Determines whether the query is for an existing custom taxonomy archive page.

Formerly used to escape strings before searching the DB. It was poorly documented and never worked as described.

Adds the media button to the editor.

Saves a file submitted from a POST request and create an attachment post for it.

Adds image HTML to editor.

Retrieves the single non-image attachment fields to edit form fields.

Outputs the legacy media upload form.

Handles form submissions for the legacy media uploader.

Retrieves the legacy media uploader form in an iframe.

Adds gallery form to upload iframe.