Use this code to hide certain fields when users are creating an entry (show field(s) only when editing). The fields will still be visible in the admin area when creating entries.

If you would like to only allow an entry to be edited once, we can compare the updated and the creation dates. If they are different, the entry has already been edited. In order for this to work, you should enable editing in your form settings, and this code will prevent the editing. Keep in mind editing could also be done automatically