1st level sub menu
<ul class="sub-menu-1">
2nd level sub menu
<ul class="sub-menu-2">
<?php class Custom_Walker_Nav_Menu extends Walker_Nav_Menu { function start_lvl(&$output, $depth = 0, $args = array()) { $indent = str_repeat("\t", $depth); $submenu_class = 'sub-menu-' . ($depth + 1); $output .= "\n$indent<ul class=\"$submenu_class\">\n"; } } wp_nav_menu(array( 'theme_location' => 'desktop_menu', 'menu_class' => 'desktop-menu', 'walker' => new Custom_Walker_Nav_Menu(), )); <
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