How Can I Implement a Simple PHP Post-Redirect-Get (PRG) Pattern?

Simple PHP Post-Redirect-Get (PRG) Code Example

Implementing Post-Redirect-Get (PRG) in PHP can be straightforward. Here's a simplified example:

form.php

<form method="POST" action="validate.php">
   <!-- form elements -->
</form>

validate.php

<?php
if ($_POST) {
    // Validate input and execute code
    if (/* valid input */) {
        // Redirect to itself using REQUEST_URI
        header("Location: {$_SERVER['REQUEST_URI']}", true, 303);
        exit();
    }
}

submitted.php or invalid_input.php

<?php
echo $_SESSION['form_html'];

This script generates the form HTML stored in the session and displays it in case the user accesses the URL directly.

Benefits:

• Protection against form resubmission and browser back button issues
• Simple and straightforward implementation

Your approach to reinventing the wheel is not unreasonable. However, using the built-in HTTP status codes and header functions can help ensure reliable behavior and interoperability with other applications.

The above is the detailed content of How Can I Implement a Simple PHP Post-Redirect-Get (PRG) Pattern?. For more information, please follow other related articles on the PHP Chinese website!