Title: Temp disabling all caching within a specific function? Last modified: January 4, 2022 --- # Temp disabling all caching within a specific function? * Resolved [sx1001](https://wordpress.org/support/users/sx1001/) * (@sx1001) * [4 years, 5 months ago](https://wordpress.org/support/topic/temp-disabling-all-caching-within-a-specific-function/) * Hi all, * we have several functions which I start as admin on demand (using GET parameters) which act based on user-meta data. * We have seen lately that, because W3 is active, “old” metadata was used (because metadata uses WP Object caching) which kinda rendered those functions partially useless. * Do you “pay attention” if I simply switch wp_using_ext_object_cache(false) during runtime, is this a solution for WP Object Caching deactivation? * And how to change behaviour of your DB caching? Can I simply override the variable $cache_reject_reason and set it to a value != null, e.g. $wpdb->cache_reject_reason = ‘cronjob’? That should deactivate as well, correct? * I now created a function which disables object cache, sets all constants, adds a dbcan filter and also sets the value of the rejected_reason of the active processor within the DB-CachedQuery instance, what do you think? Is this complete? * ``` function temp_disable_all_w3cache() { # Disable WP Obj Caching ... wp_using_ext_object_cache(false); # Disable W3 Constants (not sure whether they are recognized during runtime) $cons = array( 'DONOTCACHEPAGE', 'DONOTCACHEDB', 'DONOTMINIFY', 'DONOTCDN', 'DONOTCACHCEOBJECT', 'DONOTCACHEPAGE' ); foreach($cons as $c) { if(!defined($c)) define($c, true); } # Add Filter w3tc_dbcache_can_cache_sql add_filter('w3tc_dbcache_can_cache_sql', function() { return 'DONT_CACHE_MY_CRONS'; }); ########## CHANGE CACHE REJECT REASON for DB CACHING... // Create the closure by reference // https://stackoverflow.com/a/17560595/701049 $reader = function & ($object, $property) { $value = & Closure::bind(function & () use ($property) { return $this->$property; }, $object, $object)->__invoke(); return $value; }; global $wpdb; try { $active_processor = & $reader($wpdb, 'active_processor'); # GET property by reference ... to be able to change it $reject_reason = & $reader($active_processor, 'cache_reject_reason'); # GET property by reference ... to be able to change it $reject_reason = 'DOING_CRON'; # Change private property by reference -> modifies original WPDB } catch (Exception $e) {} } ``` * Thanks so much Viewing 9 replies - 1 through 9 (of 9 total) * Plugin Contributor [Marko Vasiljevic](https://wordpress.org/support/users/vmarko/) * (@vmarko) * [4 years, 5 months ago](https://wordpress.org/support/topic/temp-disabling-all-caching-within-a-specific-function/#post-15218104) * Hello [@sx1001](https://wordpress.org/support/users/sx1001/) * Thank you for reaching out. Let me try and test this and check the behavior and I’ll get back to you with more info. Thanks! * Thread Starter [sx1001](https://wordpress.org/support/users/sx1001/) * (@sx1001) * [4 years, 5 months ago](https://wordpress.org/support/topic/temp-disabling-all-caching-within-a-specific-function/#post-15221683) * Hi Marko, thanks, I’ll wait for your feedback 🙂 * Plugin Contributor [Marko Vasiljevic](https://wordpress.org/support/users/vmarko/) * (@vmarko) * [4 years, 5 months ago](https://wordpress.org/support/topic/temp-disabling-all-caching-within-a-specific-function/#post-15221883) * Hello [@sx1001](https://wordpress.org/support/users/sx1001/) * W3TC does not check the global used by [https://developer.wordpress.org/reference/functions/wp_using_ext_object_cache/](https://developer.wordpress.org/reference/functions/wp_using_ext_object_cache/). WordPress may ignore the external object cache if it is disabled that way. You have a typo `DONOTCACHCEOBJECT` it should be `DONOTCACHEOBJECT`. That should work if your function is run early enough in the WP loop of actions and filters. The `w3tc_dbcache_can_cache_sql` filter is used to set a reject reason. This will not disable the DB Cache; it’s used for the comment in the debug HTML comment on pages. The closure by reference part may work — needs testing so you may want to check and