/system/core/Common.php

.htaccess
AesEncryption.php
LICENSE
application
    .htaccess
    cache
        index.html
    config
        autoload.php
        config.php
        constants.php
        database.php
        doctypes.php
        foreign_chars.php
        hooks.php
        index.html
        memcached.php
        migration.php
        mimes.php
        profiler.php
        routes.php
        smileys.php
        user_agents.php
    controllers
        Systemid.php
        Welcome.php
        index.html
    core
        index.html
    helpers
        index.html
    hooks
        index.html
    index.html
    language
        english
            index.html
            system_lang.php
        index.html
    libraries
        index.html
    logs
        index.html
    models
        System_model.php
        index.html
    third_party
        index.html
    views
        about.php
        category
            addedit.php
            addeditsub.php
        components.php
        delete.php
        errors
            cli
                error_404.php
                error_db.php
                error_exception.php
                error_general.php
                error_php.php
                index.html
            html
                error_404.php
                error_db.php
                error_exception.php
                error_general.php
                error_php.php
                index.html
            index.html
        foot.php
        generator.php
        head.php
        index.html
        login.php
        main.php
        pass
            addedit.php
            show.php
        welcome_message.php
captcha
    sys.txt
favicon.ico
index.php
install.php
library
    AesEncryption.php
    bootstrap
        css
            .DS_Store
            bootstrap-grid.css
            bootstrap-grid.css.map
            bootstrap-grid.min.css
            bootstrap-grid.min.css.map
            bootstrap-reboot.css
            bootstrap-reboot.css.map
            bootstrap-reboot.min.css
            bootstrap-reboot.min.css.map
            bootstrap.css
            bootstrap.css.map
            bootstrap.min.css
            bootstrap.min.css.map
        js
            bootstrap.bundle.js
            bootstrap.bundle.js.map
            bootstrap.bundle.min.js
            bootstrap.bundle.min.js.map
            bootstrap.js
            bootstrap.js.map
            bootstrap.min.js
            bootstrap.min.js.map
    font-awesome
        HELP-US-OUT.txt
        css
            font-awesome.css
            font-awesome.min.css
        fonts
            FontAwesome.otf
            fontawesome-webfont.eot
            fontawesome-webfont.svg
            fontawesome-webfont.ttf
            fontawesome-webfont.woff
            fontawesome-webfont.woff2
        less
            animated.less
            bordered-pulled.less
            core.less
            fixed-width.less
            font-awesome.less
            icons.less
            larger.less
            list.less
            mixins.less
            path.less
            rotated-flipped.less
            screen-reader.less
            stacked.less
            variables.less
        scss
            _animated.scss
            _bordered-pulled.scss
            _core.scss
            _fixed-width.scss
            _icons.scss
            _larger.scss
            _list.scss
            _mixins.scss
            _path.scss
            _rotated-flipped.scss
            _screen-reader.scss
            _stacked.scss
            _variables.scss
            font-awesome.scss
    font-awesome.min.css
    jquery-ui
        AUTHORS.txt
        LICENSE.txt
        external
            jquery
                jquery.js
        images
            ui-icons_444444_256x240.png
            ui-icons_555555_256x240.png
            ui-icons_777620_256x240.png
            ui-icons_777777_256x240.png
            ui-icons_cc0000_256x240.png
            ui-icons_ffffff_256x240.png
        index.html
        jquery-ui.css
        jquery-ui.js
        jquery-ui.min.css
        jquery-ui.min.js
        jquery-ui.structure.css
        jquery-ui.structure.min.css
        jquery-ui.theme.css
        jquery-ui.theme.min.css
        package.json
    jquery.min.js
    jquerysctipttop.css
    logo.png
    password_indicator_bs4
        css
            signin.css
        index.html
        js
            jaktutorial.js
    popper.min.js
    right-click
        css
            contextMenu.min.css
        js
            contextMenu.min.js
    style.css
    tether
        css
            tether-theme-arrows-dark.css
            tether-theme-arrows-dark.min.css
            tether-theme-arrows.css
            tether-theme-arrows.min.css
            tether-theme-basic.css
            tether-theme-basic.min.css
            tether.css
            tether.min.css
        js
            tether.js
            tether.min.js
system
    .htaccess
    core
        Benchmark.php
        CodeIgniter.php
        Common.php
        Config.php
        Controller.php
        Exceptions.php
        Hooks.php
        Input.php
        Lang.php
        Loader.php
        Log.php
        Model.php
        Output.php
        Router.php
        Security.php
        URI.php
        Utf8.php
        compat
            hash.php
            index.html
            mbstring.php
            password.php
            standard.php
        index.html
    database
        DB.php
        DB_cache.php
        DB_driver.php
        DB_forge.php
        DB_query_builder.php
        DB_result.php
        DB_utility.php
