How to Trigger Cloning from Custom Code or Another Plugin

$array_of_post_types = array(
	'attachment',
	'page',
	'post',
	'product',
	'revision',
	'wp_global_styles',
);
$array_of_tables = array(
	'wp_commentmeta',
	'wp_comments',
	'wp_links',
	'wp_options',
	'wp_postmeta',
	'wp_posts',
	'wp_term_relationships',
	'wp_term_taxonomy',
	'wp_termmeta',
	'wp_terms',
);

/**
 * Set up the cloning request.
 * These are the same fields that get submitted via an AJAX request when cloning via the
 * admin interface, so you can inspect that request to determine other ways to configure
 * the parameters, particularly if you're using NS Cloner Pro and want to use another
 * clone mode (like clone-over or teleport / remote cloning)
 */
 $request = array(
    'clone_mode'           => 'core',
    'source_id'            => 1, // any blog/site id on network
    'target_name'          => 'subdomain-or-subdir',
    'target_title'         => 'New Site Title',
    'tables_to_clone'      => $array_of_tables,
    'do_copy_posts'        => 1,
     'post_types_to_clone' => $array_of_post_types, // can customize post types . . .
    'debug'                => 1,
    'clone_nonce'          => wp_create_nonce( 'ns_cloner' ),
 );

// Load WordPress (ONLY if invoking this from outside WordPress).
// Other plugins and themes do NOT need to do this.
require_once( 'wp-load.php' );

// This is required to bootstrap the required plugin classes.
ns_cloner()->init();

foreach ( $request as $key => $value ) {
	ns_cloner_request()->set( $key, $value );
}
ns_cloner_request()->set_up_vars();
ns_cloner_request()->save();
// Run init to begin. This will run in the background
ns_cloner()->process_manager->init();