Mobile phone number modulo, string to long integer

Sometimes it is necessary to convert the mobile phone number into an integer calculation, if it is a string, the calculation is wrong.

But the phone number is 11 digits, direct (int) or (integer) will overflow because it exceeds the boundary.

Int can't be float. .

$num = (float)$phone_num % 99 + 1;

或

$phone_num = $phone_num +0;
$num = $phone_num % 99 + 1;

当浮点类型过大会出现负数等问题，如下即可解决
$num = intval(fmod(floatval($phone_num), 99));