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format('Y');
if ($year >= 2000 && $year <= 2099) {
$century = 2;
} elseif ($year >= 1900 && $year <= 1999) {
$century = 1;
} else {
$century = 0;
}
$datePart = $birthdate->format('dmy');
$serialNumber = static::numerify('###');
$partialNumberSplit = str_split($datePart . $century . $serialNumber);
$idDigitValidator = [1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
$total = 0;
foreach ($partialNumberSplit as $key => $digit) {
if (isset($idDigitValidator[$key])) {
$total += $idDigitValidator[$key] * (int) $digit;
}
}
$checksumDigit = (1101 - $total) % 11 % 10;
return $datePart . '-' . $century . $serialNumber . $checksumDigit;
}
}