Online PHP editor | output for edLNX

<?php class NIP { private const WEIGHTS = [6, 5, 7, 2, 3, 4, 5, 6, 7]; private const NIP_MODULO = 11; private const INVALID_CHECKSUM = 10; public static function validate(string $nip): bool { $value = preg_replace('/[\s-]/', '', $nip); if ('0000000000' === $value || !preg_match('/^\d{10}$/', $value)) { return false; } $checkSum = self::getChecksum($value); if (self::INVALID_CHECKSUM === $checkSum || $checkSum !== ((int) (substr($value, -1)))) { return false; } return true; } private static function getChecksum(string $nip): int { $sum = 0; foreach (self::WEIGHTS as $key => $weight) { $sum += $weight * ((int) $nip[$key]); } return $sum % self::NIP_MODULO; } } $nip_numbers = array( "1074238796", "5366239267", "1071206063", "1160045242", "8123035307", "5361869035", "9322423343", "1191232175", "1079704010", "1560650337" ); $c = new NIP(); foreach ($nip_numbers as $a) { var_dump($c->validate($a)); }