protected function detectBrowser($userAgent)
	{
		// Attempt to detect the browser type.  Obviously we are only worried about major browsers.
		if ((stripos($userAgent, 'MSIE') !== false) && (stripos($userAgent, 'Opera') === false))
		{
			$this->browser = self::IE;
			$patternBrowser = 'MSIE';
		}
		elseif ((stripos($userAgent, 'Firefox') !== false) && (stripos($userAgent, 'like Firefox') === false))
		{
			$this->browser = self::FIREFOX;
			$patternBrowser = 'Firefox';
		}
		elseif (stripos($userAgent, 'Chrome') !== false)
		{
			$this->browser = self::CHROME;
			$patternBrowser = 'Chrome';
		}
		elseif (stripos($userAgent, 'Safari') !== false)
		{
			$this->browser = self::SAFARI;
			$patternBrowser = 'Safari';
		}
		elseif (stripos($userAgent, 'Opera') !== false)
		{
			$this->browser = self::OPERA;
			$patternBrowser = 'Opera';
		}

		// If we detected a known browser let's attempt to determine the version.
		if ($this->browser)
		{
			// Build the REGEX pattern to match the browser version string within the user agent string.
			$pattern = '#(?<browser>Version|' . $patternBrowser . ')[/ ]+(?<version>[0-9.|a-zA-Z.]*)#';

			// Attempt to find version strings in the user agent string.
			$matches = array();

			if (preg_match_all($pattern, $userAgent, $matches))
			{
				// Do we have both a Version and browser match?
				if (count($matches['browser']) == 2)
				{
					// See whether Version or browser came first, and use the number accordingly.
					if (strripos($userAgent, 'Version') < strripos($userAgent, $patternBrowser))
					{
						$this->browserVersion = $matches['version'][0];
					}
					else
					{
						$this->browserVersion = $matches['version'][1];
					}
				}
				elseif (count($matches['browser']) > 2)
				{
					$key = array_search('Version', $matches['browser']);

					if ($key)
					{
						$this->browserVersion = $matches['version'][$key];
					}
				}
				else
				// We only have a Version or a browser so use what we have.
				{
					$this->browserVersion = $matches['version'][0];
				}
			}
		}

		// Mark this detection routine as run.
		$this->detection['browser'] = true;
	}