Register sidebar in wordpress.

Register sidebar in wordpress.

add_action( 'widgets_init', 'theme_slug_widgets_init' );
function theme_slug_widgets_init() {
    register_sidebar( array(
        'name' => __( 'Main Sidebar', 'theme-slug' ),
        'id' => 'sidebar-1',
        'description' => __( 'Widgets in this area will be shown on all posts and pages.', 'theme-slug' ),
        'before_widget' => '<li id="%1$s" class="widget %2$s">',
'after_widget'  => '</li>',
'before_title'  => '<h2 class="widgettitle">',
'after_title'   => '</h2>',
    ) );
}