Sending a multi-part email with ZendMail is easy enough, but if you want to send an HTML email with a text alternative, you need to remember to set the content-type in the headers to multipart/alternative. As this is the second time I had to work this out, I'm noting it here for the next time I forget!

The rest of the post is the code you'll need to send a simple email with a text and HTML body sections, configure the headers (to, from, etc) and the "multipart/alternative" header to make the HTML or plain text switching work correctly.

While setting some svn properties at work, we wondered about the correct MIME type for .php files.

He found several in the official IANA list including "text/php", "application/php" and "application/x-http-php" - all valid but none of them considered a standard. He talks about the ones supported by linux distributions (like Debian/Ubuntu) and some reasoning that might make "application/php" the best choice of the list. He points out some downsides to the choice, though, including the fact that something starting with "application/" should considered "machine readable" only despite PHP just being text.