我在提交表单后获取发布数据时遇到了问题。我尝试做的是，当用户单击提交按钮时，存储在隐藏字段中的输入值将被赋给另一个控制器类中的变量。但是，当我尝试打印表单值时，它总是给我NULL
这是我的代码：
主计长

public function updateOrder(){
    $this->form_validation->set_rules('delivery_status_id', 'Delivery Status', 'xss_clean');
    $this->form_validation->set_rules('remarks', 'Remarks', 'xss_clean');
    $this->form_validation->set_rules('total_amt', 'Total Amount', 'xss_clean');

    $data = array('remarks' => $this->input->post('remarks'),
                  'delivery_status_id' => $this->input->post('delivery_status_id'),
                  'total_amt' => $this->input->post('total_amt'));

    if ($data['delivery_status_id'] == $getDeliveryStatusIdDelivered->row('id'))
    {
        $this->db->select('*');
        $this->db->from('user_has_penalty');
        $this->db->where("user_id =" . $this->session->userdata['id']);

        $query = $this->db->get();

        foreach ($query->result() as $row) 
        {
            $this->db->delete('user_has_penalty', array('user_id' => $this->session->userdata['id']));
            $this->db->delete('penalty', array('id' => $row->penalty_id));
        }
    }else if($data['delivery_status_id'] == $getDeliveryStatusIdCancelled->row('id'))
    {
        $penalty_amt = $data['total_amt'] / 2;
        $data = array('amount' => $penalty_amt);
        $this->penalty->insert($data);
        $penalty_id = $this->db->insert_id();

        //var_dump($penalty_id);
    }

    var_dump($this->input->post); // Outputs NULL
}

检视

...

<?php
    $name_c = 'Cancelled';
    $query = $this->DeliveryStatus->getDeliveryStatusByName($name_c);

    echo form_open('Order_Controller/updateOrder');
?>
    <input type="hidden" name="delivery_status_id" value="<?php echo $query->row('id'); ?>"/>
    <button type="submit" class="btn btn-danger">YES</button>
    <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
<?php echo form_close(); ?>

代码有什么问题吗？如果有任何帮助，我们将不胜感激