Is it possible to have a HTML SELECT/OPTION value as NULL using PHP?

Question

The following is a snippet from my HTML form which pulls the options from the table rows accordingly.

What I want to do is have the first option value to be NULL so

Answer 1

No, POST/GET values are never null. The best they can be is an empty string, which you can convert to null/'NULL'.

if ($_POST['value'] === '') {
    $_POST['value'] = null; // or 'NULL' for SQL
}