PHP session_cache_limiter() private and nocache HTTP Expires date question -

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if @ php doc function session_cache_limiter(), see if cache_limiter parameter set private or nocache expires http header set const date (thu, 19 nov 1981 08:52:00 gmt). understand date in past avoid caching, why date/time in particular? it's not 0 date, guess kind of easter egg. if it's kind of dummy value in past, can change else (still in past) , still have private/nocache mechanism still working?

it birthday of person contributed code:

diffs: http://cvs.php.net/viewvc.cgi/php-src/ext/session/session.c?r1=1.80&r2=1.81

http://www.phpbuilder.com/lists/php3-list/199911/3159.php

to change it, preferable set headers manually, example nocache sets this:

expires: thu, 19 nov 1981 08:52:00 gmt cache-control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 pragma: no-cache

but still do:

session_cache_limiter('nocache') header('expires: thu, 1 jan 2000 00:00:00 gmt');

header replace existing header same name (by default).


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