Named Tuple

namedtuple.php

<?php

class NamedTuple {
    public static $__instances = array();

    private $uuid;
    private $values = array();

    public function __construct() {
        $found = false;
        foreach (static::$__instances as $uuid => $keys) {
            if (is_a($this, 'NamedTuple_' . $uuid)) {
                $found = true;
                break;
            }
        }

        if (!$found) {
            throw new LogicException('UUID not found');
        }

        $values = func_get_args();
        foreach ($keys as $index => $key) {
            $this->values[$key] = isset($values[$index])
                ? $values[$index] : null;
        }

        $this->uuid = $uuid;
    }

    public function __get($key) {
        if (!isset($this->$key)) {
            throw new LogicException('Key "' . $key . '" not found');
        }

        return $this->values[$key];
    }

    public function __set($key, $value) {
        if (!isset($this->$key)) {
            throw new LogicException('Key "' . $key . '" not found');
        }

        $this->values[$key] = $value;
    }

    public function __isset($key) {
        return isset($this->values[$key]);
    }
}

function namedtuple() {
    $uuid = uniqid();

    NamedTuple::$__instances[$uuid] = func_get_args();

    class_alias('NamedTuple', 'NamedTuple_' . $uuid, false);

    return 'NamedTuple_' . $uuid;
}

$Request = namedtuple('method', 'uri');
$request = new $Request('GET', '/');

assert($request->method === 'GET');