POST data becomes NULL after form submit (CodeIgniter) - php

Question

I have a problem on getting post data after submitting a form. What I'm trying to do is that, when the user clicks the submit button, input values stored in the hidden fields will be assigned to a variable into another controller class. However, when I tried to print out the form value, its always giving me NULL
This is my code:
Controller
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
}
View
...
<?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(); ?>
Is there something wrong with the code? Any help would be appreciated

Answer 1

In your form tag, if you do not specify the method it will be get method.
<form action="Order_Controller/updateOrder" method="post">
...
</form>

Answer 2

You are missing the method in your form tag.
form_open('order_Controller/updateOrder', array('method'=>'post'));
Note:
Please use model for database related queries.
Pass the query result to the controller and then to the view.
You can add your validation in configuration. To handle all validation at one place.

Answer 3

// This Will outputs always null
var_dump($this->input->post);
// To Get Value Array from codeigniter input class
var_dump($this->input->post());
method will return the values in $_POST variable
because you are accessing uninitialized property of a object
The correct way to get post variable from codeigniter input class is
$this->input->post() is equivalent to $_POST;
$this->input->post('data') is equivalent to $_POST['data']