WordPress在导航里面添加自定义项目

/**
* Add a custom link to the end of a specific menu that uses the wp_nav_menu() function
*/
add_filter( 'wp_nav_menu_items', 'so_add_admin_link', 10, 2 );
function so_add_admin_link( $items, $args ) {
    if( $args->theme_location == 'footer_menu' ) {
        // change 'footer_menu' to the menu in the theme_location of your choice
        $items = $items . '<li><a title="' . esc_attr( __( 'Admin', 'textdomain' ) ) . '" href="' . esc_url( admin_url() ) . '">' . esc_attr( __( 'Admin', 'textdomain' ) ) . '</a></li>';
    }
    return $items;
}