Are there any best practices or guidelines to follow when designing a PHP form to prevent resubmission issues?

To prevent resubmission issues when designing a PHP form, one best practice is to use the Post/Redirect/Get (PRG) pattern. This involves processing form submissions, then redirecting to a different page to prevent the form from being resubmitted if the user refreshes the page. Another approach is to generate a unique token for each form submission and validate it to ensure that the form is not being resubmitted. 

// Check if the form has been submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process form data

    // Redirect to a different page to prevent resubmission
    header("Location: success.php");
    exit;
}

Keywords

form design PHP prevent resubmission CSRF token session management

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