In what scenarios would it be advisable to start over and rewrite a PHP form submission script rather than troubleshooting extensively?

If the PHP form submission script is overly complex, poorly structured, or contains outdated code that is difficult to troubleshoot, it may be advisable to start over and rewrite the script from scratch. This approach can help improve code readability, maintainability, and overall performance. Additionally, starting fresh allows for the implementation of best practices and modern techniques that may not have been present in the original script.

<?php

// New PHP form submission script
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process form data here
    $name = $_POST["name"];
    $email = $_POST["email"];
    
    // Validate and sanitize input data
    $name = filter_var($name, FILTER_SANITIZE_STRING);
    $email = filter_var($email, FILTER_SANITIZE_EMAIL);
    
    // Perform necessary actions with the form data
    // For example, save to a database or send an email
    
    // Redirect to a thank you page or display a success message
    header("Location: thank_you.php");
    exit();
}

?>