How can sessions be utilized to prevent form fields from being cleared after previewing a form in PHP?

When previewing a form in PHP, the issue arises where form fields are cleared when the page is refreshed. To prevent this, we can utilize sessions to store the form data temporarily until the form is submitted. By storing the form data in sessions, we can repopulate the form fields with the previously entered values after previewing the form. 

<?php
session_start();

// Check if form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Store form data in session
    $_SESSION['form_data'] = $_POST;
    // Redirect to preview page
    header("Location: preview_form.php");
    exit();
}

// Check if form data is stored in session
if (isset($_SESSION['form_data'])) {
    $form_data = $_SESSION['form_data'];
    // Populate form fields with stored data
    // Example: <input type="text" name="name" value="<?php echo $form_data['name']; ?>">
}
?>

Keywords

PHP sessions form fields preview data persistence

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