register-tertiary-nav.php

<?php

add_action( 'after_setup_theme', 'prefix_add_tertiary_menu_support', 0 );
/**
 * Register the tertiary menu locations without overriding any other child theme settings.
 *
 * @return null Returns early if no Genesis menus are supported.
 */
function prefix_add_tertiary_menu_support() {
	$menus = get_theme_support( 'genesis-menus' );
	$tertiary = array(
		'tertiary' => __( 'Tertiary Navigation Menu', 'text-domain' ),
	);
	// If no other menus exist, add the tertiary and end here.
	if ( empty( $menus ) ) {
		add_theme_support( 'genesis-menus', $tertiary );
		return;
	}
	// Merge the tertiary menu in with other theme menu locations.
	$menus = array_merge( $menus[0], $tertiary );
	add_theme_support( 'genesis-menus', $menus );
}

add_action( 'genesis_after_header', 'prefix_do_tertiary_nav' );
/**
 * Echo the "Tertiary Navigation" menu.
 *
 * The preferred option for creating menus is the Custom Menus feature in WordPress. There is also a fallback to using
 * the Genesis wrapper functions for creating a menu of Pages, or a menu of Categories (maintained only for backwards
 * compatibility).
 *
 * Either output can be filtered via `prefix_do_tertiary_nav`.
 *
 * @since 1.0.0
 *
 * @uses genesis_nav_menu_supported() Checks for support of specific nav menu.
 * @uses genesis_markup()             Contextual markup.
 * @uses genesis_html5()              Check for HTML5 support.
 * @uses genesis_structural_wrap()    Adds optional internal wrap divs.
 */
function prefix_do_tertiary_nav() {

	//* Do nothing if menu not supported
	if ( ! genesis_nav_menu_supported( 'tertiary' ) || ! has_nav_menu( 'tertiary' ) ) {
		return;
	}

	$class = 'menu genesis-nav-menu menu-tertiary';
	if ( genesis_superfish_enabled() ) {
		$class .= ' js-superfish';
	}

	$args = array(
		'theme_location' => 'tertiary',
		'container'      => '',
		'menu_class'     => $class,
		'echo'           => 0,
	);

	// If Using Genesis 2.1+ output the genesis_nav_menu and end here.
	if ( function_exists( 'genesis_nav_menu' ) ) {
		genesis_nav_menu( $args);
		return;
	}

	$nav = wp_nav_menu( $args );

	//* Do nothing if there is nothing to show
	if ( ! $nav ) {
		return;
	}

	$nav_markup_open = genesis_markup( array(
		'html5'   => '<nav %s>',
		'xhtml'   => '<div id="nav">',
		'context' => 'nav-tertiary',
		'echo'    => false,
	) );
	$nav_markup_open .= genesis_structural_wrap( 'menu-tertiary', 'open', 0 );

	$nav_markup_close  = genesis_structural_wrap( 'menu-tertiary', 'close', 0 );
	$nav_markup_close .= genesis_html5() ? '</nav>' : '</div>';

	$nav_output = $nav_markup_open . $nav . $nav_markup_close;

	echo apply_filters( 'prefix_do_tertiary_nav', $nav_output, $nav, $args );

}