Translations:Manual:Hooks/GetPreferences/30/en

Most preferences are stored in the same format as is used by the HTMLFormField, but in the case of  a transformation should be carried out from a newline-separated list of usernames (which is what the form widget works with) and a newline-separated list of user IDs (which is what gets stored in the database). See the treatment of  (in core) or   (in Echo) for examples of this.