On Mon, 2007-04-16 at 14:22 -0400, William Case wrote:
> I am working on web site made up of files that combine HTML and PHP.  My
> main interest is in the PHP coding.  Is there a relatively easy way to
> set the font-lock colors for the tags (constants) that distinguishes
> between a HTML tag and a PHP tag when I am in php-mode. 
> 
> In case I am misusing terminology, by tag I mean expressions like
> <p> ... </p> in HTML; <?php ... ?> in PHP.

The attached elisp file uses mmm-mode, psgml html mode, and php-mode
(which I obtained from Debian or via a google search) to make it do what
you want.  I have not used the php stuff in there very much, so it will
probably need a small amount of work.