Get the value from DropDown list [RESOLVED]

The solution you've found, has nothing to do with CodeIgniter.
If you set up CI correctly, you can use the Query Builder to make it a lot easier:

PHP Code:

$sum1 = $this->input->get('id');
$this->db->sum('estimated_hours','value_sum');
$this->db->where('milestone_id', $sum1);
$sum = $this->db->get()->row()->value_sum; 


$this->db is the database connection CodeIgniter is using.
Please read the Database Reference: http://www.codeigniter.com/userguide3/da...index.html