        drivers
            cubrid
                cubrid_driver.php
                cubrid_forge.php
                cubrid_result.php
                cubrid_utility.php
                index.html
            ibase
                ibase_driver.php
                ibase_forge.php
                ibase_result.php
                ibase_utility.php
                index.html
            index.html
            mssql
                index.html
                mssql_driver.php
                mssql_forge.php
                mssql_result.php
                mssql_utility.php
            mysql
                index.html
                mysql_driver.php
                mysql_forge.php
                mysql_result.php
                mysql_utility.php
            mysqli
                index.html
                mysqli_driver.php
                mysqli_forge.php
                mysqli_result.php
                mysqli_utility.php
            oci8
                index.html
                oci8_driver.php
                oci8_forge.php
                oci8_result.php
                oci8_utility.php
            odbc
                index.html
                odbc_driver.php
                odbc_forge.php
                odbc_result.php
                odbc_utility.php
            pdo
                index.html
                pdo_driver.php
                pdo_forge.php
                pdo_result.php
                pdo_utility.php
                subdrivers
                    index.html
                    pdo_4d_driver.php
                    pdo_4d_forge.php
                    pdo_cubrid_driver.php
                    pdo_cubrid_forge.php
                    pdo_dblib_driver.php
                    pdo_dblib_forge.php
                    pdo_firebird_driver.php
                    pdo_firebird_forge.php
                    pdo_ibm_driver.php
                    pdo_ibm_forge.php
                    pdo_informix_driver.php
                    pdo_informix_forge.php
                    pdo_mysql_driver.php
                    pdo_mysql_forge.php
                    pdo_oci_driver.php
                    pdo_oci_forge.php
                    pdo_odbc_driver.php
                    pdo_odbc_forge.php
                    pdo_pgsql_driver.php
                    pdo_pgsql_forge.php
                    pdo_sqlite_driver.php
                    pdo_sqlite_forge.php
                    pdo_sqlsrv_driver.php
                    pdo_sqlsrv_forge.php
            postgre
                index.html
                postgre_driver.php
                postgre_forge.php
                postgre_result.php
                postgre_utility.php
            sqlite
                index.html
                sqlite_driver.php
                sqlite_forge.php
                sqlite_result.php
                sqlite_utility.php
            sqlite3
                index.html
                sqlite3_driver.php
                sqlite3_forge.php
                sqlite3_result.php
                sqlite3_utility.php
            sqlsrv
                index.html
                sqlsrv_driver.php
                sqlsrv_forge.php
                sqlsrv_result.php
                sqlsrv_utility.php
        index.html
    fonts
        index.html
        texb.ttf
    helpers
        array_helper.php
        captcha_helper.php
        cookie_helper.php
        date_helper.php
        directory_helper.php
        download_helper.php
        email_helper.php
        file_helper.php
        form_helper.php
        html_helper.php
        index.html
        inflector_helper.php
        language_helper.php
        number_helper.php
        path_helper.php
        security_helper.php
        smiley_helper.php
        string_helper.php
        text_helper.php
        typography_helper.php
        url_helper.php
        xml_helper.php
    index.html
    language
        english
            calendar_lang.php
            date_lang.php
            db_lang.php
            email_lang.php
            form_validation_lang.php
            ftp_lang.php
            imglib_lang.php
            index.html
            migration_lang.php
            number_lang.php
            pagination_lang.php
            profiler_lang.php
            unit_test_lang.php
            upload_lang.php
        index.html
    libraries
        Cache
            Cache.php
            drivers
                Cache_apc.php
                Cache_dummy.php
                Cache_file.php
                Cache_memcached.php
                Cache_redis.php
                Cache_wincache.php
                index.html
            index.html
        Calendar.php
        Cart.php
        Driver.php
        Email.php
        Encrypt.php
        Encryption.php
        Form_validation.php
        Ftp.php
        Image_lib.php
        Javascript
            Jquery.php
            index.html
        Javascript.php
        Migration.php
        Pagination.php
        Parser.php
        Profiler.php
        Session
            Session.php
            SessionHandlerInterface.php
            Session_driver.php
            drivers
                Session_database_driver.php
                Session_files_driver.php
                Session_memcached_driver.php
                Session_redis_driver.php
                index.html
            index.html
        Table.php
        Trackback.php
        Typography.php
        Unit_test.php
        Upload.php
        User_agent.php
        Xmlrpc.php
        Xmlrpcs.php
        Zip.php
        index.html
<?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');

