WordPress transients

Since WordPress 2.8, a new kind of caching mechanism has been added to WordPress. it is not very well documented yet (I could not find any relevant page in the Codex. Please leave a comment if you find one).
According to this WordPress core development trac discussion, that feature has been introduced so that “non-persistent” or otherwise “short-lived” data that used to be stored in the “options” database table can be distinguished from “real options data” that is meant to be persistent (ie, live forever in the database until it is updated or erased).
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