How can the "Data Resend" message be avoided when navigating back and forth on a website with multiple POST forms in PHP?

To avoid the "Data Resend" message when navigating back and forth on a website with multiple POST forms in PHP, you can use the Post/Redirect/Get (PRG) pattern. This involves processing the form data, then redirecting to a different URL using the header() function to prevent resubmission of the form data when the user refreshes the page. 

<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    // Process form data here

    // Redirect to a different URL to prevent form resubmission
    header("Location: success.php");
    exit;
}
?>

Keywords

PHP POST forms session management form resubmission CSRF protection

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