Escape Array in SQL. How to do it?

[eluser]Karman de Lange[/eluser]
array(1,2,3,4,5,6) becomes:
'1','2','3','4','5','6'

Code:

if (is_array($branch_ids))
        {
            foreach ($branch_ids as $key => $branch_id)
            {

                $branch_ids[$key] = $this->db->escape($branch_id);
            }

            $branch_ids = implode(',', $branch_ids);

        }