singletontrait.php

См. документацию.

<?php
 
namespace Bitrix\Socialnetwork\Helper;
 
use RuntimeException;
 
trait SingletonTrait
{
    use InstanceTrait;
 
    private function __construct()
    {
    }
 
    public function __clone()
    {
        throw new RuntimeException('Cannot clone a singleton');
    }
 
    public function __wakeup()
    {
        throw new RuntimeException('Cannot wake up a singleton');
    }
}