php rand（）函数显示负值

I have this code for generate a random positive number:

$token= rand(12132423534, 9285328457237);

Sometimes $token value is a negative number. I think the int value is in overflow.....but wich is the maximum value for not have this error? thanks

The maximum value a PHP integer on a 32-bit Machine is 2147483647 . You need the GMP Extension for your current scenario.

PHP has getrandmax() function specially for detecting maximum possible value returned by rand(). BTW, why don't you using mt_rand() (with mt_getrandmax()), which generates better randoms & faster?