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wpmu_list_pages() {
 
	$args = array(
		'depth' => 2
	);

	wp_list_pages( $args );

}

wp_list_pages( $args );

wpmu_list_pages() {
 
	$args = array(
		'depth' => 2
	);

}

<?php wp_nav_menu( array(
		'theme_location' => 'top',
		'menu_id'        => 'top-menu',
	) ); ?>

/*
Theme Name:     WPMU DEV Automated Navigation Menus
Theme URI:      https://github.com/rachelmccollin/wpmudev-automated-menus
Description:    Theme to support WPMU DEV post on automating navigation and section menus. Child theme for the Twenty Seventeen theme.
Author:         Rachel McCollin
Author URI:     http://rachelmccollin.co.uk/
Template:       twentyseventeen
Version:        1.0
*/

@import url("../twentyseventeen/style.css");

<?php
/**
 * Plugin Name: WPMU DEV Automated Navigation Menus
 * Plugin URI: https://github.com/rachelmccollin/wpmudev-automated-menus
 * Description: Plugin to accompnay WPMU DEV post on automating navigation and section menus
 * Version: 1.0
 * Author: Rachel McCollin
 * Author URI: http://rachelmccollin.co.uk
 *
 */

<?php 
	
	if ( function_exists( 'wpmu_list_pages' ) ) {
		wpmu_list_pages();
	}
	
	else {
		wp_nav_menu( array(
			'theme_location' => 'top',
			'menu_id'        => 'top-menu',
		) );
	} 
	
	?>

$args = array(
	'depth' => 2,
	'title_li' => '<h3>' . __( 'Menu', 'wpmu' ) . '</h3>',
	'sort_column' => 'menu-order'
);

$args = array(
	'depth' => 2
);