wp_nav_menu_disabled_check example

// Restores the more descriptive, specific name for use within this method.         $menu_item = $data_object;

        $_nav_menu_placeholder = ( 0 > $_nav_menu_placeholder ) ? (int) $_nav_menu_placeholder - 1 : -1;
        $possible_object_id    = isset( $menu_item->post_type ) && 'nav_menu_item' === $menu_item->post_type ? $menu_item->object_id : $_nav_menu_placeholder;
        $possible_db_id        = ( ! empty( $menu_item->ID ) ) && ( 0 < $possible_object_id ) ? (int) $menu_item->ID : 0;

        $indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';

        $output .= $indent . '<li>';
        $output .= '<label class="menu-item-title">';
        $output .= '<input type="checkbox"' . wp_nav_menu_disabled_check( $nav_menu_selected_id, false ) . ' class="menu-item-checkbox';

        if ( ! empty( $menu_item->front_or_home ) ) {
            $output .= ' add-to-top';
        }

        $output .= '" name="menu-item[' . $possible_object_id . '][menu-item-object-id]" value="' . esc_attr( $menu_item->object_id ) . '" /> ';

        if ( ! empty( $menu_item->label ) ) {
            $title = $menu_item->label;
        } elseif ( isset( $menu_item->post_type ) ) {
            /** This filter is documented in wp-includes/post-template.php */
            

function wp_nav_menu_item_link_meta_box() {
    global $_nav_menu_placeholder, $nav_menu_selected_id;

    $_nav_menu_placeholder = 0 > $_nav_menu_placeholder ? $_nav_menu_placeholder - 1 : -1;

    ?> <div class="customlinkdiv" id="customlinkdiv"> <input type="hidden" value="custom" name="menu-item[<?php echo $_nav_menu_placeholder; ?>][menu-item-type]" /> <p id="menu-item-url-wrap" class="wp-clearfix"> <label class="howto" for="custom-menu-item-url"><?php _e( 'URL' ); ?></label> <input id="custom-menu-item-url" name="menu-item[<?php echo $_nav_menu_placeholder; ?>][menu-item-url]" type="text"<?php wp_nav_menu_disabled_check( $nav_menu_selected_id ); ?> class="code menu-item-textbox form-required" placeholder="https://" /> </p> <p id="menu-item-name-wrap" class="wp-clearfix"> <label class="howto" for="custom-menu-item-name"><?php _e( 'Link Text' ); ?></label> <input id="custom-menu-item-name" name="menu-item[<?php echo $_nav_menu_placeholder; ?>][menu-item-title]" type="text"<?php wp_nav_menu_disabled_check( $nav_menu_selected_id ); ?> class="regular-text menu-item-textbox" /> </p> <p class="button-controls wp-clearfix"> <span class="add-to-menu"> <input id="submit-customlinkdiv" name="add-custom-menu-item" type="submit"