kartik\helpers\Enum::getBrowserVer PHP Method

    protected static function getBrowserVer($agent, $code)
    {
        $version = '?';
        $pattern = '#(?<browser>' . $code . ')[/v ]+(?<version>[0-9]+(?:\\.[0-9]+)?)#';
        if ($code == 'blackberry') {
            $pattern = '#(?<browser>' . $code . ')[/v0-9 ]+(?<version>[0-9]+(?:\\.[0-9]+)?)#';
        }
        if (preg_match_all($pattern, strtolower($agent), $matches)) {
            $i = count($matches['browser']) - 1;
            $ver = [$matches['browser'][$i] => $matches['version'][$i]];
            $version = empty($ver[$code]) ? '?' : $ver[$code];
        }
        return $version;
    }