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Edit File: VariadicValueResolver.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\HttpKernel\Controller\ArgumentResolver;

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

/**
 * Yields a variadic argument's values from the request attributes.
 *
 * @author Iltar van der Berg <kjarli@gmail.com>
 */
final class VariadicValueResolver implements ValueResolverInterface
{
    public function resolve(Request $request, ArgumentMetadata $argument): array
    {
        if (!$argument->isVariadic() || !$request->attributes->has($argument->getName())) {
            return [];
        }

$values = $request->attributes->get($argument->getName());

if (!\is_array($values)) {
            throw new \InvalidArgumentException(sprintf('The action argument "...$%1$s" is required to be an array, the request attribute "%1$s" contains a type of "%2$s" instead.', $argument->getName(), get_debug_type($values)));
        }

return $values;
    }
}

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