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WP_nav_menu separate submenu output

Use xPath to define which part of the menu do you want to output. By default it outputs menu starting at 2nd level.

Code Snippet:

<?php

/**
 * WP_nav_menu separate submenu output.
 *
 * Optional $args contents:
 *
 * string theme_location - The menu that is desired.  Accepts (matching in order) id, slug, name. Defaults to blank.
 * string xpath - Optional. xPath syntax.
 * string before - Optional. Text before the menu tree.
 * string after - Optional. Text after the menu tree.
 * bool echo - Optional, default is TRUE. Whether to echo the menu or return it.
 *
 * @param array $args Arguments
 * @return String If $echo value is set to FALSE.
 */
function px_the_submenu( $args = array() )
{
 
    $defaults = array(
        'theme_location' => '',
        'xpath' => "./li[contains(@class,'current-menu-item') or contains(@class,'current-menu-ancestor')]/ul",
        'before' => '',
        'after' => '',
        'echo' => true
    );
    $args = wp_parse_args( $args, $defaults );
    $args = (object) $args;
 
    $output = array();
 
    $menu_tree = wp_nav_menu( array( 'theme_location' => $args->theme_location, 'container' => '', 'echo' => false ) );
    $menu_tree_XML = new SimpleXMLElement( $menu_tree );
    $path = $menu_tree_XML->xpath( $args->xpath );
 
    $output[] = $args->before;
 
    if( ! empty( $path ) )
    {
        $output[] = $path[0]->asXML();
    }
 
    $output[] = $args->after;
 
    if( $args->echo )
        echo implode('', $output );
    else
        return implode('', $output );
 
}

?>

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