/**
 * Common Functions
 *
 * Loads the base classes and executes the request.
 *
 * @package		CodeIgniter
 * @subpackage	CodeIgniter
 * @category	Common Functions
 * @author		EllisLab Dev Team
 * @link		https://codeigniter.com/user_guide/
 */

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

if ( ! function_exists('is_php'))
{
	/**
	 * Determines if the current version of PHP is equal to or greater than the supplied value
	 *
	 * @param	string
	 * @return	bool	TRUE if the current version is $version or higher
	 */
	function is_php($version)
	{
		static $_is_php;
		$version = (string) $version;

		if ( ! isset($_is_php[$version]))
		{
			$_is_php[$version] = version_compare(PHP_VERSION, $version, '>=');
		}

		return $_is_php[$version];
	}
}

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

if ( ! function_exists('is_really_writable'))
{
	/**
	 * Tests for file writability
	 *
	 * is_writable() returns TRUE on Windows servers when you really can't write to
	 * the file, based on the read-only attribute. is_writable() is also unreliable
	 * on Unix servers if safe_mode is on.
	 *
	 * @link	https://bugs.php.net/bug.php?id=54709
	 * @param	string
	 * @return	bool
	 */
	function is_really_writable($file)
	{
		// If we're on a Unix server with safe_mode off we call is_writable
		if (DIRECTORY_SEPARATOR === '/' && (is_php('5.4') OR ! ini_get('safe_mode')))
		{
			return is_writable($file);
		}

		/* For Windows servers and safe_mode "on" installations we'll actually
		 * write a file then read it. Bah...
		 */
		if (is_dir($file))
		{
			$file = rtrim($file, '/').'/'.md5(mt_rand());
			if (($fp = @fopen($file, 'ab')) === FALSE)
			{
				return FALSE;
			}

			fclose($fp);
			@chmod($file, 0777);
			@unlink($file);
			return TRUE;
		}
		elseif ( ! is_file($file) OR ($fp = @fopen($file, 'ab')) === FALSE)
		{
			return FALSE;
		}

		fclose($fp);
		return TRUE;
	}
}

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

if ( ! function_exists('load_class'))
{
	/**
	 * Class registry
	 *
	 * This function acts as a singleton. If the requested class does not
	 * exist it is instantiated and set to a static variable. If it has
	 * previously been instantiated the variable is returned.
	 *
	 * @param	string	the class name being requested
	 * @param	string	the directory where the class should be found
	 * @param	mixed	an optional argument to pass to the class constructor
	 * @return	object
	 */
	function &load_class($class, $directory = 'libraries', $param = NULL)
	{
		static $_classes = array();

		// Does the class exist? If so, we're done...
		if (isset($_classes[$class]))
		{
			return $_classes[$class];
		}

		$name = FALSE;

		// Look for the class first in the local application/libraries folder
		// then in the native system/libraries folder
		foreach (array(APPPATH, BASEPATH) as $path)
		{
			if (file_exists($path.$directory.'/'.$class.'.php'))
			{
				$name = 'CI_'.$class;

				if (class_exists($name, FALSE) === FALSE)
				{
					require_once($path.$directory.'/'.$class.'.php');
				}

				break;
			}
		}

		// Is the request a class extension? If so we load it too
		if (file_exists(APPPATH.$directory.'/'.config_item('subclass_prefix').$class.'.php'))
		{
			$name = config_item('subclass_prefix').$class;

			if (class_exists($name, FALSE) === FALSE)
			{
				require_once(APPPATH.$directory.'/'.$name.'.php');
			}
		}

