PostgreSQL PL/pgSQL array_foreach

gistfile1.sql

create function array_foreach(text, anyarray) returns anyarray as $$
declare
	funcname alias for $1;
	vals alias for $2;
	results alias for $0;
begin
	execute format('select array_agg(s.t) from (select %I(unnest($1))) as s(t)', funcname) into results using vals;
	return results;
end;
$$ language plpgsql;