controller

 public function saveApprovals_post()
    {
        $param = file_get_contents('php://input');
        $param = json_decode($param);
        $msg = $app = $reason = array();
        $app = array_map(function($str){ if(substr($str->name, 0, 3) == 'app' || substr($str->name, 0, 3) == 'rej') return $str; }, $param);
        $app = array_values(array_filter($app, function($val){ return $val !== null; }));
        $reason = array_map(function($str){ if(substr($str->name, 0, 6) == 'reason') return $str; }, $param);
        $reason = array_values(array_filter($reason, function($val){ return $val !== null; }));
        for ($i=0; $i < count($app) ; $i++) {
            if ($app[$i]->value != '') {
                $gettime = date('Y-m-d H:i:s');
                if ($app[$i]->value == 'Approved') {
                    $data = [
                        'receive_status'    => '1',
                        'receive_user_id'   => $this->data['user']['userid'],
                        'receive_time'      => $gettime,
                        'updated_at'        => $gettime
                    ];
                }elseif ($app[$i]->value == 'Rejected') {
                    for ($k=0; $k < count($reason) ; $k++) {
                        if ($reason[$i]->value != '') {
                            $data = [
                                'reject'            => '1',
                                'reject_user_id'    => $this->data['user']['userid'],
                                'reason_reject'     => $reason[$i]->value,
                                'reject_time'       => $gettime,
                                'updated_at'        => $gettime
                            ];
                        }
                    }
                }

                $idShipmentNumber = explode('-', $app[$i]->name)[1];
                $IdRlspGet = $this->db->select('ms_remote_lsp_shipment.id as shipment_id, ms_remote_lsp_shipment.shipment_number,remote_lsp.id,remote_lsp.vendor_id,remote_lsp.ms_sparepart_id,remote_lsp.region_id,remote_lsp.dop_id,remote_lsp.ne_id')->join('ms_remote_lsp_shipment','ms_remote_lsp_shipment.id = remote_lsp.remote_lsp_shipment_id')->where('remote_lsp.id',$idShipmentNumber)->get('remote_lsp')->row();
                $id = explode('-', $app[$i]->name)[1];

                $this->db->reset_query();
                if ($this->db->where('id',$id)->update('remote_lsp',$data)) {
                    $msg[] = array('msg' => 'success', 'msg_value' => 'Success! Request '.explode('-', $app[$i]->name)[1].' Approved Or Rejected!');
                    // set attachment
                        // exit;

                    // end set attachment
                }else{
                    $msg[] = array('msg' => 'success', 'msg_value' => 'Failed! Request '.explode('-', $app[$i]->name)[1].' Approved Or Rejected!');
                }
            }
        }
        // insert attachment
        $getVendor = $this->db->select('vendor_name,phone,email')->where('ms_vendor_id',$IdRlspGet->vendor_id)->get('ms_vendor')->row();
        $attachment = $this->setAttachmentVendor($idShipmentNumber,$IdRlspGet,$gettime,$getVendor);
        $this->db->insert('mail_remote_lsp',$attachment);
        // end insert attachment
        $this->db->reset_query();
        // insert attachment two
        $attachtw = $this->setAttachmentApr($idShipmentNumber,$IdRlspGet,$gettime,$getVendor);
        $this->db->insert('mail_remote_lsp',$attachtw);
        // end insert attachment two

        echo json_encode($msg);
    }