#1 Don't use short open tags.

[Mikael Magnusson]

According to php.ini short open tags should be avoided:
--
NOTE: Using short tags should be avoided when
developing applications or
libraries that are meant for redistribution, or
deployment on PHP
servers which are not under your control, because short
tags may not
be supported on the target server. For portable,
redistributable code,
be sure not to use short tags.
--

Regards
Mikael Magnusson

[Mikael Magnusson]