protected static function engine()
{
if (preg_match('#(apachebench|dillo|gecko|khtml|presto|trident|up\\.browser|webkit|libwww|java)[\\/ ]([0-9]+(\\.[0-9]+)?)#', self::$ua, $match) || preg_match('#(msie|opera)[\\/ ]([0-9]+(\\.[0-9]+)?)#', self::$ua, $match)) {
/*
* IE9 and IE8 includes Trident version in their UA so we only look for empty ones
* IE8 in compatibility mode identify itself as IE7 but leaves trident/4.0 in the UA
*/
if ('msie' === $match[1] || 'trident' === $match[1] && false !== strpos(self::$ua, 'msie 7')) {
self::$engine = 'trident';
self::$engineV = 3;
} else {
if ('opera' == $match[1]) {
$match[1] = 'presto';
}
self::$engine = $match[1];
self::$engineV = floatval($match[2]);
}
}
}
