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<?php
namespace Faker\Calculator;
class Inn
{
/**
* Generates INN Checksum
*
* https://ru.wikipedia.org/wiki/%D0%98%D0%B4%D0%B5%D0%BD%D1%82%D0%B8%D1%84%D0%B8%D0%BA%D0%B0%D1%86%D0%B8%D0%BE%D0%BD%D0%BD%D1%8B%D0%B9_%D0%BD%D0%BE%D0%BC%D0%B5%D1%80_%D0%BD%D0%B0%D0%BB%D0%BE%D0%B3%D0%BE%D0%BF%D0%BB%D0%B0%D1%82%D0%B5%D0%BB%D1%8C%D1%89%D0%B8%D0%BA%D0%B0
*
* @param string $inn
* @return string Checksum (one digit)
*/
public static function checksum($inn)
{
$multipliers = array(1 => 2, 2 => 4, 3 => 10, 4 => 3, 5 => 5, 6 => 9, 7 => 4, 8 => 6, 9 => 8);
$sum = 0;
for ($i = 1; $i <= 9; $i++) {
$sum += intval(substr($inn, $i-1, 1)) * $multipliers[$i];
}
return strval(($sum % 11) % 10);
}
/**
* Checks whether an INN has a valid checksum
*
* @param string $inn
* @return boolean
*/
public static function isValid($inn)
{
return self::checksum(substr($inn, 0, -1)) === substr($inn, -1, 1);
}
}