		// Did we find the class?
		if ($name === FALSE)
		{
			// Note: We use exit() rather than show_error() in order to avoid a
			// self-referencing loop with the Exceptions class
			set_status_header(503);
			echo 'Unable to locate the specified class: '.$class.'.php';
			exit(5); // EXIT_UNK_CLASS
		}

		// Keep track of what we just loaded
		is_loaded($class);

		$_classes[$class] = isset($param)
			? new $name($param)
			: new $name();
		return $_classes[$class];
	}
}

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

if ( ! function_exists('is_loaded'))
{
	/**
	 * Keeps track of which libraries have been loaded. This function is
	 * called by the load_class() function above
	 *
	 * @param	string
	 * @return	array
	 */
	function &is_loaded($class = '')
	{
		static $_is_loaded = array();

		if ($class !== '')
		{
			$_is_loaded[strtolower($class)] = $class;
		}

		return $_is_loaded;
	}
}

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

if ( ! function_exists('get_config'))
{
	/**
	 * Loads the main config.php file
	 *
	 * This function lets us grab the config file even if the Config class
	 * hasn't been instantiated yet
	 *
	 * @param	array
	 * @return	array
	 */
	function &get_config(Array $replace = array())
	{
		static $config;

		if (empty($config))
		{
			$file_path = APPPATH.'config/config.php';
			$found = FALSE;
			if (file_exists($file_path))
			{
				$found = TRUE;
				require($file_path);
			}

			// Is the config file in the environment folder?
			if (file_exists($file_path = APPPATH.'config/'.ENVIRONMENT.'/config.php'))
			{
				require($file_path);
			}
			elseif ( ! $found)
			{
				set_status_header(503);
				echo 'The configuration file does not exist.';
				exit(3); // EXIT_CONFIG
			}

			// Does the $config array exist in the file?
			if ( ! isset($config) OR ! is_array($config))
			{
				set_status_header(503);
				echo 'Your config file does not appear to be formatted correctly.';
				exit(3); // EXIT_CONFIG
			}
		}

		// Are any values being dynamically added or replaced?
		foreach ($replace as $key => $val)
		{
			$config[$key] = $val;
		}

		return $config;
	}
}

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

if ( ! function_exists('config_item'))
{
	/**
	 * Returns the specified config item
	 *
	 * @param	string
	 * @return	mixed
	 */
	function config_item($item)
	{
		static $_config;

		if (empty($_config))
		{
			// references cannot be directly assigned to static variables, so we use an array
			$_config[0] =& get_config();
		}

		return isset($_config[0][$item]) ? $_config[0][$item] : NULL;
	}
}

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

if ( ! function_exists('get_mimes'))
{
	/**
	 * Returns the MIME types array from config/mimes.php
	 *
	 * @return	array
	 */
	function &get_mimes()
	{
		static $_mimes;

		if (empty($_mimes))
		{
			$_mimes = file_exists(APPPATH.'config/mimes.php')
				? include(APPPATH.'config/mimes.php')
				: array();

			if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'))
			{
				$_mimes = array_merge($_mimes, include(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'));
			}
		}

		return $_mimes;
	}
}

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

if ( ! function_exists('is_https'))
{
	/**
	 * Is HTTPS?
	 *
	 * Determines if the application is accessed via an encrypted
	 * (HTTPS) connection.
	 *
	 * @return	bool
	 */
	function is_https()
	{
		if ( ! empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off')
		{
			return TRUE;
		}
		elseif (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) === 'https')
		{
			return TRUE;
		}
		elseif ( ! empty($_SERVER['HTTP_FRONT_END_HTTPS']) && strtolower($_SERVER['HTTP_FRONT_END_HTTPS']) !== 'off')
		{
			return TRUE;
		}

		return FALSE;
	}
}

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

if ( ! function_exists('is_cli'))
{

	/**
	 * Is CLI?
	 *
	 * Test to see if a request was made from the command line.
	 *
	 * @return 	bool
	 */
	function is_cli()
	{
		return (PHP_SAPI === 'cli' OR defined('STDIN'));
	}
}

