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<?php $dt1 = new \DateTimeImmutable('2017-01-01T00:00:00.000000Z'); $dt2 = new \DateTimeImmutable('2017-01-01T00:00:00.123456Z'); $diff = $dt1->diff($dt2); //var_dump($diff); var_dump($diff->f); var_dump(get_object_vars($diff)['f']); var_dump($diff->f === get_object_vars($diff)['f']);

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