i dont quite understand it?! do you want to send the blah.php itself or a nice formatted html site that comes out of blah.php?
if you want the first you can just read the file on the FS and put the output in a var and echo that var in the body of the mail.
If you want the last just let the site generate a nice html code and put the output in a var and echo that var in the body of hte mail.
If you mean something else.. let me know..
Jordy