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How do you create a transient in WordPress?
By using the set_transient () function we can create a transient. The function takes two required and one optional parameter. The first one is the name of the transient, the second is the value, the third is the expiration time. When the code above is executed it stored my current mood for 28800 seconds (8 hours).
Why is my transient key not stored in WordPress?
Because if you make your transient key longer than 40 characters, WordPress might not store the transient. This is because of a character limit in the options table in the WordPress database. It can be really, really easy to exceed this limit once you start prefixing, adding a version number, and adding some args.
When to use a transient in a database?
For this reason, transients should be used to store any data that is expected to expire, or which can expire at any time. Transients should also never be assumed to be in the database, since they may not be stored there at all. Furthermore, it is possible for the transient to not be available before the expiration time.
How is the transients API similar to the options API?
The Transients API is very similar to the Options API but with the added feature of an expiration time, which simplifies the process of using the wp_options database table to temporarily store cached information.
What happens if the transient name does not exist?
If the transient does not exist, does not have a value, or has expired, then the return value will be false. (string) (Required) Transient name. Expected to not be SQL-escaped. (mixed) Value of transient.
What does the return value of get transient mean?
Returned value is the value of transient. If the transient does not exist, does not have a value, or has expired, then get_transient will return false.
Is the expiration date of a transient set to 0?
Since the expiration is set to 0 the transient is autoloaded which is perfect if we want to show it on all pages. If you only show the widget on your about page there really is no need to autoload the transient. In this case it is better to give it an extremely large expiration date like 3153600000 which would be 100 years.
What’s the length limit for set transient in WordPress?
In WordPress versions previous to 4.4, the length limitation was 45 in set_transient (now 172) and 64 in the database (now 191). Introduced.