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

if ( ! function_exists('show_error'))
{
	/**
	 * Error Handler
	 *
	 * This function lets us invoke the exception class and
	 * display errors using the standard error template located
	 * in application/views/errors/error_general.php
	 * This function will send the error page directly to the
	 * browser and exit.
	 *
	 * @param	string
	 * @param	int
	 * @param	string
	 * @return	void
	 */
	function show_error($message, $status_code = 500, $heading = 'An Error Was Encountered')
	{
		$status_code = abs($status_code);
		if ($status_code < 100)
		{
			$exit_status = $status_code + 9; // 9 is EXIT__AUTO_MIN
			$status_code = 500;
		}
		else
		{
			$exit_status = 1; // EXIT_ERROR
		}

		$_error =& load_class('Exceptions', 'core');
		echo $_error->show_error($heading, $message, 'error_general', $status_code);
		exit($exit_status);
	}
}

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

if ( ! function_exists('show_404'))
{
	/**
	 * 404 Page Handler
	 *
	 * This function is similar to the show_error() function above
	 * However, instead of the standard error template it displays
	 * 404 errors.
	 *
	 * @param	string
	 * @param	bool
	 * @return	void
	 */
	function show_404($page = '', $log_error = TRUE)
	{
		$_error =& load_class('Exceptions', 'core');
		$_error->show_404($page, $log_error);
		exit(4); // EXIT_UNKNOWN_FILE
	}
}

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

if ( ! function_exists('log_message'))
{
	/**
	 * Error Logging Interface
	 *
	 * We use this as a simple mechanism to access the logging
	 * class and send messages to be logged.
	 *
	 * @param	string	the error level: 'error', 'debug' or 'info'
	 * @param	string	the error message
	 * @return	void
	 */
	function log_message($level, $message)
	{
		static $_log;

		if ($_log === NULL)
		{
			// references cannot be directly assigned to static variables, so we use an array
			$_log[0] =& load_class('Log', 'core');
		}

		$_log[0]->write_log($level, $message);
	}
}

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

if ( ! function_exists('set_status_header'))
{
	/**
	 * Set HTTP Status Header
	 *
	 * @param	int	the status code
	 * @param	string
	 * @return	void
	 */
	function set_status_header($code = 200, $text = '')
	{
		if (is_cli())
		{
			return;
		}

		if (empty($code) OR ! is_numeric($code))
		{
			show_error('Status codes must be numeric', 500);
		}

		if (empty($text))
		{
			is_int($code) OR $code = (int) $code;
			$stati = array(
				100	=> 'Continue',
				101	=> 'Switching Protocols',

				200	=> 'OK',
				201	=> 'Created',
				202	=> 'Accepted',
				203	=> 'Non-Authoritative Information',
				204	=> 'No Content',
				205	=> 'Reset Content',
				206	=> 'Partial Content',

				300	=> 'Multiple Choices',
				301	=> 'Moved Permanently',
				302	=> 'Found',
				303	=> 'See Other',
				304	=> 'Not Modified',
				305	=> 'Use Proxy',
				307	=> 'Temporary Redirect',

				400	=> 'Bad Request',
				401	=> 'Unauthorized',
				402	=> 'Payment Required',
				403	=> 'Forbidden',
				404	=> 'Not Found',
				405	=> 'Method Not Allowed',
				406	=> 'Not Acceptable',
				407	=> 'Proxy Authentication Required',
				408	=> 'Request Timeout',
				409	=> 'Conflict',
				410	=> 'Gone',
				411	=> 'Length Required',
				412	=> 'Precondition Failed',
				413	=> 'Request Entity Too Large',
				414	=> 'Request-URI Too Long',
				415	=> 'Unsupported Media Type',
				416	=> 'Requested Range Not Satisfiable',
				417	=> 'Expectation Failed',
				422	=> 'Unprocessable Entity',
				426	=> 'Upgrade Required',
				428	=> 'Precondition Required',
				429	=> 'Too Many Requests',
				431	=> 'Request Header Fields Too Large',

				500	=> 'Internal Server Error',
				501	=> 'Not Implemented',
				502	=> 'Bad Gateway',
				503	=> 'Service Unavailable',
				504	=> 'Gateway Timeout',
				505	=> 'HTTP Version Not Supported',
				511	=> 'Network Authentication Required',
			);

			if (isset($stati[$code]))
			{
				$text = $stati[$code];
			}
			else
			{
				show_error('No status text available. Please check your status code number or supply your own message text.', 500);
			}
		}

		if (strpos(PHP_SAPI, 'cgi') === 0)
		{
			header('Status: '.$code.' '.$text, TRUE);
			return;
		}

