As more and more Web pages become database-driven and dynamic, it will be important that Web browsers display the most up-to-date information available from your site. The author notes "For those who have been in the PHP field for some time, dealing with this issue is nothing new. The problem itself has nothing to do with PHP at all. Rather, it is the client's browser that is the source." This article addresses such topics as PHP and Browser Caches and Cache Controlling Headers.