19 Digit Random Number

[ryanhn]

I'm trying to generate a 19 digit random number using:

$cnum = mt_rand(1000000000000000000, 9000000000000000000);

Instead of a 19 digit number I'm getting negative numbers with fewer digits. Any idea what's going on?

[ryanhn]

I just tried mt_getrandmax() and found out the highest random number my webhost can generate is 2147483647. Mystery solved. Does anyone know of a way to generate higher random numbers? It doesn't have to be 19 digits, but higher than the 10 I can get with mt_rand() would be nice.