Show All Children of WordPress Menu

Question

The code below shows the active sub menu of the Main Menu. It's nearly perfect, however, I need it to show ALL subitems of these sub items, and their children. AKA unlimited depth. Thanks in advance!

To further clarify here is an example:

WP - Main Menu

1. Home
2. About
3. News (Active Menu Item)
   • Press
   • Social
     • Facebook
     • Twitter
   • Speeches
4. Contact

With the code currently, if I'm on News, Press, Social, Facebook, or Twitter Page, it shows the side menu:

1. Press
2. Social
3. Speeches

That is what I want, except that on all of those pages, "Social"'s two children (Facebook and Twitter should appear under social as well.

class Selective_Walker extends Walker_Nav_Menu
    {
        function walk( $elements, $max_depth) {

            $args = array_slice(func_get_args(), 2);
            $output = '';

            if ($max_depth < -1) //invalid parameter
                return $output;

            if (empty($elements)) //nothing to walk
                return $output;

            $id_field = $this->db_fields['id'];
            $parent_field = $this->db_fields['parent'];

            // flat display
            if ( -1 == $max_depth ) {
                $empty_array = array();
                foreach ( $elements as $e )
                    $this->display_element( $e, $empty_array, 1, 0, $args, $output );
                return $output;
            }

            /*
             * need to display in hierarchical order
             * separate elements into two buckets: top level and children elements
             * children_elements is two dimensional array, eg.
             * children_elements[10][] contains all sub-elements whose parent is 10.
             */
            $top_level_elements = array();
            $children_elements  = array();
            foreach ( $elements as $e) {
                if ( 0 == $e->$parent_field )
                    $top_level_elements[] = $e;
                else
                    $children_elements[ $e->$parent_field ][] = $e;
            }

            /*
             * when none of the elements is top level
             * assume the first one must be root of the sub elements
             */
            if ( empty($top_level_elements) ) {

                $first = array_slice( $elements, 0, 1 );
                $root = $first[0];

                $top_level_elements = array();
                $children_elements  = array();
                foreach ( $elements as $e) {
                    if ( $root->$parent_field == $e->$parent_field )
                        $top_level_elements[] = $e;
                    else
                        $children_elements[ $e->$parent_field ][] = $e;
                }
            }

            $current_element_markers = array( 'current-menu-item', 'current-menu-parent', 'current-menu-ancestor' );  //added by continent7
            foreach ( $top_level_elements as $e ){  //changed by continent7
                // descend only on current tree
                $descend_test = array_intersect( $current_element_markers, $e->classes );
                if ( !empty( $descend_test ) ) 
                    $this->display_element( $e, $children_elements, 0, 0, $args, $output );
            }

            /*
             * if we are displaying all levels, and remaining children_elements is not empty,
             * then we got orphans, which should be displayed regardless
             */
             /* removed by continent7
            if ( ( $max_depth == 0 ) && count( $children_elements ) > 0 ) {
                $empty_array = array();
                foreach ( $children_elements as $orphans )
                    foreach( $orphans as $op )
                        $this->display_element( $op, $empty_array, 1, 0, $args, $output );
             }
            */

/*added by alpguneysel  */
                $pos = strpos($output, '<a');
            $pos2 = strpos($output, 'a>');
            $topper= substr($output, 0, $pos).substr($output, $pos2+2);
            $pos3 = strpos($topper, '>');
            $lasst=substr($topper, $pos3+1);
            $submenu= substr($lasst, 0, -6);

        return $submenu;
        }
    }

Answer 1

After no solution from the community :-/ and days of reviewing it over and over I determined I simply had to change a 2 to a 0 for unlimited depth, and now it works perfectly!