Server Side Browser Detection

<?
function inAgent($agent) {    
	$notAgent = strpos($_SERVER['HTTP_USER_AGENT'],$agent) === false;
	return !$notAgent;
}

function isIE() {
	if (inAgent('MSIE') && !isOpera()) {
		return true;
	}
	return false;
}

function isSafari() {
	$br = new Browser;
	if ($br->Platform == "MacIntosh"||inAgent('Safari')) {
		return true;
	}
	return false;
}

function isFF() {
	if (inAgent('Firefox')) {
		return true;
	}
	return false;
}

function isNS4() {
	if ((!inAgent('MSIE')) && (inAgent('Mozilla/4'))) {
		return true;
	}
	return false;
}

function isIE7() {
	if (inAgent('MSIE 7') && !inAgent('Opera')) {
		return true;
	}
	return false;
}

function isOpera() {
	if (inAgent('Opera')) {
		return true;
	}
	return false;
}
?>