system/libraries/User_agent.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 - 2016, 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 - 2016, 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');

 /**
  * User Agent Class
  *
  * Identifies the platform, browser, robot, or mobile device of the browsing agent
  *
  * @package		CodeIgniter
  * @subpackage	Libraries
  * @category	User Agent
  * @author		EllisLab Dev Team
  * @link		https://codeigniter.com/user_guide/libraries/user_agent.html
  */
 class CI_User_agent {

 	/**
 	 * Current user-agent
 	 *
 	 * @var string
 	 */
 	public $agent = NULL;

 	/**
 	 * Flag for if the user-agent belongs to a browser
 	 *
 	 * @var bool
 	 */
 	public $is_browser = FALSE;

 	/**
 	 * Flag for if the user-agent is a robot
 	 *
 	 * @var bool
 	 */
 	public $is_robot = FALSE;

 	/**
 	 * Flag for if the user-agent is a mobile browser
 	 *
 	 * @var bool
 	 */
 	public $is_mobile = FALSE;

 	/**
 	 * Languages accepted by the current user agent
 	 *
 	 * @var array
 	 */
 	public $languages = array();

 	/**
 	 * Character sets accepted by the current user agent
 	 *
 	 * @var array
 	 */
 	public $charsets = array();

 	/**
 	 * List of platforms to compare against current user agent
 	 *
 	 * @var array
 	 */
 	public $platforms = array();

 	/**
 	 * List of browsers to compare against current user agent
 	 *
 	 * @var array
 	 */
 	public $browsers = array();

 	/**
 	 * List of mobile browsers to compare against current user agent
 	 *
 	 * @var array
 	 */
 	public $mobiles = array();

 	/**
 	 * List of robots to compare against current user agent
 	 *
 	 * @var array
 	 */
 	public $robots = array();

 	/**
 	 * Current user-agent platform
 	 *
 	 * @var string
 	 */
 	public $platform = '';

 	/**
 	 * Current user-agent browser
 	 *
 	 * @var string
 	 */
 	public $browser = '';

 	/**
 	 * Current user-agent version
 	 *
 	 * @var string
 	 */
 	public $version = '';

 	/**
 	 * Current user-agent mobile name
 	 *
 	 * @var string
 	 */
 	public $mobile = '';

 	/**
 	 * Current user-agent robot name
 	 *
 	 * @var string
 	 */
 	public $robot = '';

 	/**
 	 * HTTP Referer
 	 *
 	 * @var	mixed
 	 */
 	public $referer;

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

 	/**
 	 * Constructor
 	 *
 	 * Sets the User Agent and runs the compilation routine
 	 *
 	 * @return	void
 	 */
 	public function __construct()
 	{
 		if (isset($_SERVER['HTTP_USER_AGENT']))
 		{
 			$this->agent = trim($_SERVER['HTTP_USER_AGENT']);
 		}

 		if ($this->agent !== NULL && $this->_load_agent_file())
 		{
 			$this->_compile_data();
 		}

 		log_message('info', 'User Agent Class Initialized');
 	}

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

 	/**
 	 * Compile the User Agent Data
 	 *
 	 * @return	bool
 	 */
 	protected function _load_agent_file()
 	{
 		if (($found = file_exists(APPPATH.'config/user_agents.php')))
 		{
 			include(APPPATH.'config/user_agents.php');
 		}

 		if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/user_agents.php'))
 		{
 			include(APPPATH.'config/'.ENVIRONMENT.'/user_agents.php');
 			$found = TRUE;
 		}

 		if ($found !== TRUE)
 		{
 			return FALSE;
 		}

 		$return = FALSE;

 		if (isset($platforms))
 		{
 			$this->platforms = $platforms;
 			unset($platforms);
 			$return = TRUE;
 		}

 		if (isset($browsers))
 		{
 			$this->browsers = $browsers;
 			unset($browsers);
 			$return = TRUE;
 		}

 		if (isset($mobiles))
 		{
 			$this->mobiles = $mobiles;
 			unset($mobiles);
 			$return = TRUE;
 		}

 		if (isset($robots))
 		{
 			$this->robots = $robots;
 			unset($robots);
 			$return = TRUE;
 		}

 		return $return;
 	}

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

 	/**
 	 * Compile the User Agent Data
 	 *
 	 * @return	bool
 	 */
 	protected function _compile_data()
 	{
 		$this->_set_platform();

 		foreach (array('_set_robot', '_set_browser', '_set_mobile') as $function)
 		{
 			if ($this->$function() === TRUE)
 			{
 				break;
 			}
 		}
 	}

