add custom col for media page

gistfile1.aw

add_filter('manage_media_columns', array ($this,'my_media_col'));
add_action('manage_media_custom_column', array ($this,'handle_my_media_col'), 10, 2);

function my_media_col($cols)
{
    $cols['my_col'] = 'Footer';
    return $cols;
}


function handle_my_media_col($name, $id)
{
    if ($name !== 'my_col')
        return false;
    $in_footer = get_option('in_footer', array());
?>
<input type="checkbox" name="in_footer[]" value="<?php echo $id; ?>" <?php checked(in_array($id, $in_footer)); ?> />
<?php
}

// save
function save_my_col()
{
    if (!isset($_POST['in_footer']))
        return false;

    $in_footer = $_POST['in_footer'];
    if (is_array($in_footer))
        $in_footer = array_map('absint', $in_footer); // sanitize
    else
        $in_footer = array();

    $in_footer = array_merge(get_option('in_footer', array()), $in_footer);
    $in_footer = array_unique(array_filter($in_footer));
    update_option('in_footer', $in_footer);
}
add_action('load-upload.php', 'save_my_col');


// use
$query = new WP_Query(array('post__in' => get_option('in_footer', array()) ));

if ($query->have_posts()): while ($query->have_posts()): $query->the_post();
?>

<a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>

<?php endwhile; endif; ?>