Edit File: RewindableGenerator.php
<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\DependencyInjection\Argument; /** * @internal */ class RewindableGenerator implements \IteratorAggregate, \Countable { private $generator; private $count; /** * @param int|callable $count */ public function __construct(callable $generator, $count) { $this->generator = $generator; $this->count = $count; } public function getIterator(): \Traversable { $g = $this->generator; return $g(); } public function count(): int { if (\is_callable($count = $this->count)) { $this->count = $count(); } return $this->count; } }