[roman]

BrowserInfo Object
(
    [os:private] => Windows
    [name:private] => Google Chrome
    [type:private] => PC
    [family:private] => WEBKIT
    [version:private] => 0.2.149.27
    [userAgent:private] => Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/525.13 (KHTML, like Gecko) Chrome/0.2.149.27 Safari/525.13
    [compatibility:private] => Mozilla
)

¿Has probado get_browser en conjunto con browscap.ini?

// Saludos