How can hidden fields be used in PHP forms to store temporary data for preview functionality, and what are the best practices for implementing this approach?

Hidden fields can be used in PHP forms to store temporary data for preview functionality by passing the data from one form submission to another without displaying it to the user. This approach allows users to preview their form data before final submission. To implement this, you can store the form data in hidden fields on the preview page and then pass it back to the form submission page for final processing. 

// Form submission page
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process form data
    // Store form data in hidden fields for preview
    $name = $_POST['name'];
    $email = $_POST['email'];
}

// Preview page
<form action="submit.php" method="post">
    <input type="hidden" name="name" value="<?php echo $name; ?>">
    <input type="hidden" name="email" value="<?php echo $email; ?>">
    
    <button type="submit">Submit</button>
</form>

Keywords

hidden fields PHP forms temporary data preview functionality implementation approach

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