<?php
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
class Singleton
{
    private static $uniqueInstance = null;

    public static function getInstance()
    {
        if (self::$uniqueInstance === null) {
            self::$uniqueInstance = new self;
        }

        return self::$uniqueInstance;
    }

    protected function __construct()
    {
    }

    private function __clone()
    {
    }
}