dynamically create wordpress menu

wordpress.menu.php

/**
 * Credit from here: @http://wordpress.stackexchange.com/questions/50168/how-do-i-create-predefined-menus-for-my-theme/50332#50332
 */
function register_my_menus() {

    $menus = array(
        'Main menu' => array(
            'slug' => 'main-menu',
            'menu_items' => array(
                'Home' => site_url(),
                'Search' => site_url('/search/'),
                'Online now' => site_url('online-now'),
                'Video Chat' => site_url('/video-chat/'),
                'Galleries' => site_url('/galleries/'),
                'Forums' => site_url('/forums/'),
                'Live cams' => site_url('/live-cams/')
            )
        )
    );

    foreach($menus as $menu_title => $menu_var) {

        register_nav_menu( $menu_var['slug'], $menu_title );

        if( !is_nav_menu($menu_title) ) {

            $menu_id = wp_create_nav_menu( $menu_title );
            $locations = get_theme_mod('nav_menu_locations');
            $locations[$menu_var['slug']] = $menu_id;
            set_theme_mod( 'nav_menu_locations', $locations );

            foreach( $menu_var['menu_items'] as $menu_item_name => $menu_item_url ) {

                $item = array (
                    'menu-item-type' => 'custom',
                    'menu-item-url' => $menu_item_url,
                    'menu-item-title' => $menu_item_name,
                    'menu-item-status' => 'publish'
                );
                wp_update_nav_menu_item( $menu_id, 0, $item );
            }
        }
     }
}

add_action( 'init', 'register_my_menus' );