如何使用Composer和phpgt/propfunc解决PHP属性访问和修改问题？

composer require phpgt/propfunc

use Gt\PropFunc\MagicProp;

/**
 * @property-read bool $future True if the day is in the future
 * @property-read int $daysApart Days between now and this day
 */
class Day {
    use MagicProp;

    public function __construct(
        private DateTimeInterface $dateTime
    ) {}

    // Expose the "dateTime" private property with read-only access:
    private function __prop_get_dateTime(): DateTimeInterface {
        return $this->dateTime;
    }

    // Expose the "future" calculated property with read-only access:
    private function __prop_get_future(): bool {
        $now = new DateTime();
        return $now < $this->dateTime;
    }

    // Expose the "daysApart" calculated property with read-only access:
    private function __prop_get_daysApart(): int {
        $now = new DateTime();
        $diff = $now->diff($this->dateTime);
        return $diff->days;
    }
}

$day = new Day($dateTime);
echo "Day is $day->daysApart days in the ";
echo $day->future ? "future" : "past";
echo PHP_EOL;
$day->daysApart = 10; // 这行代码会抛出异常，因为 daysApart 是只读属性