[Drupal 7] How to create custom menu programmatically http://rutcreate.com/how-to-create-custom-menu-programmatically

create_custom_menu.php

<?php

$menu = array(
  'menu_name' => 'custom-menu',
  'title' => t('My custom menu'),
  'description' => t('The <em>Custom</em> menu contains links for testing only.'),
);
menu_save($menu);

menu.install

/**
 * Implements hook_install().
 */
function menu_install() {
  $system_menus = menu_list_system_menus();
  $t = get_t();
  $descriptions = array(
    'navigation' => $t('The <em>Navigation</em> menu contains links intended for site visitors. Links are added to the <em>Navigation</em> menu automatically by some modules.'),
    'user-menu' => $t("The <em>User</em> menu contains links related to the user's account, as well as the 'Log out' link."),
    'management' => $t('The <em>Management</em> menu contains links for administrative tasks.'),
    'main-menu' => $t('The <em>Main</em> menu is used on many sites to show the major sections of the site, often in a top navigation bar.'),
  );
  foreach ($system_menus as $menu_name => $title) {
    $menu = array(
      'menu_name' => $menu_name,
      'title' => $t($title),
      'description' => $descriptions[$menu_name],
    );
    menu_save($menu);
  }
}

my_custom_menu.info

name = My Custom Menu
description = Provide custom menu for testing only
core = 7.x

my_custom_menu.install

<?php

/**
 * Implements of hook_install().
 */
function my_custom_menu_install() {
  $t = get_t();
  $menu = array(
    'menu_name' => 'custom-menu',
    'title' => $t('My custom menu'),
    'description' => $t('The <em>Custom</em> menu contains links for testing only.'),
  );
  menu_save($menu);
}