[man]date[/man]
switch(date("w")) {
case 1: require_once("page1.php"); break;
case 2: require_once("page2.php"); break;
case 3: require_once("page3.php"); break;
}
or
$req = "page".date("w").".php";
require_once($req);
Or use arrays. There's tons of ways to include the page once you have the date.