I extended Walker_Nav_Menu class as below

class YPE_custom_navwalker extends Walker_Nav_Menu{}

I want use the get_number_of_root_elements( $elements ) function that place in to Walker class within my new class YPE_custom_navwalker

i want use that function for showing the number of root elements within start_el function i used this code below but don't work

echo $args->walker->get_number_of_root_elements($elements);
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I'm not sure if this is what you're after. You can use $this to reference the current walker instance.

class YPE_custom_navwalker extends Walker_Nav_Menu {
    public function start_lvl(&$output, $depth=0, $args=array()) {

        $items = wp_get_nav_menu_items( $args->menu->term_id );
        echo $this->get_number_of_root_elements( $items );

        parent::start_lvl(&$output, $depth,$args);
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