Дмитрий
55 lines
1.3 KiB
PHP
55 lines
1.3 KiB
PHP
<?php
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declare(strict_types=1);
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namespace App\Support;
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final class InnValidator
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{
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public static function isValid(string $inn, string $subjectType): bool
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{
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if ($subjectType === 'individual') {
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return true; // физлицу ИНН не требуется (SP2)
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}
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if (! ctype_digit($inn)) {
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return false;
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}
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return match ($subjectType) {
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'legal_entity' => self::valid10($inn),
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'sole_proprietor' => self::valid12($inn),
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default => false,
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};
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}
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private static function valid10(string $inn): bool
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{
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if (strlen($inn) !== 10) {
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return false;
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}
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return self::checksum($inn, [2, 4, 10, 3, 5, 9, 4, 6, 8]) === (int) $inn[9];
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}
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private static function valid12(string $inn): bool
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{
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if (strlen($inn) !== 12) {
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return false;
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}
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return self::checksum($inn, [7, 2, 4, 10, 3, 5, 9, 4, 6, 8]) === (int) $inn[10]
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&& self::checksum($inn, [3, 7, 2, 4, 10, 3, 5, 9, 4, 6, 8]) === (int) $inn[11];
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}
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/** @param int[] $weights */
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private static function checksum(string $inn, array $weights): int
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{
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$sum = 0;
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foreach ($weights as $i => $w) {
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$sum += $w * (int) $inn[$i];
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}
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return ($sum % 11) % 10;
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}
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}
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