如何在用户进入主页面时显示用户随机子网页（index.php）？

I have a domain registered, e.g. mydomain.com . I would like to put there some php page (or whatever - html with jquery?, etc?) that would have a small script - when user enters this page, he will be immediately randomly redirected to one of my subpages (that are also on the same level as index.php, for example first.php, second.php, third.php) - is that achievable?I have a domain registered, e.g. mydomain.com .