In the provided code, why are variables like email, name, and submit not defined when the form is submitted? How can this issue be addressed?

The issue arises because the variables like email, name, and submit are not defined within the PHP code that processes the form submission. To address this issue, these variables need to be assigned values from the form input fields using the $_POST superglobal array. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $email = $_POST['email'];
    $name = $_POST['name'];
    $submit = $_POST['submit'];

    // Process the form data here
}
?>

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