATH.'core/compat/password.php');
	require_once(BASEPATH.'core/compat/standard.php');

	/*
	* ------------------------------------------------------
	* Instantiate the UTF-8 class
	* ------------------------------------------------------
	*/
	$UNI =& load_class('Utf8', 'core');

	/*
	* ------------------------------------------------------
	* Instantiate the URI class
	* ------------------------------------------------------
	*/
	$URI =& load_class('URI', 'core');

	/*
	* ------------------------------------------------------
	* Instantiate the routing class and set the routing
	* ------------------------------------------------------
	*/
	$RTR =& load_class('Router', 'core', isset($routing) ? $routing : NULL);

	/*
	* ------------------------------------------------------
	* Instantiate the output class
	* ------------------------------------------------------
	*/
	$OUT =& load_class('Output', 'core');

	/*
	* ------------------------------------------------------
	* Is there a valid cache file? If so, we're done...
	* ------------------------------------------------------
	*/
	if ($EXT->call_hook('cache_override') === FALSE && $OUT->_display_cache($CFG, $URI) === TRUE)
	{
	exit;
	}

	/*
	* -----------------------------------------------------
	* Load the security class for xss and csrf support
	* -----------------------------------------------------
	*/
	$SEC =& load_class('Security', 'core');

	/*
	* ------------------------------------------------------
	* Load the Input class and sanitize globals
	* ------------------------------------------------------
	*/
	$IN =& load_class('Input', 'core');

	/*
	* ------------------------------------------------------
	* Load the Language class
	* ------------------------------------------------------
	*/
	$LANG =& load_class('Lang', 'core');

	/*
	* ------------------------------------------------------
	* Load the app controller and local controller
	* ------------------------------------------------------
	*
	*/
	// Load the base controller class
	require_once BASEPATH.'core/Controller.php';

	/**
	* Reference to the CI_Controller method.
	*
	* Returns current CI instance object
	*
	* @return CI_Controller
	*/
	function &get_instance()
	{
	return CI_Controller::get_instance();
	}

	if (file_exists(APPPATH.'core/'.$CFG->config['subclass_prefix'].'Controller.php'))
	{
	require_once APPPATH.'core/'.$CFG->config['subclass_prefix'].'Controller.php';
	}

	// Set a mark point for benchmarking
	$BM->mark('loading_time:_base_classes_end');

	/*
	* ------------------------------------------------------
	* Sanity checks
	* ------------------------------------------------------
	*
	* The Router class has already validated the request,
	* leaving us with 3 options here:
	*
	* 1) an empty class name, if we reached the default
	* controller, but it didn't exist;
	* 2) a query string which doesn't go through a
	* file_exists() check
	* 3) a regular request for a non-existing page
	*
	* We handle all of these as a 404 error.
	*
	* Furthermore, none of the methods in the app controller
	* or the loader class can be called via the URI, nor can
	* controller methods that begin with an underscore.
	*/

	$e404 = FALSE;
	$class = ucfirst($RTR->class);
	$method = $RTR->method;

	if (empty($class) OR ! file_exists(APPPATH.'controllers/'.$RTR->directory.$class.'.php'))
	{
	$e404 = TRUE;
	}
	else
	{
	require_once(APPPATH.'controllers/'.$RTR->directory.$class.'.php');

	if ( ! class_exists($class, FALSE) OR $method[0] === '_' OR method_exists('CI_Controller', $method))
	{
	$e404 = TRUE;
	}
	elseif (method_exists($class, '_remap'))
	{
	$params = array($method, array_slice($URI->rsegments, 2));
	$method = '_remap';
	}
	elseif ( ! method_exists($class, $method))
	{
	$e404 = TRUE;
	}
	/**
	* DO NOT CHANGE THIS, NOTHING ELSE WORKS!
	*
	* - method_exists() returns true for non-public methods, which passes the previous elseif
	* - is_callable() returns false for PHP 4-style constructors, even if there's a __construct()
	* - method_exists($class, '__construct') won't work because CI_Controller::__construct() is inherited
	* - People will only complain if this doesn't work, even though it is documented that it shouldn't.
	*
	* ReflectionMethod::isConstructor() is the ONLY reliable check,
	* knowing which method will be executed as a constructor.
	*/
	elseif ( ! is_callable(array($class, $method)))
	{
	$reflection = new ReflectionMethod($class, $method);
	if ( ! $reflection->isPublic() OR $reflection->isConstructor())
	{
	$e404 = TRUE;
	}
	}
	}

	if ($e404)
	{
	if ( ! empty($RTR->routes['404_override']))
	{
	if (sscanf($RTR->routes['404_override'], '%[^/]/%s', $error_class, $error_method) !== 2)
	{
	$error_method = 'index';
	}

	$error_class = ucfirst($error_class);

	if ( ! class_exists($error_class, FALSE))
	{
	if (file_exists(APPPATH.'controllers/'.$RTR->directory.$error_class.'.php'))
	{
	require_once(APPPATH.'controllers/'.$RTR->directory.$error_class.'.php');
	$e404 = ! class_exists($error_class, FALSE);
	}
	// Were we in a directory? If so, check for a global override
	elseif ( ! empty($RTR->directory) && file_exists(APPPATH.'controllers/'.$error_class.'.php'))
	{
	require_once(APPPATH.'controllers/'.$error_class.'.php');
	if (($e404 = ! class_exists($error_class, FALSE)) === FALSE)
	{
	$RTR->directory = '';
	}
	}
	}
	else
	{
	$e404 = FALSE;
	}
	}

	// Did we reset the $e404 flag? If so, set the rsegments, starting from index 1
	if ( ! $e404)
	{
	$class = $error_class;
	$method = $error_method;

	$URI->rsegments = array(
	1 => $class,
	2 => $method
	);
	}
	else
	{
	show_404($RTR->directory.$class.'/'.$method);
	}
	}

	if ($method !== '_remap')
	{
	$params = array_slice($URI->rsegments, 2);
	}

	/*
	* ------------------------------------------------------
	* Is there a "pre_controller" hook?
	* ------------------------------------------------------
	*/
	$EXT->call_hook('pre_controller');

	/*
	* ------------------------------------------------------
	* Instantiate the requested controller
	* ------------------------------------------------------
	*/
	// Mark a start point so we can benchmark the controller
	$BM->mark('controller_execution_time_( '.$class.' / '.$method.' )_start');

	$CI = new $class();

	/*
	* ------------------------------------------------------
	* Is there a "post_controller_constructor" hook?
	* ------------------------------------------------------
	*/
	$EXT->call_hook('post_controller_constructor');

	/*
	* ------------------------------------------------------
	* Call the requested method
	* ------------------------------------------------------
	*/
	call_user_func_array(array(&$CI, $method), $params);

	// Mark a benchmark end point
	$BM->mark('controller_execution_time_( '.$class.' / '.$method.' )_end');

	/*
	* ------------------------------------------------------
	* Is there a "post_controller" hook?
	* ------------------------------------------------------
	*/
	$EXT->call_hook('post_controller');

	/*
	* ------------------------------------------------------
	* Send the final rendered output to the browser
	* ------------------------------------------------------
	*/
	if ($EXT->call_hook('display_override') === FALSE)
	{
	$OUT->_display();
	}

	/*
	* ------------------------------------------------------
	* Is there a "post_system" hook?
	* ------------------------------------------------------
	*/
	$EXT->call_hook('post_system');