What are the best practices for preventing the resubmission of POST data in PHP forms to avoid F5 issues?

To prevent the resubmission of POST data in PHP forms and avoid F5 issues, one common approach is to use the Post/Redirect/Get (PRG) pattern. This involves processing the form submission, then redirecting to a different page using a GET request. This way, if the user refreshes the page, they will only be refreshing the GET request, not resubmitting the POST data. 

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

    // Redirect to a different page using a GET request
    header("Location: success.php");
    exit;
}

Keywords

POST data resubmission PHP forms F5 prevention

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