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    <h3>Editing: ConstantCollection.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 Countable;
use IteratorAggregate;

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

    /**
     * @param Constant[] $constants
     */
    public static function fromArray(array $constants): self
    {
        return new self(...$constants);
    }

    private function __construct(Constant ...$constants)
    {
        $this-&gt;constants = $constants;
    }

    /**
     * @return Constant[]
     */
    public function asArray(): array
    {
        return $this-&gt;constants;
    }

    public function count(): int
    {
        return count($this-&gt;constants);
    }

    public function getIterator(): ConstantCollectionIterator
    {
        return new ConstantCollectionIterator($this);
    }
}
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