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<?php
namespace byrokrat\id;
/**
* Modulo10 checkdigit calculator
*/
class Modulo10
{
* Check if the last digit of number is a valid modulo 10 check digit
*
* @param string $number
* @return bool
public static function isValid($number)
return substr($number, -1) === self::calculateCheckDigit(substr($number, 0, -1) ?: '');
}
* Calculate the modulo 10 check digit for number
* @return string
* @throws Exception\InvalidStructureException If $number is not numerical
public static function calculateCheckDigit($number)
if (!ctype_digit($number)) {
throw new Exception\InvalidStructureException(
"Number can only contain numerical characters, found: $number"
);
$weight = 2;
$sum = 0;
for ($pos=strlen($number)-1; $pos>=0; $pos--) {
$tmp = $number[$pos] * $weight;
$sum += ($tmp > 9) ? (1 + ($tmp % 10)) : $tmp;
$weight = ($weight == 2) ? 1 : 2;
$ceil = $sum;
while ($ceil % 10 != 0) {
$ceil++;
return (string)($ceil-$sum);
byrokrat /
id
