How to redirect ASPpage.asp?id=x to PHPpage.php?id=x

[shine]

I have a dynamic news website written in ASP now I would like to change to PHP server which doesn't support ASP page.I have page like somepage.asp?id=x now how can I redirect the page to somepage.php?id=xand still keep my old visitors pointing the asp page but it will return the same query result in PHP.Example: If my visitor point to this pagewww.someweb.com/ASPpage.asp?id=100they should be redirected to www.someweb.com/PHPpage.php?id=100thanks in advance