phpUserAgentStringParser::doParse PHP Method

    protected function doParse($userAgentString)
    {
        $userAgent = array('string' => $this->cleanUserAgentString($userAgentString), 'browser_name' => null, 'browser_version' => null, 'operating_system' => null, 'engine' => null);
        if (empty($userAgent['string'])) {
            return $userAgent;
        }
        // build regex that matches phrases for known browsers
        // (e.g. "Firefox/2.0" or "MSIE 6.0" (This only matches the major and minor
        // version numbers.  E.g. "2.0.0.6" is parsed as simply "2.0"
        $pattern = '#(' . join('|', $this->getKnownBrowsers()) . ')[/ ]+([0-9]+(?:\\.[0-9]+)?)#';
        // Find all phrases (or return empty array if none found)
        if (preg_match_all($pattern, $userAgent['string'], $matches)) {
            // Since some UAs have more than one phrase (e.g Firefox has a Gecko phrase,
            // Opera 7,8 have a MSIE phrase), use the last one found (the right-most one
            // in the UA).  That's usually the most correct.
            $i = count($matches[1]) - 1;
            if (isset($matches[1][$i])) {
                $userAgent['browser_name'] = $matches[1][$i];
            }
            if (isset($matches[2][$i])) {
                $userAgent['browser_version'] = $matches[2][$i];
            }
        }
        // Find operating system
        $pattern = '#' . join('|', $this->getKnownOperatingSystems()) . '#';
        if (preg_match($pattern, $userAgent['string'], $match)) {
            if (isset($match[0])) {
                $userAgent['operating_system'] = $match[0];
            }
        }
        // Find engine
        $pattern = '#' . join('|', $this->getKnownEngines()) . '#';
        if (preg_match($pattern, $userAgent['string'], $match)) {
            if (isset($match[0])) {
                $userAgent['engine'] = $match[0];
            }
        }
        return $userAgent;
    }