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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 = $verify_num % 11; } elseif (strlen($ogrn) == 15) { $verify_num = intval(substr($ogrn, 0, 14)); $check_num = intval(substr($ogrn, -1)); $res_num = $verify_num % 13; } else return false; if ($res_num > 9) { $res_num = $res_num - round($res_num/10)*10; } return ($res_num == $check_num); } if(checkOGRN('311333426300144')) echo 'OK'; else echo 'Error';

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