Multiple record insert incodeigniter

 $decided_fee = $this->input->post('decided_fee');
 $decided_fee_id = $this->input->post('decided_fee_id');
 $count = count($decided_fee);

  for ($i=0; $i<$count; $i++)
  {
  $this->db->where('id', $decided_fee_id[$i]);
  $this->db->update('decidecd_fee ', array('decided_fee'=>$decided_fee[$i]));
  }