		$server_protocol = (isset($_SERVER['SERVER_PROTOCOL']) && in_array($_SERVER['SERVER_PROTOCOL'], array('HTTP/1.0', 'HTTP/1.1', 'HTTP/2'), TRUE))
			? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.1';
		header($server_protocol.' '.$code.' '.$text, TRUE, $code);
	}
}

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

if ( ! function_exists('_error_handler'))
{
	/**
	 * Error Handler
	 *
	 * This is the custom error handler that is declared at the (relative)
	 * top of CodeIgniter.php. The main reason we use this is to permit
	 * PHP errors to be logged in our own log files since the user may
	 * not have access to server logs. Since this function effectively
	 * intercepts PHP errors, however, we also need to display errors
	 * based on the current error_reporting level.
	 * We do that with the use of a PHP error template.
	 *
	 * @param	int	$severity
	 * @param	string	$message
	 * @param	string	$filepath
	 * @param	int	$line
	 * @return	void
	 */
	function _error_handler($severity, $message, $filepath, $line)
	{
		$is_error = (((E_ERROR | E_PARSE | E_COMPILE_ERROR | E_CORE_ERROR | E_USER_ERROR) & $severity) === $severity);

		// When an error occurred, set the status header to '500 Internal Server Error'
		// to indicate to the client something went wrong.
		// This can't be done within the $_error->show_php_error method because
		// it is only called when the display_errors flag is set (which isn't usually
		// the case in a production environment) or when errors are ignored because
		// they are above the error_reporting threshold.
		if ($is_error)
		{
			set_status_header(500);
		}

		// Should we ignore the error? We'll get the current error_reporting
		// level and add its bits with the severity bits to find out.
		if (($severity & error_reporting()) !== $severity)
		{
			return;
		}

		$_error =& load_class('Exceptions', 'core');
		$_error->log_exception($severity, $message, $filepath, $line);

		// Should we display the error?
		if (str_ireplace(array('off', 'none', 'no', 'false', 'null'), '', ini_get('display_errors')))
		{
			$_error->show_php_error($severity, $message, $filepath, $line);
		}

		// If the error is fatal, the execution of the script should be stopped because
		// errors can't be recovered from. Halting the script conforms with PHP's
		// default error handling. See http://www.php.net/manual/en/errorfunc.constants.php
		if ($is_error)
		{
			exit(1); // EXIT_ERROR
		}
	}
}

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

if ( ! function_exists('_exception_handler'))
{
	/**
	 * Exception Handler
	 *
	 * Sends uncaught exceptions to the logger and displays them
	 * only if display_errors is On so that they don't show up in
	 * production environments.
	 *
	 * @param	Exception	$exception
	 * @return	void
	 */
	function _exception_handler($exception)
	{
		$_error =& load_class('Exceptions', 'core');
		$_error->log_exception('error', 'Exception: '.$exception->getMessage(), $exception->getFile(), $exception->getLine());

		is_cli() OR set_status_header(500);
		// Should we display the error?
		if (str_ireplace(array('off', 'none', 'no', 'false', 'null'), '', ini_get('display_errors')))
		{
			$_error->show_exception($exception);
		}

		exit(1); // EXIT_ERROR
	}
}

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

if ( ! function_exists('_shutdown_handler'))
{
	/**
	 * Shutdown Handler
	 *
	 * This is the shutdown handler that is declared at the top
	 * of CodeIgniter.php. The main reason we use this is to simulate
	 * a complete custom exception handler.
	 *
	 * E_STRICT is purposively neglected because such events may have
	 * been caught. Duplication or none? None is preferred for now.
	 *
	 * @link	http://insomanic.me.uk/post/229851073/php-trick-catching-fatal-errors-e-error-with-a
	 * @return	void
	 */
	function _shutdown_handler()
	{
		$last_error = error_get_last();
		if (isset($last_error) &&
			($last_error['type'] & (E_ERROR | E_PARSE | E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_COMPILE_WARNING)))
		{
			_error_handler($last_error['type'], $last_error['message'], $last_error['file'], $last_error['line']);
		}
	}
}

