Wordpress functions.php: sidebar

function register_sidebars() {
  $sidebars = array('Sidebar', 'Footer','YouTube', 'Wydarzenia');
  foreach($sidebars as $sidebar) {
    register_sidebar(
      array(
        'id'            => 'blabla-' . sanitize_title($sidebar),
        'name'          => __($sidebar, 'sw'),
        'description'   => __($sidebar, 'sw'),
        'before_widget' => '<article id="%1$s"><div>',
        'after_widget'  => '</div></article>',
        'before_title'  => '<h3>',
        'after_title'   => '</h3>'
      )
    );
  }
}
add_action('widgets_init', 'register_sidebars');