[WP] - Add featured thumbnail to admin post / page columns

gistfile1.aw

// http://wpsnipp.com/index.php/functions-php/updated-add-featured-thumbnail-to-admin-post-page-columns/

if (function_exists( 'add_theme_support' )){
    add_filter('manage_posts_columns', 'posts_columns', 5);
    add_action('manage_posts_custom_column', 'posts_custom_columns', 5, 2);
    add_filter('manage_pages_columns', 'posts_columns', 5);
    add_action('manage_pages_custom_column', 'posts_custom_columns', 5, 2);
}
function posts_columns($defaults){
    $defaults['wps_post_thumbs'] = __('Thumbs');
    return $defaults;
}
function posts_custom_columns($column_name, $id){
	if($column_name === 'wps_post_thumbs'){
        echo the_post_thumbnail( array(125,80) );
    }
}