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

if ( ! function_exists('remove_invisible_characters'))
{
	/**
	 * Remove Invisible Characters
	 *
	 * This prevents sandwiching null characters
	 * between ascii characters, like Java\0script.
	 *
	 * @param	string
	 * @param	bool
	 * @return	string
	 */
	function remove_invisible_characters($str, $url_encoded = TRUE)
	{
		$non_displayables = array();

		// every control character except newline (dec 10),
		// carriage return (dec 13) and horizontal tab (dec 09)
		if ($url_encoded)
		{
			$non_displayables[] = '/%0[0-8bcef]/i';	// url encoded 00-08, 11, 12, 14, 15
			$non_displayables[] = '/%1[0-9a-f]/i';	// url encoded 16-31
			$non_displayables[] = '/%7f/i';	// url encoded 127
		}

		$non_displayables[] = '/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]+/S';	// 00-08, 11, 12, 14-31, 127

		do
		{
			$str = preg_replace($non_displayables, '', $str, -1, $count);
		}
		while ($count);

		return $str;
	}
}

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

if ( ! function_exists('html_escape'))
{
	/**
	 * Returns HTML escaped variable.
	 *
	 * @param	mixed	$var		The input string or array of strings to be escaped.
	 * @param	bool	$double_encode	$double_encode set to FALSE prevents escaping twice.
	 * @return	mixed			The escaped string or array of strings as a result.
	 */
	function html_escape($var, $double_encode = TRUE)
	{
		if (empty($var))
		{
			return $var;
		}

		if (is_array($var))
		{
			foreach (array_keys($var) as $key)
			{
				$var[$key] = html_escape($var[$key], $double_encode);
			}

			return $var;
		}

		return htmlspecialchars($var, ENT_QUOTES, config_item('charset'), $double_encode);
	}
}

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

if ( ! function_exists('_stringify_attributes'))
{
	/**
	 * Stringify attributes for use in HTML tags.
	 *
	 * Helper function used to convert a string, array, or object
	 * of attributes to a string.
	 *
	 * @param	mixed	string, array, object
	 * @param	bool
	 * @return	string
	 */
	function _stringify_attributes($attributes, $js = FALSE)
	{
		$atts = NULL;

		if (empty($attributes))
		{
			return $atts;
		}

		if (is_string($attributes))
		{
			return ' '.$attributes;
		}

		$attributes = (array) $attributes;

		foreach ($attributes as $key => $val)
		{
			$atts .= ($js) ? $key.'='.$val.',' : ' '.$key.'="'.$val.'"';
		}

		return rtrim($atts, ',');
	}
}

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

if ( ! function_exists('function_usable'))
{
	/**
	 * Function usable
	 *
	 * Executes a function_exists() check, and if the Suhosin PHP
	 * extension is loaded - checks whether the function that is
	 * checked might be disabled in there as well.
	 *
	 * This is useful as function_exists() will return FALSE for
	 * functions disabled via the *disable_functions* php.ini
	 * setting, but not for *suhosin.executor.func.blacklist* and
	 * *suhosin.executor.disable_eval*. These settings will just
	 * terminate script execution if a disabled function is executed.
	 *
	 * The above described behavior turned out to be a bug in Suhosin,
	 * but even though a fix was committed for 0.9.34 on 2012-02-12,
	 * that version is yet to be released. This function will therefore
	 * be just temporary, but would probably be kept for a few years.
	 *
	 * @link	http://www.hardened-php.net/suhosin/
	 * @param	string	$function_name	Function to check for
	 * @return	bool	TRUE if the function exists and is safe to call,
	 *			FALSE otherwise.
	 */
	function function_usable($function_name)
	{
		static $_suhosin_func_blacklist;

		if (function_exists($function_name))
		{
			if ( ! isset($_suhosin_func_blacklist))
			{
				$_suhosin_func_blacklist = extension_loaded('suhosin')
					? explode(',', trim(ini_get('suhosin.executor.func.blacklist')))
					: array();
			}

			return ! in_array($function_name, $_suhosin_func_blacklist, TRUE);
		}

		return FALSE;
	}
}




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