What are best practices for handling form submissions in PHP to ensure users stay on the website after submission?

When handling form submissions in PHP, it's important to use server-side validation to ensure data integrity and security. To keep users on the website after submission, you can redirect them back to the original page or a designated success page. This can be achieved by using header() function to redirect the user after processing the form data.

// Process form submission
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Validate form data
    // Process form data

    // Redirect user back to the original page
    header("Location: ".$_SERVER['PHP_SELF']);
    exit();
}