test this on your end. I hope this helps! Thanks! * Thread Starter [sx1001](https://wordpress.org/support/users/sx1001/) * (@sx1001) * [4 years, 5 months ago](https://wordpress.org/support/topic/temp-disabling-all-caching-within-a-specific-function/#post-15222176) * Hi Marko, * thanks for getting back to me. * The basic question is: Even if W3 does not consider wp_using_ext_object_cache, after I use it, does WP ignore the global object cache (i.e. W3TC) and therefore directly take everything from the DB instead of relying on wp_cache_set/add/get? * If not – than how else to disable Object cache during runtime? * Thanks! * Thread Starter [sx1001](https://wordpress.org/support/users/sx1001/) * (@sx1001) * [4 years, 5 months ago](https://wordpress.org/support/topic/temp-disabling-all-caching-within-a-specific-function/#post-15224776) * Hi [@vmarko](https://wordpress.org/support/users/vmarko/), * I checked once more: During Runtime, somewhere in wp_head action, I called temp_disable_all_w3cache() and than I queried a value from the DB which I changed using Phpmyadmin beforehand. * Unfortunately the new value was not retrieved until I purged the W3 TC Cache overall! * Please assist me, this is a MUST HAVE functionality, to be able to temporarly disable caching somehow. And be it in a ugly way by changing the wpdb back to its original Object -> the main thing, that this CAN be done. * Thanks in advance! * Plugin Contributor [Marko Vasiljevic](https://wordpress.org/support/users/vmarko/) * (@vmarko) * [4 years, 5 months ago](https://wordpress.org/support/topic/temp-disabling-all-caching-within-a-specific-function/#post-15225726) * Hello [@sx1001](https://wordpress.org/support/users/sx1001/) * `define('DONOTCACHEDB', true);` should work, but has to be defined before the DB cache file is run. You can also try define( ‘W3TC_IN_MINIFY’, true ); to disable everything. Thanks! * Thread Starter [sx1001](https://wordpress.org/support/users/sx1001/) * (@sx1001) * [4 years, 5 months ago](https://wordpress.org/support/topic/temp-disabling-all-caching-within-a-specific-function/#post-15227897) * Hi, * unfortunately this does not work “somewhere” in the middle of the code during Runtime. * For us, this is a MUST HAVE feature, to be able to temporarly disable caching somehow DURING runtime, not via very early dropin disabling… * But if it’s simply not possible, alright than… * Thread Starter [sx1001](https://wordpress.org/support/users/sx1001/) * (@sx1001) * [4 years, 5 months ago](https://wordpress.org/support/topic/temp-disabling-all-caching-within-a-specific-function/#post-15227954) * I’m not 100% sure yet, but I think, this did the trick: * ``` # Disable WP Obj Caching ... wp_using_ext_object_cache(false); wp_cache_flush(); wp_cache_init(); ``` * All subsequent function calls will have an EMPTY WP Object Cache, hence re-reading from DB. * Plugin Contributor [Marko Vasiljevic](https://wordpress.org/support/users/vmarko/) * (@vmarko) * [4 years, 5 months ago](https://wordpress.org/support/topic/temp-disabling-all-caching-within-a-specific-function/#post-15235331) * Hello [@sx1001](https://wordpress.org/support/users/sx1001/) * Thank you for the information. Glad to know you managed to find the solution. Thanks! Viewing 9 replies - 1 through 9 (of 9 total) The topic ‘Temp disabling all caching within a specific function?’ is closed to new replies. * ![](https://ps.w.org/w3-total-cache/assets/icon-256x256.png?rev=1041806) * [W3 Total Cache](https://wordpress.org/plugins/w3-total-cache/) * [Frequently Asked Questions](https://wordpress.org/plugins/w3-total-cache/#faq) * [Support Threads](https://wordpress.org/support/plugin/w3-total-cache/) * [Active Topics](https://wordpress.org/support/plugin/w3-total-cache/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/w3-total-cache/unresolved/) * [Reviews](https://wordpress.org/support/plugin/w3-total-cache/reviews/) * 9 replies * 2 participants * Last reply from: [Marko Vasiljevic](https://wordpress.org/support/users/vmarko/) * Last activity: [4 years, 5 months ago](https://wordpress.org/support/topic/temp-disabling-all-caching-within-a-specific-function/#post-15235331) * Status: resolved