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');