I want to redirect a url http://abc.xyz.com/123 to http://www.xyz.com. So the file that will be accessed will be index.php of xyz.com. That index.php should have available to it both abc and 123 (so 123 will be $SERVER['PHP_SELF'], and abc will come out of $SERVER['HTTP_HOST']) to enable appropriate processing.
http://abc.xyz.com already goes to http://www.xyz.com (though configuration by my service provider), and abc can be extracted out of $_SERVER['HTTP_HOST']. However, http://abc.xyz.com/123 seems to be looking for a folder called 123 in the root directory of xyz.com, and is showing up a 404 error when it cannot find any.
Can someone kindly give me the line(s) to be put in .htaccess to enable http://abc.xyz.com/123 to call index.php of http://www.xyz.com (with 123 being available though $_SERVER['PHP_SELF']? I cannot seem to get it to work.
Thank you very much for your time!