<?
$id_style_mobile = 3;

function isMobile() {
    return preg_match("/(android|avantgo|blackberry|bolt|boost|cricket|docomo|fone|hiptop|mini|mobi|palm|phone|pie|tablet|up.browser|up.link|webos|wos)/i", $_SERVER["HTTP_USER_AGENT"]);
}
if(isMobile() and $_COOKIE['style_default'] !=$id_style_mobile)
{
setcookie('style_default',$id_style_mobile,time()+55555);
header("location: index.php");
}
?>