Forms & Posting - Multiple Data - php

Question

So I was looking at some other posts on this site and came across the code below (EDIT of my code) which works perfectly apart from when I submit I get an error code of: Notice: Undefined index: id in /customers/0/2/e/richardbrown.name/httpd.www/debt/payment_process.php on line 17 for each result.
<form method="post" action="payment_process.php">
<table border="0">';
$stmt = $db->query("SELECT * FROM debt_accounts LEFT JOIN debt_companies ON accounts_company=companies_id WHERE accounts_amount > 0 ORDER BY accounts_company ASC");
while($row = $stmt->fetch(PDO::FETCH_ASSOC)){
echo'<tr>
<td width="200" align="left"><input type="text" name="payment[][id]" value="'.$row['accounts_id'].'" /></td>
<td width="100" align="right"><input type="text" name="payment[][amount]" value="25.00" /></td>
</tr>';
}
echo'</table><br /> <br /><input type="submit" /></form>
if ( isset( $_POST['payment'] ) )
{
echo '<table>';
foreach ( $_POST['payment'] as $diam )
{
echo '<tr>';
echo ' <td>', $diam['id'], '</td>';
echo ' <td>', $diam['amount'], '</td>';
echo '</tr>';
}
echo '</table>';
}

Answer 1

Change this line from your form element:
name="payment_amount"
to be an array:
name="payment_amount[]"
Then, modify your foreach to read as:
foreach ($_POST['payment_amount'] as $value) {
echo $value . "<br>";
}
You were using the wrong POST array => name="payment_id[]"
To add them all up, should you want to do that, use:
foreach ($_POST['payment_amount'] as $value) {
echo $value . "<br>";
$total += $value;
}
echo $total;
or
$total = array_sum($_POST['payment_amount']);

Answer 2

your solution is :
name="payment_id[]" in your form
and server side (payment_process.php)
you use a foreach loop with the $_POST['payment_id'][].