Maybe I'm being dense, but why not set it to what you want it to be?
Clearing it is leaving the decision up to the browser which will not
necessarily have the effect you want for all users.
Incidentally, it might not be possible if Apache is setting it. Not sure
if PHP has the ability to override headers being sent by Apache.
The two have different effects. The Expires: header proclaims that the
page is good for x hours/minutes/days etc. Whereas the browser can use
the Last-Modified header to figure the staleness for itself. If its
newer than the copy it has, it needs to download the newer copy.
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