>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #916552. --> Reported by: [brian_c](https://www.drupal.org/user/67952) >>> <p>I have written a new D6 module called "Dynamic Cache" which allows other modules to disable Drupal's standard caching from hook_boot(), for any arbitrary runtime conditions.</p> <p>Due to the execution sequence of Drupal's bootstrap system, it is not normally possible to disable standard page caching from hook_boot(), because the cached page is already loaded before hook_boot() is invoked.</p> <p>Page caching can be disabled on a per-page basis easily enough though programmatic methods, or the cacheexclude module. However there is no way of disabling the cache on a per-user basis (ie, disable cache for a given page, for some anonymous users but not others), except for manipulating global variables in settings.php.</p> <p>You can see a discussion about this issue here: <a href="http://drupal.org/node/322104">http://drupal.org/node/322104</a>. It has not been resolved, even for D7, much less D6.</p> <p>We have found a way to bypass this limitation, by essentially "hijacking" (ie, not returning to) Drupal's normal bootstrap process, and completing the rest of it ourselves. This is actually much simpler than it sounds, and works perfectly.</p> <p>We have been using this technique without issue (in fact it immediately solved all of our caching issues) on a busy, live production site for some time now, and I would now like to contribute it to the community. I believe it to be a simple, original, and ingenious solution to a limitation of Drupal's standard caching mechanism, with extremely wide applicability. Hopefully this same method will also work for D7, however that is not something I have examined at this time.</p> <p>I posted preliminary details on this technique in the forums (<a href="http://drupal.org/node/875152">http://drupal.org/node/875152</a>), but have now taken the time to turn it into a standalone module. I have done my best to follow Drupal's coding conventions, wrote a detailed README.txt, and implemented an install hook to ensure a very high module weight, since Dynamic Cache's hook_boot() must run after any other module's hook_boot().</p> <p>I have been involved in the Drupal community in some form or another for over four years (often providing help on forums and issue queues) and have built dozens of sites from very small to very large. I recently attended DrupalCon Copenhagen where I had the great pleasure of meeting Dries, webchick, and many others, and found myself inspired and encouraged to contribute more actively back to the community. I was a presenter at DrupalCamp Alberta 2010 last weekend, and will be attending the Pacific Northwest Drupal Summit in a couple weeks.</p> <ul> <li><strong>Sandbox:</strong> <a href="http://drupal.org/sandbox/brian_c/1413374">http://drupal.org/sandbox/brian_c/1413374</a></li> <li><strong>Git repo:</strong> <a href="http://git.drupal.org/sandbox/brian_c/1413374.git">http://git.drupal.org/sandbox/brian_c/1413374.git</a> (<a href="http://ventral.org/pareview/httpgitdrupalorgsandboxbrianc1413374git">PAReview</a>)</li> <li><strong>Drupal core version:</strong> 6.x</li> </ul>