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

 	/**
 	 * Set the Platform
 	 *
 	 * @return	bool
 	 */
 	protected function _set_platform()
 	{
 		if (is_array($this->platforms) && count($this->platforms) > 0)
 		{
 			foreach ($this->platforms as $key => $val)
 			{
 				if (preg_match('|'.preg_quote($key).'|i', $this->agent))
 				{
 					$this->platform = $val;
 					return TRUE;
 				}
 			}
 		}

 		$this->platform = 'Unknown Platform';
 		return FALSE;
 	}

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

 	/**
 	 * Set the Browser
 	 *
 	 * @return	bool
 	 */
 	protected function _set_browser()
 	{
 		if (is_array($this->browsers) && count($this->browsers) > 0)
 		{
 			foreach ($this->browsers as $key => $val)
 			{
 				if (preg_match('|'.$key.'.*?([0-9\.]+)|i', $this->agent, $match))
 				{
 					$this->is_browser = TRUE;
 					$this->version = $match[1];
 					$this->browser = $val;
 					$this->_set_mobile();
 					return TRUE;
 				}
 			}
 		}

 		return FALSE;
 	}

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

 	/**
 	 * Set the Robot
 	 *
 	 * @return	bool
 	 */
 	protected function _set_robot()
 	{
 		if (is_array($this->robots) && count($this->robots) > 0)
 		{
 			foreach ($this->robots as $key => $val)
 			{
 				if (preg_match('|'.preg_quote($key).'|i', $this->agent))
 				{
 					$this->is_robot = TRUE;
 					$this->robot = $val;
 					$this->_set_mobile();
 					return TRUE;
 				}
 			}
 		}

 		return FALSE;
 	}

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

 	/**
 	 * Set the Mobile Device
 	 *
 	 * @return	bool
 	 */
 	protected function _set_mobile()
 	{
 		if (is_array($this->mobiles) && count($this->mobiles) > 0)
 		{
 			foreach ($this->mobiles as $key => $val)
 			{
 				if (FALSE !== (stripos($this->agent, $key)))
 				{
 					$this->is_mobile = TRUE;
 					$this->mobile = $val;
 					return TRUE;
 				}
 			}
 		}

 		return FALSE;
 	}

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

 	/**
 	 * Set the accepted languages
 	 *
 	 * @return	void
 	 */
 	protected function _set_languages()
 	{
 		if ((count($this->languages) === 0) && ! empty($_SERVER['HTTP_ACCEPT_LANGUAGE']))
 		{
 			$this->languages = explode(',', preg_replace('/(;\s?q=[0-9\.]+)|\s/i', '', strtolower(trim($_SERVER['HTTP_ACCEPT_LANGUAGE']))));
 		}

 		if (count($this->languages) === 0)
 		{
 			$this->languages = array('Undefined');
 		}
 	}

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

 	/**
 	 * Set the accepted character sets
 	 *
 	 * @return	void
 	 */
 	protected function _set_charsets()
 	{
 		if ((count($this->charsets) === 0) && ! empty($_SERVER['HTTP_ACCEPT_CHARSET']))
 		{
 			$this->charsets = explode(',', preg_replace('/(;\s?q=.+)|\s/i', '', strtolower(trim($_SERVER['HTTP_ACCEPT_CHARSET']))));
 		}

 		if (count($this->charsets) === 0)
 		{
 			$this->charsets = array('Undefined');
 		}
 	}

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

 	/**
 	 * Is Browser
 	 *
 	 * @param	string	$key
 	 * @return	bool
 	 */
 	public function is_browser($key = NULL)
 	{
 		if ( ! $this->is_browser)
 		{
 			return FALSE;
 		}

