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please, what it means the "?" in before DateTimeZone

public __construct(string $datetime = "now", ?DateTimeZone $timezone = null)

thanks a lot

dev13
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    [Nullable Types](https://www.php.net/manual/en/migration71.new-features.php#migration71.new-features.nullable-types) – Sammitch Nov 05 '21 at 00:30

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