content widget space

//widget space direct after content//
//example sidebar code//
register_sidebar(array(
'name'         => 'Content Widget Area',
'id'            => 'content-widget',
'description'   => 'a widget area direct after the content',
'before_widget' => '<li class="content-widget" id="%1$s">',
'after_widget'  => '</li>',
'before_title'  => '<h2>',
'after_title'   => '</h2>'    ));

add_filter('the_content','after_content_widget_space',20); //adjust the number for priority

function after_content_widget_space( $content ) {
$sidebar = '';
    ob_start();
        if ( is_single() && is_active_sidebar( 'content-widget' ) ) :
        $sidebar = '<ul class="content-widget-space">';
        if ( !dynamic_sidebar( 'content-widget' ) ) : endif;
        $sidebar .= ob_get_contents();
        $sidebar .= '</ul>';
        endif;
    ob_end_clean();
return $content . $sidebar;
}