Returns an array of WordPress tables.

Returns an empty array.

Returns false.

Returns true.

Returns 0.

Adds the ‘Theme File Editor’ menu item to the bottom of the Appearance (non-block themes) or Tools (block themes) menu.

Default custom background callback.

Kills WordPress execution and displays HTML page with an error message.

Checks an attachment being deleted to see if it’s a header or background image.

Mark a function argument as deprecated and inform when it has been used.