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PHP or not doesn't matter. That's fine for all of the standards compliant browsers. The tricky part is that for IE you need to tell it to not cache in three different ways in order for it to be reliable.
For older versions of IE, that needs to include in the <head> which must be placed at the ends of the document, or at very least place the caching adjectives at the end of the head. The problem is that since IE doesn't cache anything less than 512 bytes anyway, so when it refs the headers it hasn't yet decided to turn on cache, so that's too early to turn off the cache.
On the other hand, IE doesn't know how to handle the Vary header, so it skips when thete is any Vary header. If you set it to Vary on hostname or URL that shouldn't hurt anything because OF COURSE different URLs have different content, but IE isn't smart enough to figure that out, so it skips caching.
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