 		// No need to be specific, it's a browser
 		if ($key === NULL)
 		{
 			return TRUE;
 		}

 		// Check for a specific browser
 		return (isset($this->browsers[$key]) && $this->browser === $this->browsers[$key]);
 	}

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

 	/**
 	 * Is Robot
 	 *
 	 * @param	string	$key
 	 * @return	bool
 	 */
 	public function is_robot($key = NULL)
 	{
 		if ( ! $this->is_robot)
 		{
 			return FALSE;
 		}

 		// No need to be specific, it's a robot
 		if ($key === NULL)
 		{
 			return TRUE;
 		}

 		// Check for a specific robot
 		return (isset($this->robots[$key]) && $this->robot === $this->robots[$key]);
 	}

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

 	/**
 	 * Is Mobile
 	 *
 	 * @param	string	$key
 	 * @return	bool
 	 */
 	public function is_mobile($key = NULL)
 	{
 		if ( ! $this->is_mobile)
 		{
 			return FALSE;
 		}

 		// No need to be specific, it's a mobile
 		if ($key === NULL)
 		{
 			return TRUE;
 		}

 		// Check for a specific robot
 		return (isset($this->mobiles[$key]) && $this->mobile === $this->mobiles[$key]);
 	}

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

 	/**
 	 * Is this a referral from another site?
 	 *
 	 * @return	bool
 	 */
 	public function is_referral()
 	{
 		if ( ! isset($this->referer))
 		{
 			if (empty($_SERVER['HTTP_REFERER']))
 			{
 				$this->referer = FALSE;
 			}
 			else
 			{
 				$referer_host = @parse_url($_SERVER['HTTP_REFERER'], PHP_URL_HOST);
 				$own_host = parse_url(config_item('base_url'), PHP_URL_HOST);

 				$this->referer = ($referer_host && $referer_host !== $own_host);
 			}
 		}

 		return $this->referer;
 	}

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

 	/**
 	 * Agent String
 	 *
 	 * @return	string
 	 */
 	public function agent_string()
 	{
 		return $this->agent;
 	}

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

 	/**
 	 * Get Platform
 	 *
 	 * @return	string
 	 */
 	public function platform()
 	{
 		return $this->platform;
 	}

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

 	/**
 	 * Get Browser Name
 	 *
 	 * @return	string
 	 */
 	public function browser()
 	{
 		return $this->browser;
 	}

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

 	/**
 	 * Get the Browser Version
 	 *
 	 * @return	string
 	 */
 	public function version()
 	{
 		return $this->version;
 	}

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

 	/**
 	 * Get The Robot Name
 	 *
 	 * @return	string
 	 */
 	public function robot()
 	{
 		return $this->robot;
 	}
 	// --------------------------------------------------------------------

 	/**
 	 * Get the Mobile Device
 	 *
 	 * @return	string
 	 */
 	public function mobile()
 	{
 		return $this->mobile;
 	}

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

 	/**
 	 * Get the referrer
 	 *
 	 * @return	bool
 	 */
 	public function referrer()
 	{
 		return empty($_SERVER['HTTP_REFERER']) ? '' : trim($_SERVER['HTTP_REFERER']);
 	}

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

 	/**
 	 * Get the accepted languages
 	 *
 	 * @return	array
 	 */
 	public function languages()
 	{
 		if (count($this->languages) === 0)
 		{
 			$this->_set_languages();
 		}

 		return $this->languages;
 	}

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

 	/**
 	 * Get the accepted Character Sets
 	 *
 	 * @return	array
 	 */
 	public function charsets()
 	{
 		if (count($this->charsets) === 0)
 		{
 			$this->_set_charsets();
 		}

 		return $this->charsets;
 	}

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

 	/**
 	 * Test for a particular language
 	 *
 	 * @param	string	$lang
 	 * @return	bool
 	 */
 	public function accept_lang($lang = 'en')
 	{
 		return in_array(strtolower($lang), $this->languages(), TRUE);
 	}

