PHP command for redirect?

Hi, I'm setting up an error checking element to a registration site and would like to redirect the user to a certain page if they missed any fields on the previous registration page ... the problem is I can't seem to find a redirect command for PHP. I was using the header command, but its giving me attitude now that I've also got the script setup to send an email to the admins if a form is filled out incorrectly. I just went through the list of commands on the PHP website - but without really knowing what kind of name I'm looking for ... well, it wasn't all that enlightening. Thanks -Tim