Codeigniter adding data to database and then process it - php

Question

I am using codeigniter to built a type of online shop.
I want to create a process order function in order to verify the details of the order the clients puts in.
I am stuck though because on the last page i have the data to submit and when i click i go to main/process_order where i insert the data in the table and then use curl to comunicate with another server.
My question is: when i hit submit and then stop on the process_order page if i reload it 1000 times, the table will be filled with the same 1000 lines, so this can be a security issue. Also if i make a function to add the data to db and then redirect to process_order it will be another issue because i still need my data that was posted.
What's the best way to solve this. I hope i made it as clear as i can.
Code:
$data=array(
'userid' => $userid,
'email' => $email_data,
'phone' => $this->input->post('phone'),
'discount' => $this->input->post('discount'),
'price' => $this->input->post('price'),
'final_price' => $this->input->post('final_price'),
'client_data' => $this->input->post('client_info'),
'client_ip' => $this->input->post('client_ip'),
'time' => $date
);
$this->db->insert('orders_temp', $data);

Answer 1

Maybe something like this can help. Do a check on the userid and the time before you insert the data. You would need make sure to do a search on database fields that are unique (unless the time field is the full time)
$data=array(
'userid' => $userid,
'email' => $email_data,
'phone' => $this->input->post('phone'),
'discount' => $this->input->post('discount'),
'price' => $this->input->post('price'),
'final_price' => $this->input->post('final_price'),
'client_data' => $this->input->post('client_info'),
'client_ip' => $this->input->post('client_ip'),
'time' => $date
);
if (<!--CONDITIONAL STATEMENT-->)
{
$this->db->insert('orders_temp', $data);
}