What is the best practice for saving form data in an existing session without destroying the session in PHP?

When saving form data in an existing session without destroying the session in PHP, the best practice is to store the form data in the $_SESSION superglobal array. This allows the form data to persist across different pages within the same session. 

// Start the session
session_start();

// Check if form data has been submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Store form data in session variables
    $_SESSION['form_data'] = $_POST;
}

// Retrieve form data from session if it exists
if (isset($_SESSION['form_data'])) {
    $form_data = $_SESSION['form_data'];
    // Use the form data as needed
}

Keywords

PHP session form data best practice session preservation

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