Registers the form callback for a widget.

Registers the update callback for a widget.

Recursively computes the intersection of arrays using keys for comparison.

Add additional default image sub-sizes.

Builds Unique ID for storage and retrieval.

Updates the attached file and image meta data when the original image was edited.

Low-level function to create image sub-sizes.

Was used to add options for the privacy requests screens before they were separate files.

Adds a submenu page to the Comments main menu.

Adds a submenu page to the Dashboard main menu.