Suggested Improvements to Gantry 4 browser/platform detection from user agent

gantrybrowser.class.php

<?php
/**
 * @version   $Id: gantrybrowser.class.php 30069 2016-03-08 17:45:33Z matias $
 * @author    RocketTheme http://www.rockettheme.com
 * @copyright Copyright (C) 2007 - 2016 RocketTheme, LLC
 * @license   http://www.gnu.org/licenses/gpl-2.0.html GNU/GPLv2 only
 *
 * Gantry uses the Joomla Framework (http://www.joomla.org), a GNU/GPLv2 content management system
 *
 */
defined('GANTRY_VERSION') or die();

/**
 * @package    gantry
 * @subpackage core
 */
class GantryBrowser
{
	/**
	 *
	 * @var string The User Agent String for the Browser
	 */
	protected $user_agent;

	/**
	 * @var string the general name of the Browser
	 */
	protected $name;

	/**
	 * @var string the browser version
	 */
	protected $version;

	/**
	 * @var string the short browser version
	 */
	protected $shortversion;

	/**
	 * @var string the OS platform the browser is running on
	 */
	protected $platform;

	/**
	 * @var string the base engine the browser uses
	 */
	protected $engine;

	/**
	 * @var array the additional file checks based on the browser
	 */
	protected $checks = array();

	/**
	 * @param $name
	 *
	 * @return mixed|null
	 */
	public function __get($name)
	{
		switch ($name) {
			case 'checks':
				return null;
				break;
			case 'shortver':
				return $this->shortversion;
				break;
			case 'longver':
				return $this->version;
				break;
			case 'browser':
				return $this->name;
				break;
			default:
				if (property_exists($this, $name) && isset($this->{$name})) {
					return $this->{$name};
				} elseif (method_exists($this, 'get' . ucfirst($name))) {
					return call_user_func(array($this, 'get' . ucfirst($name)));
				} else {
					return null;
				}
		}
	}

	/**
	 *
	 */
	public function __construct()
	{
		$this->user_agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : "unknown";
		$this->checkPlatform();
		$this->checkBrowser();
		$this->checkEngine();
		// add short version
		if ($this->version != 'unknown') $this->shortversion = substr($this->version, 0, strpos($this->version, '.')); else $this->shortversion = 'unknown';
		$this->createChecks();
	}

	/**
	 * @return mixed
	 */
	protected function checkPlatform()
	{
		preg_match('/(CrOS|Tizen|iPhone|iPod|iPad|Android|Mobile|Windows(\ Phone)?|win|Silk|mac|linux|BlackBerry|X11|(New\ )?Nintendo\ (WiiU?|3?DS)|Xbox(\ One))/i', $this->user_agent, $matches);
	
		if (isset($matches[0]))
		{
			return $this->platform = strtolower($matches[0]);
		}

		return $this->platform = 'unknown';
	}

	/**
	 *
	 */
	protected function checkEngine()
	{
		preg_match('/(trident|dillo|blink|edgehtml|gecko|goanna|khtml|martha|netsurf|presto|prince|robin|servo|tkhtml|webkit)/i', $this->user_agent, $matches);
	
		if (isset($matches[0]))
		{
			$this->engine = strtolower($matches[0]);
		}
		else
		{
			$this->engine = 'unknown';
		}
	}

	/**
	 *
	 */
	protected function checkBrowser()
	{
		// IE
		if (preg_match('/msie/i', $this->user_agent) && !preg_match('/opera/i', $this->user_agent))
		{
			$result        = explode(' ', stristr(str_replace(';', ' ', $this->user_agent), 'msie'));
			$this->name    = 'ie';
			//wrap version check in an if statement and check platform token is greater than windows NT 6.1
			if (isset ($result[1]) && preg_match('/windows nt 6[\.1-9]{0,}/i', $this->user_agent))
			{
				$version       = explode(' ', $result[1]);
				//double check if the user agent claims to be IE 7 on Win 7 or above, then force min IE8
				if ($version[0] = 7)
				{
					$this->	version = '8';
				}
				else
				{
					$this->version = $version[0];
				}
			}
			elseif (isset ($result[1]) && preg_match('/windows nt [0-5]{0,}[\.0-9]{0,}/i', $this->user_agent))
			{
				$version       = explode(' ', $result[1]);
				$this->version = $version[0];
			}
			else
			{
				$this->version = 'unknown';
			}

