Walker под фреймворк UIKit 3

WPR_Menu_Walker.php

<?php
class WPR_Menu_Walker extends Walker_Nav_Menu {
	public function start_lvl( &$output, $depth = 0, $args = array() ) {
		if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) {
			$t = '';
			$n = '';
		} else {
			$t = "\t";
			$n = "\n";
		}
		$indent = str_repeat( $t, $depth );
		// Default class.
		$classes  = array( 'sub-menu', 'uk-nav-sub', 'uk-list-divider' );
		$dropdown = $depth >= 1 ? '' : "<div class='uk-navbar-dropdown  uk-drop'>";
		//$dropdown_class = $depth >= 1 ? 'uk-nav-default'  : '';
		$class_names = join( ' ', apply_filters( 'nav_menu_submenu_css_class', $classes, $args, $depth ) );
		$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
		$output      .= "$dropdown{$n}{$indent}<ul $class_names>{$n}";
	}
	
	public function end_lvl( &$output, $depth = 0, $args = array() ) {
		if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) {
			$t = '';
			$n = '';
		} else {
			$t = "\t";
			$n = "\n";
		}
		$dropdown = $depth >= 1 ? '' : '</div>';
		$indent   = str_repeat( $t, $depth );
		$output   .= "$indent</ul>{$n}$dropdown";
	}
	
	public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
		if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) {
			$t = '';
			$n = '';
		} else {
			$t = "\t";
			$n = "\n";
		}
		$indent    = ( $depth ) ? str_repeat( $t, $depth ) : '';
		$classes   = empty( $item->classes ) ? array() : (array) $item->classes;
		$classes[] = 'menu-item-' . $item->ID;
		$args = apply_filters( 'nav_menu_item_args', $args, $item, $depth );
		$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args, $depth ) );
		$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
		$id              = apply_filters( 'nav_menu_item_id', 'menu-item-' . $item->ID, $item, $args, $depth );
		$id              = $id ? ' id="' . esc_attr( $id ) . '"' : '';
		$output          .= $indent . '<li' . $id . $class_names . '>';
		$atts            = array();
		$atts['title']   = ! empty( $item->attr_title ) ? $item->attr_title : '';
		$atts['target']  = ! empty( $item->target ) ? $item->target : '';
		$atts['rel']     = ! empty( $item->xfn ) ? $item->xfn : '';
		$atts['href']    = ! empty( $item->url ) ? $item->url : '';
		//$atts['uk-icon'] = $depth == 0 && $args->walker->has_children == 1 ? 'icon: chevron-down' : '';
		$atts       = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args, $depth );
		$attributes = '';
		foreach ( $atts as $attr => $value ) {
			if ( ! empty( $value ) ) {
				$value      = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
				$attributes .= ' ' . $attr . '="' . $value . '"';
			}
		}
		/** This filter is documented in wp-includes/post-template.php */
		$title = apply_filters( 'the_title', $item->title, $item->ID );
		$title       = apply_filters( 'nav_menu_item_title', $title, $item, $args, $depth );
		$item_output = $args->before;
		$item_output .= '<a' . $attributes . '>';
		$item_output .= $args->link_before . $title . $args->link_after;
		$item_output .= '</a>';
		$item_output .= $args->after;
		//get_pr($args->walker->has_children, false);
		$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
	}
	
}