vendor/symfony/http-foundation/ParameterBag.php

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<?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\HttpFoundation;

use Symfony\Component\HttpFoundation\Exception\BadRequestException;

/**
 * ParameterBag is a container for key/value pairs.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @implements \IteratorAggregate<string, mixed>
 */
class ParameterBag implements \IteratorAggregate, \Countable
{
    /**
     * Parameter storage.
     */
    protected $parameters;

    public function __construct(array $parameters = [])
    {
        $this->parameters = $parameters;
    }

    /**
     * Returns the parameters.
     *
     * @param string|null $key The name of the parameter to return or null to get them all
     *
     * @return array
     */
    public function all(/* string $key = null */)
    {
        $key = \func_num_args() > 0 ? func_get_arg(0) : null;

        if (null === $key) {
            return $this->parameters;
        }

        if (!\is_array($value = $this->parameters[$key] ?? [])) {
            throw new BadRequestException(sprintf('Unexpected value for parameter "%s": expecting "array", got "%s".', $key, get_debug_type($value)));
        }

        return $value;
    }

    /**
     * Returns the parameter keys.
     *
     * @return array