Question

So, I have a PHP script:

<?
rand(1000000000000,9999999999999);

The expected result is a number with 13 digits.

But it’s returning some weird numbers, as:

987419207
1032717476
-455563764

Does anyone know what’s going on?

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PHP: 5.2.17

OS: Tested on Debian Squeeze and Windows 7, both 64 bits

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Solution (workaround)

<?
echo rand(10000,99999).rand(10000000,99999999);

Answer 1

Use getrandmax() to see the max value that you can get from rand(), its clearly a overflow problem.

you could use 2 of this int and make a longer one, calling rand for a 6 digit and again for a 7 digits, just an idea.