In almost all circumstances, a cookie would be preferable to a transient. WP has a really bad habit of not cleaning up transients properly, so unless your code cleans up after itself (Kills useless transients) they will just sit forever in your DB. Even transients that are set to expire sometimes don’t. In terms of … Read more
Transients are generally cleared when read. If you want to check for this common case, you could catch the pre_transient_transientname and see if it expired, the same way WP is doing: function get_transient( $transient ) { /** * Filter the value of an existing transient. * * The dynamic portion of the hook name, `$transient`, … Read more
How to decode wordpress transient cache stored in database?
Transients can be used but you’d need to make sure they don’t expire earlier than you want. I answered a similar question with a different goal here, but I’ve tried to keep the slightly different answer below self-contained. Option 1 – PHP Sessions I’ve been storing carts within a PHP session which is fine generally … Read more
rule of thumb is probably to use transients for simple objects (strings integers, array) as the result of unserialization of objects might be surprising and side effect might happen unless the object is fully static. IIRC, when unserializing an object PHP will also run its default constructor, which in your case will do the query … Read more
Is using custom table to suit business needs instead of transients a big hit to page load speed?
Store a default value for a transient on plugin activation
WordPress can be inconsistent as to when is returns a WP_Error object and when it just returns false or string(0) when actually there was an error. I am not sure exactly what feedburner is returning that is not triggering a WP_Error from wp_remote_get() – but if you know wp_remote_get() will return an WP_Error, I would … Read more
Transient are not always deleted when they expire, and that makes them unpredictable and sometimes a pain. Whenever I work with transients, I add some kind of functionality to delete the transients when something happens, like I delete transients when publishing posts or updating them if the transient was meant to keep data related to … Read more
Not clear about what exactly is wrong but few comments about things you are doing wrongish transients cache values up to a time so your random game can actually be totally pointless especially if a url is not being frequently fetched, since you use redis the value might expire as part of the memory cleanup … Read more