add_action( 'widgets_init', 'register_main_sidebar' ); function register_main_sidebar() { $args = array( 'name' => 'Main Sidebar', 'id' => 'main-sidebar', 'description' => 'This sidebar is shown on the right side of posts and pages', 'class' => 'wpdd-main-sidebar', 'before_widget' => '<li id="%1$s" class="widget %2$s">', 'after_widget' => '</li>', 'before_title' => '<h2 class="widgettitle">', 'after_title' => '</h2>' ); register_sidebar( $args ); }