Php voucher system - update codes - php

Question

I have this voucher system, that works very well. I ust want to change the code to extract vouchers code and value from database.
cart.php Voucher code is :
$cartTotal = 100;
if (isset($_POST['disCode'])) {
$arr = file('flatfile1.txt');
$disCode = strtoupper(trim($_POST['disCode']));
$found = false;
- List item
foreach($arr as $str)
{
// Skip empty or invalid lines (assuming your file flatfile1.txt has blank lines).
if (strpos($str, '|') === false)
continue;
list($code,$amount,$valz) = explode('|',$str);
if ($disCode === trim($code))
{
// Code found.
$cartTotal = round($cartTotal/$amount );
$found = true;
break;
}
}
if (!$found)
$mesaj_eroare= "sorry,voucher code: $disCode is not good";
else
$mesaj_aplicare_voucher = "succes message here.";
}
And flatfile1.txt has :
TEST20% | 1.20 | 20%
TEST10% | 1.1 | 10%
TEST05% | 1.05 | 5%
test20% is the voucher code, 1.20 is the value of code, and 20% is for a custom message to apear to the user.
I tried to change flatfile1.txt to flatfile1.php where i retrive values from database.
Database have this format
TEST20% | 1.20 | 20%
TEST10% | 1.1 | 10%
TEST05% | 1.05 | 5%
And values are recognised in flatfile1.php but when i tried to apply them into cart.php to the voucher system are not recognised.
Need a solution to replace flatfile1.txt to flatfile1.php for automatization of vouchers.