		}
		//IE 11+
		elseif (preg_match("/Trident\/.*rv:([0-9]{1,}[\.0-9]{0,})/i",$this->user_agent,$matches))
		{
			$this->name    = 'ie';
			//wrap version check in an if statement and check platform token is greater than windows NT 6.1
			if (isset ($matches[1]) && preg_match('/windows nt 6[\.1-9]{0,}/i', $this->user_agent))
			{
				$version       = explode(' ', $matches[1]);
				$this->version = $version[0];
			}
			elseif (isset ($result[1]) && preg_match('/windows nt [0-5]{0,}[\.0-9]{0,}/i', $this->user_agent))
			{
				$version       = explode(' ', $result[1]);
				$this->version = $version[0];
			}
			else
			{
				$this->version = 'unknown';
			}
		}
		//Edge
		elseif (preg_match("/Edge\/([\d.]+)/i",$this->user_agent,$matches))
		{
			$this->name    = 'edge';
			//wrap version check in an if statement and check platform token is greater than windows NT 10.0
			if (isset ($matches[1]) && preg_match('/windows nt 10[\.0-9]{0,}/i', $this->user_agent))
			{
				$version       = explode(' ', $matches[1]);
				$this->version = $version[0];
			}
			elseif (isset ($result[1]) && preg_match('/windows nt [0-9]{0,}[\.0-9]{0,}/i', $this->user_agent))
			{
				$version       = explode(' ', $result[1]);
				$this->version = $version[0];
			}
			else
			{
				$this->version = 'unknown';
			}
		}
		// if user agent could be identified as MS Word.
		elseif (preg_match('/(\bWord\b|ms-office|MSOffice|Microsoft Office|sms-office|office)/i', $this->user_agent))
		{
			$result        = explode('/', stristr($this->user_agent, 'Microsoft Office'));
			$version       = explode(' ', $result[1]);
			$this->name    = 'office';
			$this->version = $version[0];
		}
		// Firefox
		elseif (preg_match('/Firefox/', $this->user_agent))
		{
			$result        = explode('/', stristr($this->user_agent, 'Firefox'));
			$version       = explode(' ', $result[1]);
			$this->name    = 'firefox';
			$this->version = $version[0];
		}
		// Minefield
		elseif (preg_match('/Minefield/', $this->user_agent))
		{
			$result        = explode('/', stristr($this->user_agent, 'Minefield'));
			$version       = explode(' ', $result[1]);
			$this->name    = 'minefield';
			$this->version = $version[0];
		}
		// Chrome
		elseif (preg_match('/Chrome/', $this->user_agent))
		{
			$result        = explode('/', stristr($this->user_agent, 'Chrome'));
			$version       = explode(' ', $result[1]);
			$this->name    = 'chrome';
			$this->version = $version[0];
		}
		//Safari
		elseif (preg_match('/Safari/', $this->user_agent) && !preg_match('/iPhone/', $this->user_agent) && !preg_match('/iPod/', $this->user_agent) && !preg_match('/iPad/', $this->user_agent))
		{
			$result     = explode('/', stristr($this->user_agent, 'Version'));
			$this->name = 'safari';
			if (isset ($result[1])) {
				$version       = explode(' ', $result[1]);
				$this->version = $version[0];
			} else {
				$this->version = 'unknown';
			}
		}
		// Opera
		elseif (preg_match('/opera/i', $this->user_agent))
		{
			$result = stristr($this->user_agent, 'opera');

			if (preg_match('/\//', $result))
			{
				$result        = explode('/', $result);
				$version       = explode(' ', $result[1]);
				$this->name    = 'opera';
				$this->version = $version[0];
			}
			else
			{
				$version       = explode(' ', stristr($result, 'opera'));
				$this->name    = 'opera';
				$this->version = $version[1];
			}
		}
		// iPod
		elseif (preg_match('/iPod/', $this->user_agent))
		{
			$result     = explode('/', stristr($this->user_agent, 'Version'));
			$this->name = 'ipod';
			if (isset ($result[1])) {
				$version       = explode(' ', $result[1]);
				$this->version = $version[0];
			} else {
				$this->version = 'unknown';
			}
		}
		// iPhone
		elseif (preg_match('/iPhone/', $this->user_agent))
		{
			$result     = explode('/', stristr($this->user_agent, 'Version'));
			$this->name = 'iphone';
			if (isset ($result[1])) {
				$version       = explode(' ', $result[1]);
				$this->version = $version[0];
			} else {
				$this->version = 'unknown';
			}
		}
		// iPad
		elseif (preg_match('/iPad/', $this->user_agent))
		{
			$result     = explode('/', stristr($this->user_agent, 'Version'));
			$this->name = 'ipad';
			if (isset ($result[1])) {
				$version       = explode(' ', $result[1]);
				$this->version = $version[0];
			}
			else
			{
				$this->version = 'unknown';
			}
		}
		// Android
		elseif (preg_match('/Android/', $this->user_agent))
		{
			$result     = explode('/', stristr($this->user_agent, 'Version'));
			$this->name = 'android';
			if (isset ($result[1]))
			{
				$version       = explode(' ', $result[1]);
				$this->version = $version[0];
			}
			else
			{
				$this->version = "unknown";
			}
		}
		else
		{
			$this->name    = "unknown";
			$this->version = "unknown";
		}
	}

	/**
	 *
	 */
	protected function createChecks()
	{
		$this->_checks = array(
			'', // filename
			'-' . $this->name, // browser check
			'-' . $this->platform, // platform check
			'-' . $this->engine, // render engine
			'-' . $this->name . '-' . $this->platform, // browser + platform check
			'-' . $this->name . $this->shortversion, // short browser version check
			'-' . $this->name . $this->version, // longbrowser version check
			'-' . $this->name . $this->shortversion . '-' . $this->platform, // short browser version + platform check
			'-' . $this->name . $this->version . '-' . $this->platform // longbrowser version + platform check
		);
	}

	/**
	 * @param      $file
	 * @param bool $keep_path
	 *
	 * @return array
	 */
	public function getChecks($file, $keep_path = false)
	{
		$checkfiles = array();
		$ext        = substr($file, strrpos($file, '.'));
		$path       = ($keep_path) ? dirname($file) . '/' : '';
		$filename   = basename($file, $ext);
		foreach ($this->_checks as $suffix)
		{
			$checkfiles[] = $path . $filename . $suffix . $ext;
		}

		return $checkfiles;
	}


}