register_sidebar
if ( ! function_exists( 'themename_sidebar' ) ) {
// Register Sidebar
function themename_sidebar() {
$args = array(
'id' => 'sidebar-id',
'name' => __( 'Sidebar Name', 'themename' ),
'description' => __( 'Sidebar description', 'themename' ),
'before_title' => '<h2 class="widget-title">',
'after_title' => '</h2>',
'before_widget' => '<aside id="%1$s" class="widget %2$s">',
'after_widget' => '</aside>',
);
register_sidebar( $args );
}
// Hook into the 'widgets_init' action
add_action( 'widgets_init', 'themename_sidebar' );
}