Call major cache updating functions for list of Post objects.

Updates a post meta field based on the given post ID.

Updates metadata cache for list of post IDs.

Add tags to a post.

Adds a trashed suffix for a given post.

Adds a suffix if any trashed posts have a given slug.

Fires actions after a post, its terms and meta data has been saved.

Verifies an attachment is of a given type.

Determines whether an attachment is an image.

Sets the last changed time for the ‘posts’ cache group.