Closes the cache.

Removes the cache contents matching key and group.

Removes all cache items.

Retrieves the cache contents from the cache by key and group.

Sets up Object Cache Global and assigns it.

Replaces the contents of the cache with new data.

Saves the data to the cache.

Create categories for the given post.

Add a new category to the database if it does not already exist.

Provides a simpler way of inserting a user into the database.