How can I get the value from another form - php

Question

now i'm trying to get the value from another form. But i don't know how to make it.
This is my first form:
and this is method, when we click submit in the the form1, the page will redirect to this method.
public function input_data_inserted()
{
$id_data_inserted = $this->input->post('id_data_inserted');
$date = $this->input->post('date');
$id_data = $this->input->post('id_data');
$amount= $this->input->post('amount');
$id_room = $this->input->post('id_room');
$passed = FALSE;
$checkIdData = $this->modelku->cek_idData()->result_array();
$checkIdRoom = $this->modelku->cek_idRoom()->result_array();
foreach ($cekIdData as $cID)
{
foreach ($cekIdRoom as $cIR)
{
if ($id_data == $cID['id_data'] && $id_room == $cIR['id_room'])
{
$data = array
(
'id_data_inserted' => $id_data_inserted,
'date' => $date,
'id_data' => $cID['id_data'],
'amount' => $amount,
'id_room' => $cIR['id_room'],
);
$this->modelku->input_data($data, 'table_data_inserted');
$data['table_data_inserted'] = $this->modelku->show_data('table_data_inserted')->result();
$this->modelku->increase_value($amount, $id_data);
//redirect to second form
redirect('admin/Data/data\view_detail_data');
$passed = TRUE;
break;
}
}
}
if(!$passed)
{
echo "ERORR";
}
}
And this is my second form:
Method for second form:
public function input_detail_barang()
{
$id_data = $this->input->post('id_data');
$no_inv = $this->input->post('no_inv');
$condition = $this->input->post('condition');
$data = array
(
'id_data' => $id_data,
'no_inv' => $no_inv,
'condition' => $condition
);
//I need amount from first form, because i will use it. How can i do?
}
Any Solution? Thx

Answer 1

After this line you can save it to session:
$data = array (
'id_data_inserted' => $id_data_inserted,
'date' => $date,
'id_data' => $cID['id_data'],
'amount' => $amount,
'id_room' => $cIR['id_room'], // You missed single quote here
);
$this->load->library('session');
$this->session->set_userdata("Firstformdata",$data);
And for show this data add this line:
$this->session->userdata("Firstformdata");