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    <h3>Editing: RequestAttributeValueResolver.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpKernel\Controller\ArgumentResolver;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Controller\ArgumentValueResolverInterface;
use Symfony\Component\HttpKernel\ControllerMetadata\ArgumentMetadata;

/**
 * Yields a non-variadic argument's value from the request attributes.
 *
 * @author Iltar van der Berg &lt;kjarli@gmail.com&gt;
 */
final class RequestAttributeValueResolver implements ArgumentValueResolverInterface
{
    /**
     * {@inheritdoc}
     */
    public function supports(Request $request, ArgumentMetadata $argument): bool
    {
        return !$argument-&gt;isVariadic() &amp;&amp; $request-&gt;attributes-&gt;has($argument-&gt;getName());
    }

    /**
     * {@inheritdoc}
     */
    public function resolve(Request $request, ArgumentMetadata $argument): iterable
    {
        yield $request-&gt;attributes-&gt;get($argument-&gt;getName());
    }
}
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