The Big Four Menus

Child theme friendly navigation menus for functions.php

if ( ! function_exists( 'custom_navigation_menus' ) ) {

// Register Navigation Menus
function custom_navigation_menus() {

	$locations = array(
		'top_menu' => __( 'Top Menu', 'text_domain' ),
		'main_menu' => __( 'Main Menu', 'text_domain' ),
		'sidebar_menu' => __( 'Sidebar Menu', 'text_domain' ),
		'footer_menu' => __( 'Footer Menu', 'text_domain' ),
	);
	register_nav_menus( $locations );

}

// Hook into the 'init' action
add_action( 'init', 'custom_navigation_menus' );

}