Laravel orderBy with column value
You should be able to do this with an IF statement.
$programmefundings = Programmefunding::where('status', '!=', 'draft') ->orderByRaw("FIELD(status , 'open', 'announced', 'delayed', 'closed') ASC") ->orderByRaw("IF(status = 'announced', accouncement_date, date_start) DESC") ->get();
I think what you are looking to do is something like this. It will orderby all items with a status of announced first by announcement date, then it will sort everything else by date_start.
$programmefundings = Programmefunding::where('status', '!=', 'draft') ->orderByRaw("case when status = 'announced' then announcement_date end asc") ->orderBy('date_start', 'desc')->get();