(PHP 4 >= 4.0.4)
gmp_prob_prime -- Check if number is "probably prime"
Description
int gmp_prob_prime (resource a [, int reps])
If this function returns 0, a is definitely not prime. If it returns 1,
then a is "probably" prime. If it returns 2, then a is surely
prime. Reasonable values of reps vary from 5 to 10 (default being 10); a higher
value lowers the probability for a non-prime to pass as a "probable" prime.
The function uses Miller-Rabin's probabilistic test.
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