使用条件传递值的未识别索引

Question

I have a problem,

if($_POST['carrier'] == 'LBC') {
    $_POST['payment'] =='BPI';
}
else if($_POST['carrier'] == 'PickUp') {
    $_POST['payment'] == 'PickUp';
}

if (isset($_POST['order'])) {
    $_SESSION['carrier'] = $_POST['carrier'];
    $_SESSION['payment'] = $_POST['payment'];
}

my $_POST['payment'] is causing an unidentified index problem but my carrier is not, maybe because i used a form using the carrier on the previous page.

how do i fix this problem? because i need to pass the value for the payment. only the carrier is passed from the previous form, but here in this page, i need to pass a value to the $_POST or at least in the $_SESSION but it does not work for me.

i dont know what's wrong.

Answer 1

No you must use the $_POST that way, its only going to be set on form submission.

$payment = null;
if($_POST['carrier'] == 'LBC'){
    $payment = 'BPI';
}

else if($_POST['carrier'] == 'PickUp'){
    $payment = 'PickUp';
          // ^ assignment operator (=) not (==) equality
}

if (isset($_POST['order'])){
    $_SESSION['carrier'] = $_POST['carrier'];
    $_SESSION['payment'] = $payment;
}