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

/**
 * This file is part of the ramsey/collection library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey &lt;ben@benramsey.com&gt;
 * @license http://opensource.org/licenses/MIT MIT
 */

declare(strict_types=1);

namespace Ramsey\Collection\Map;

use Ramsey\Collection\Exception\InvalidArgumentException;
use Ramsey\Collection\Tool\TypeTrait;
use Ramsey\Collection\Tool\ValueToStringTrait;

use function array_combine;
use function array_key_exists;
use function is_int;
use function var_export;

/**
 * `NamedParameterMap` represents a mapping of values to a set of named keys
 * that may optionally be typed
 *
 * @extends AbstractMap&lt;mixed&gt;
 */
class NamedParameterMap extends AbstractMap
{
    use TypeTrait;
    use ValueToStringTrait;

    /**
     * Named parameters defined for this map.
     *
     * @var array&lt;string, string&gt;
     */
    protected array $namedParameters;

    /**
     * Constructs a new `NamedParameterMap`.
     *
     * @param array&lt;array-key, string&gt; $namedParameters The named parameters defined for this map.
     * @param array&lt;array-key, mixed&gt; $data An initial set of data to set on this map.
     */
    public function __construct(array $namedParameters, array $data = [])
    {
        $this-&gt;namedParameters = $this-&gt;filterNamedParameters($namedParameters);
        parent::__construct($data);
    }

    /**
     * Returns named parameters set for this `NamedParameterMap`.
     *
     * @return array&lt;string, string&gt;
     */
    public function getNamedParameters(): array
    {
        return $this-&gt;namedParameters;
    }

    /**
     * @inheritDoc
     */
    public function offsetSet($offset, $value): void
    {
        if ($offset === null) {
            throw new InvalidArgumentException(
                'Map elements are key/value pairs; a key must be provided for '
                . 'value ' . var_export($value, true),
            );
        }

        if (!array_key_exists($offset, $this-&gt;namedParameters)) {
            throw new InvalidArgumentException(
                'Attempting to set value for unconfigured parameter \''
                . $offset . '\'',
            );
        }

        if ($this-&gt;checkType($this-&gt;namedParameters[$offset], $value) === false) {
            throw new InvalidArgumentException(
                'Value for \'' . $offset . '\' must be of type '
                . $this-&gt;namedParameters[$offset] . '; value is '
                . $this-&gt;toolValueToString($value),
            );
        }

        $this-&gt;data[$offset] = $value;
    }

    /**
     * Given an array of named parameters, constructs a proper mapping of
     * named parameters to types.
     *
     * @param array&lt;array-key, string&gt; $namedParameters The named parameters to filter.
     *
     * @return array&lt;string, string&gt;
     */
    protected function filterNamedParameters(array $namedParameters): array
    {
        $names = [];
        $types = [];

        foreach ($namedParameters as $key =&gt; $value) {
            if (is_int($key)) {
                $names[] = $value;
                $types[] = 'mixed';
            } else {
                $names[] = $key;
                $types[] = $value;
            }
        }

        return array_combine($names, $types) ?: [];
    }
}
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