Is there a correct way of using Flashdata? The doc seems confusing.

Personally I'm using it like this.

PHP Code:

// Helper function
if ( ! function_exists('get_flashdata'))
{
    function get_flashdata($name = NULL, $type = 'success', $destroy = TRUE)
    {
        if( ! empty($name) && isset($_SESSION[$name]) )
        {
            $tmp = $_SESSION[$name];

            if( ! in_array($type, ['danger','info','warning','success']) )
                $type = 'success';
            if( $destroy )
                unset($_SESSION[$name]);

            return '<div class="alert alert-' . html_escape($type) . ' no-print">' . html_escape($tmp) . '</div>';
        }
    }
} 


Setting

PHP Code:

$_SESSION['flashdata'] = 'Whatever'; 


Getting

PHP Code:

<?= get_flashdata('flashdata'); ?>

Thank you. It's a nice approach.

So, is the documentation outdated?