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

 	/**
 	 * Test for a particular character set
 	 *
 	 * @param	string	$charset
 	 * @return	bool
 	 */
 	public function accept_charset($charset = 'utf-8')
 	{
 		return in_array(strtolower($charset), $this->charsets(), TRUE);
 	}

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

 	/**
 	 * Parse a custom user-agent string
 	 *
 	 * @param	string	$string
 	 * @return	void
 	 */
 	public function parse($string)
 	{
 		// Reset values
 		$this->is_browser = FALSE;
 		$this->is_robot = FALSE;
 		$this->is_mobile = FALSE;
 		$this->browser = '';
 		$this->version = '';
 		$this->mobile = '';
 		$this->robot = '';

 		// Set the new user-agent string and parse it, unless empty
 		$this->agent = $string;

 		if ( ! empty($string))
 		{
 			$this->_compile_data();
 		}
 	}

 }
	<?php
	/**
	* CodeIgniter
	*
	* An open source application development framework for PHP
	*
	* This content is released under the MIT License (MIT)
	*
	* Copyright (c) 2014 - 2016, 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 - 2016, 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');

	/**
	* User Agent Class
	*
	* Identifies the platform, browser, robot, or mobile device of the browsing agent
	*
	* @package CodeIgniter
	* @subpackage Libraries
	* @category User Agent
	* @author EllisLab Dev Team
	* @link https://codeigniter.com/user_guide/libraries/user_agent.html
	*/
	class CI_User_agent {

	/**
	* Current user-agent
	*
	* @var string
	*/
	public $agent = NULL;

	/**
	* Flag for if the user-agent belongs to a browser
	*
	* @var bool
	*/
	public $is_browser = FALSE;

	/**
	* Flag for if the user-agent is a robot
	*
	* @var bool
	*/
	public $is_robot = FALSE;

	/**
	* Flag for if the user-agent is a mobile browser
	*
	* @var bool
	*/
	public $is_mobile = FALSE;

	/**
	* Languages accepted by the current user agent
	*
	* @var array
	*/
	public $languages = array();

	/**
	* Character sets accepted by the current user agent
	*
	* @var array
	*/
	public $charsets = array();

	/**
	* List of platforms to compare against current user agent
	*
	* @var array
	*/
	public $platforms = array();

	/**
	* List of browsers to compare against current user agent
	*
	* @var array
	*/
	public $browsers = array();

	/**
	* List of mobile browsers to compare against current user agent
	*
	* @var array
	*/
	public $mobiles = array();

	/**
	* List of robots to compare against current user agent
	*
	* @var array
	*/
	public $robots = array();

	/**
	* Current user-agent platform
	*
	* @var string
	*/
	public $platform = '';

	/**
	* Current user-agent browser
	*
	* @var string
	*/
	public $browser = '';

	/**
	* Current user-agent version
	*
	* @var string
	*/
	public $version = '';

	/**
	* Current user-agent mobile name
	*
	* @var string
	*/
	public $mobile = '';

	/**
	* Current user-agent robot name
	*
	* @var string
	*/
	public $robot = '';

	/**
	* HTTP Referer
	*
	* @var mixed
	*/
	public $referer;

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

	/**
	* Constructor
	*
	* Sets the User Agent and runs the compilation routine
	*
	* @return void
	*/
	public function __construct()
	{
	if (isset($_SERVER['HTTP_USER_AGENT']))
	{
	$this->agent = trim($_SERVER['HTTP_USER_AGENT']);
	}

	if ($this->agent !== NULL && $this->_load_agent_file())
	{
	$this->_compile_data();
	}

	log_message('info', 'User Agent Class Initialized');
	}

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

	/**
	* Compile the User Agent Data
	*
	* @return bool
	*/
	protected function _load_agent_file()
	{
	if (($found = file_exists(APPPATH.'config/user_agents.php')))
	{
	include(APPPATH.'config/user_agents.php');
	}

	if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/user_agents.php'))
	{
	include(APPPATH.'config/'.ENVIRONMENT.'/user_agents.php');
	$found = TRUE;
	}

	if ($found !== TRUE)
	{
	return FALSE;
	}

	$return = FALSE;

