http://www.are.ir/article/shenasameli/shenasa_meli.htm تبدیل شده از کد PHP بررسی صحت شناسه ملی حقوقی در

validation.php

function isValidLegalNationalID($code)
{
        $length = strlen($code);
        if ($length < 11 || intval($code) == 0)
            return false;
        if (intval(substr($code, 3, 6)) == 0) return false;
        $c = intval(substr($code, 10, 1));
        $d = intval(substr($code, 9, 1)) + 2;
        $z = [29, 27, 23, 19, 17];
        $s = 0;
        for ($i = 0; $i < 10; $i++) {
            $s += ($d + intval(substr($code, $i, 1))) * $z[$i % 5];
        }
        $s = $s % 11;
        if ($s == 10)
            $s = 0;
        return $c == $s;
}