functions

register_sidebar( array(
        'name' => __( 'sidebar' ),
        'id' => 'sidebar',
        'description' => __( 'Barra lateral' ),
        'before_widget' => '<li id="%1$s" class="widget-container %2$s">',
        'after_widget' => '</li>',
        'before_title' => '<h4 class="widget-title">',
        'after_title' => '</h4>',
    ) );