	if (isset($platforms))
	{
	$this->platforms = $platforms;
	unset($platforms);
	$return = TRUE;
	}

	if (isset($browsers))
	{
	$this->browsers = $browsers;
	unset($browsers);
	$return = TRUE;
	}

	if (isset($mobiles))
	{
	$this->mobiles = $mobiles;
	unset($mobiles);
	$return = TRUE;
	}

	if (isset($robots))
	{
	$this->robots = $robots;
	unset($robots);
	$return = TRUE;
	}

	return $return;
	}

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

	/**
	* Compile the User Agent Data
	*
	* @return bool
	*/
	protected function _compile_data()
	{
	$this->_set_platform();

	foreach (array('_set_robot', '_set_browser', '_set_mobile') as $function)
	{
	if ($this->$function() === TRUE)
	{
	break;
	}
	}
	}

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

	/**
	* Set the Platform
	*
	* @return bool
	*/
	protected function _set_platform()
	{
	if (is_array($this->platforms) && count($this->platforms) > 0)
	{
	foreach ($this->platforms as $key => $val)
	{
	if (preg_match('\|'.preg_quote($key).'\|i', $this->agent))
	{
	$this->platform = $val;
	return TRUE;
	}
	}
	}

	$this->platform = 'Unknown Platform';
	return FALSE;
	}

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

	/**
	* Set the Browser
	*
	* @return bool
	*/
	protected function _set_browser()
	{
	if (is_array($this->browsers) && count($this->browsers) > 0)
	{
	foreach ($this->browsers as $key => $val)
	{
	if (preg_match('\|'.$key.'.*?([0-9\.]+)\|i', $this->agent, $match))
	{
	$this->is_browser = TRUE;
	$this->version = $match[1];
	$this->browser = $val;
	$this->_set_mobile();
	return TRUE;
	}
	}
	}

	return FALSE;
	}

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

	/**
	* Set the Robot
	*
	* @return bool
	*/
	protected function _set_robot()
	{
	if (is_array($this->robots) && count($this->robots) > 0)
	{
	foreach ($this->robots as $key => $val)
	{
	if (preg_match('\|'.preg_quote($key).'\|i', $this->agent))
	{
	$this->is_robot = TRUE;
	$this->robot = $val;
	$this->_set_mobile();
	return TRUE;
	}
	}
	}

	return FALSE;
	}

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

	/**
	* Set the Mobile Device
	*
	* @return bool
	*/
	protected function _set_mobile()
	{
	if (is_array($this->mobiles) && count($this->mobiles) > 0)
	{
	foreach ($this->mobiles as $key => $val)
	{
	if (FALSE !== (stripos($this->agent, $key)))
	{
	$this->is_mobile = TRUE;
	$this->mobile = $val;
	return TRUE;
	}
	}
	}

	return FALSE;
	}

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

	/**
	* Set the accepted languages
	*
	* @return void
	*/
	protected function _set_languages()
	{
	if ((count($this->languages) === 0) && ! empty($_SERVER['HTTP_ACCEPT_LANGUAGE']))
	{
	$this->languages = explode(',', preg_replace('/(;\s?q=[0-9\.]+)\|\s/i', '', strtolower(trim($_SERVER['HTTP_ACCEPT_LANGUAGE']))));
	}

	if (count($this->languages) === 0)
	{
	$this->languages = array('Undefined');
	}
	}

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

	/**
	* Set the accepted character sets
	*
	* @return void
	*/
	protected function _set_charsets()
	{
	if ((count($this->charsets) === 0) && ! empty($_SERVER['HTTP_ACCEPT_CHARSET']))
	{
	$this->charsets = explode(',', preg_replace('/(;\s?q=.+)\|\s/i', '', strtolower(trim($_SERVER['HTTP_ACCEPT_CHARSET']))));
	}

	if (count($this->charsets) === 0)
	{
	$this->charsets = array('Undefined');
	}
	}

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

	/**
	* Is Browser
	*
	* @param string $key
	* @return bool
	*/
	public function is_browser($key = NULL)
	{
	if ( ! $this->is_browser)
	{
	return FALSE;
	}

