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<?php function checkOGRN($ogrn){ if (strlen($ogrn) == 13) { $verify_num = intval(substr($ogrn, 0, 12)); $check_num = intval(substr($ogrn, -1)); $res_num = $verify_num % 11; if ($res_num > 9) $res_num - round($res_num/10)*10; if ($result == $check) return true; } elseif (strlen($ogrn) == 15) { $verify_num = intval(substr($ogrn, 0, 14)); $check_num = intval(substr($ogrn, -1)); $res_num = $verify_num % 13; if ($res_num > 9) $res_num - round($res_num/10)*10; if ($result == $check) return true; } else return false; } print_r(checkOGRN('311333426300044'));

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39.76 ms | 405 KiB | 6 Q