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+====== Website Optimization ======
+  * [[Optimization]]
+  * [[http://us.php.net/manual/en/function.session-cache-limiter.php|PHP: session_cache_limiter]]
+==== PHP Caching ====
+Anytime PHP uses a session, it applies the setting in ''session_cache_limiter'' in the PHP configuration.  This setting sends HTTP headers which directly affect the browser's caching.
+Caching is disabled by default when sessions are used.  The preferred approach would be to set it globally to ''public'', and have pages that need real-time data disable it using ''session_cache_limiter''.
+The length that the browser is told to cache its contents is set by the ''session.cache_expire'' setting in the PHP config.  The default value is 180 minutes (3 hours).  Use ''session_cache_expire'' to override the value.
+Here are the headers each setting sends:
+**nocache (default)**
+Disables caching in the browser completely.
+<code>
+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
+</code>
+**public (preferred)**
+Lets the browser cache the contents of the webpage.
+<code>
+Expires: (sometime in the future, according session.cache_expire)
+Cache-Control: public, max-age=(sometime in the future, according to session.cache_expire)
+Last-Modified: (the timestamp of when the session was last saved)
+</code>
+**private**
+Prefers that a proxy handle caching.
+<code>
+Expires: Thu, 19 Nov 1981 08:52:00 GMT
+Cache-Control: private, max-age=(session.cache_expire in the future), pre-check=(session.cache_expire in the future)
+Last-Modified: (the timestamp of when the session was last saved)
+</code>

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