Function: Returns null.

Function: Returns an empty string.

Function: Strips close comment and close php tags from file headers used by WP.

Function: Permanently deletes comments or posts of any type that have held a status of ‘trash’ for the number of days defined in EMPTY_TRASH_DAYS.

Function: Retrieves metadata from a file.

Function: Guesses the URL for the site.

Function: Temporarily suspends cache additions.

Function: Suspends cache invalidation.