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    <h3>Editing: ConstantCollectionIterator.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann &lt;sebastian@phpunit.de&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\TextUI\XmlConfiguration;

use function count;
use function iterator_count;
use Countable;
use Iterator;

/**
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 *
 * @template-implements Iterator&lt;int, Constant&gt;
 */
final class ConstantCollectionIterator implements Countable, Iterator
{
    /**
     * @var Constant[]
     */
    private $constants;

    /**
     * @var int
     */
    private $position;

    public function __construct(ConstantCollection $constants)
    {
        $this-&gt;constants = $constants-&gt;asArray();
    }

    public function count(): int
    {
        return iterator_count($this);
    }

    public function rewind(): void
    {
        $this-&gt;position = 0;
    }

    public function valid(): bool
    {
        return $this-&gt;position &lt; count($this-&gt;constants);
    }

    public function key(): int
    {
        return $this-&gt;position;
    }

    public function current(): Constant
    {
        return $this-&gt;constants[$this-&gt;position];
    }

    public function next(): void
    {
        $this-&gt;position++;
    }
}
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