Code valid in both PHP and SSI

In a project that I’m working on, web pages are generated, and sent by FTP to a remote server. Some of those pages are simple HTML pages, others SHTML (i.e.: use server side include, or SSI, to include some blocks of information), and some others are PHP pages.

I’ve been in a case where a given block of code would have to be used both by SHTML and by PHP page. I can generated any code that I’d like, but the same code must be used for the PHP and SHTML blocks. In addition, it would be nice if this block, when seen directly as HTML (no PHP neither SSI parsing), would display correctly.
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