Create Menu Link

create_menu_link.php

/**
 * Create menu link.
 */
function demo_create_menu_link($path, $title, $weight) {
  $menu_link = array(
    'menu_name' => 'main-menu',
    'link_path' => $path,
    'link_title' => $title,
    'has_children' => 0,
    'expanded' => 0,
    'weight' => $weight,
  );  
  menu_link_save($menu_link);
  menu_cache_clear_all();
}