	// No need to be specific, it's a browser
	if ($key === NULL)
	{
	return TRUE;
	}

	// Check for a specific browser
	return (isset($this->browsers[$key]) && $this->browser === $this->browsers[$key]);
	}

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

	/**
	* Is Robot
	*
	* @param string $key
	* @return bool
	*/
	public function is_robot($key = NULL)
	{
	if ( ! $this->is_robot)
	{
	return FALSE;
	}

	// No need to be specific, it's a robot
	if ($key === NULL)
	{
	return TRUE;
	}

	// Check for a specific robot
	return (isset($this->robots[$key]) && $this->robot === $this->robots[$key]);
	}

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

	/**
	* Is Mobile
	*
	* @param string $key
	* @return bool
	*/
	public function is_mobile($key = NULL)
	{
	if ( ! $this->is_mobile)
	{
	return FALSE;
	}

	// No need to be specific, it's a mobile
	if ($key === NULL)
	{
	return TRUE;
	}

	// Check for a specific robot
	return (isset($this->mobiles[$key]) && $this->mobile === $this->mobiles[$key]);
	}

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

	/**
	* Is this a referral from another site?
	*
	* @return bool
	*/
	public function is_referral()
	{
	if ( ! isset($this->referer))
	{
	if (empty($_SERVER['HTTP_REFERER']))
	{
	$this->referer = FALSE;
	}
	else
	{
	$referer_host = @parse_url($_SERVER['HTTP_REFERER'], PHP_URL_HOST);
	$own_host = parse_url(config_item('base_url'), PHP_URL_HOST);

	$this->referer = ($referer_host && $referer_host !== $own_host);
	}
	}

	return $this->referer;
	}

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

	/**
	* Agent String
	*
	* @return string
	*/
	public function agent_string()
	{
	return $this->agent;
	}

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

	/**
	* Get Platform
	*
	* @return string
	*/
	public function platform()
	{
	return $this->platform;
	}

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

	/**
	* Get Browser Name
	*
	* @return string
	*/
	public function browser()
	{
	return $this->browser;
	}

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

	/**
	* Get the Browser Version
	*
	* @return string
	*/
	public function version()
	{
	return $this->version;
	}

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

	/**
	* Get The Robot Name
	*
	* @return string
	*/
	public function robot()
	{
	return $this->robot;
	}
	// --------------------------------------------------------------------

	/**
	* Get the Mobile Device
	*
	* @return string
	*/
	public function mobile()
	{
	return $this->mobile;
	}

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

	/**
	* Get the referrer
	*
	* @return bool
	*/
	public function referrer()
	{
	return empty($_SERVER['HTTP_REFERER']) ? '' : trim($_SERVER['HTTP_REFERER']);
	}

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

	/**
	* Get the accepted languages
	*
	* @return array
	*/
	public function languages()
	{
	if (count($this->languages) === 0)
	{
	$this->_set_languages();
	}

	return $this->languages;
	}

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

	/**
	* Get the accepted Character Sets
	*
	* @return array
	*/
	public function charsets()
	{
	if (count($this->charsets) === 0)
	{
	$this->_set_charsets();
	}

	return $this->charsets;
	}

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

	/**
	* Test for a particular language
	*
	* @param string $lang
	* @return bool
	*/
	public function accept_lang($lang = 'en')
	{
	return in_array(strtolower($lang), $this->languages(), TRUE);
	}

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

	/**
	* Test for a particular character set
	*
	* @param string $charset
	* @return bool
	*/
	public function accept_charset($charset = 'utf-8')
	{
	return in_array(strtolower($charset), $this->charsets(), TRUE);
	}

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

	/**
	* Parse a custom user-agent string
	*
	* @param string $string
	* @return void
	*/
	public function parse($string)
	{
	// Reset values
	$this->is_browser = FALSE;
	$this->is_robot = FALSE;
	$this->is_mobile = FALSE;
	$this->browser = '';
	$this->version = '';
	$this->mobile = '';
	$this->robot = '';

	// Set the new user-agent string and parse it, unless empty
	$this->agent = $string;

	if ( ! empty($string))
	{
	$this->_compile_data();
	}
	}

	}