Updating Multiple Rows in Codeigniter
In your Model following part should be
$data[] = array( $code='code' => $_POST['code'][$i], 'price' => $_POST['sell']);replaced with
$data[] = array( 'code' => $_POST['code'][$i], 'price' => $_POST['sell']);and to update the values you should use update_batch instead of insert_batch
$this->db->update_batch('yourtableName', $data, 'code'); // 'code' is where keyReplace yourtableName with your original table name and code is being used for where key, so you don't need to use $this->db->where('code',$code).
Reference: CodeIgniter.