PHP HTML Form can't read variables posted back on itself - php

Question

I've not done any coding in a while, but needed a quick way to send an email to a few people at a time with using two variables. Should be simple, but I have no idea why this isn't working.
Thanks in advance.
<?php
if(!empty($POST['update']))
{
echo 'it works!';
}
else
{
?>
<h1>Order Confirmation</h1>
<form method="post" action="order-confirmation.php" name="update">
<table>
<tr>
<td>Account Number</td>
<td>Consignment Number</td>
</tr>
<tr>
<td><input type="text" name="accno" value=""/></td>
<td><input type="text" name="conno" value=""/></td>
</tr>
<tr>
<td><input type="submit" name="submit" action="order-confirmation.php"/></td>
</tr>
</table>
</form>
<?php
}
?>

Answer 1

It should be
$_POST
Instead of
$POST
Also, you want it to be $_POST['submit'] instead of update.

Answer 2

You do not have input field called "update".
You must also replace $POST with $_POST and add an <input type="hidden" name="update" value="1" /> to your form.
type="submit" does not need action attribute because you already have defined action in your <form>.

Answer 3

I usually use something like this (anything with // before mean comment, not executable code)
//Request method detect that POST is used not GET which mean the form is submitted
if ($_SERVER['REQUEST_METHOD'] == 'POST) {
// This condition detect that the input with name "submit" is pressed, you can
// add multiple submit buttons and each with different value, then just do
// equality check to specify the actions
if ($_POST['submit']) {
echo 'it works!';
}
}