How to Prevent Form Resubmission After Page Refresh in PHP?

Prevent Resubmitting Forms after Page Refresh

When working with PHP pages that contain insert functions, avoiding form resubmission upon page refresh is a crucial consideration to ensure data integrity. Besides creating separate PHP files for form handling, there's an effective method called the Post-Redirect-Get (PRG) Pattern.

Post-Redirect-Get Pattern

The PRG Pattern involves a five-step process:

1. Accept a Post request: Handle the form submission and process the data.
2. Process the data: Perform any necessary data validation and manipulation.
3. Issue a redirect response: Redirect the user to a different page or the same page with a new query string. This prevents resubmission of the form.
4. Accept a Get request: The redirected page will receive a normal Get request.
5. Issue a 200 response: Display the page with no form data or any necessary information based on the query string from the redirect.

Additional Considerations

For displaying data submitted with the post, you can include a unique identifier, such as a row ID, in the query string of the redirect URL. This allows you to retrieve the submitted data for display without resubmitting the form.

By implementing the PRG Pattern, you can effectively prevent accidental form resubmissions caused by page refreshes, ensuring data accuracy and improving user experience.

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