(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
gmp_prob_prime — Check if number is "probably prime"
The function uses Miller-Rabin's probabilistic test to check if a number is a prime.
If this function returns 0, num
is
definitely not prime. If it returns 1, then
num
is "probably" prime. If it returns 2,
then num
is surely prime.
Example #1 gmp_prob_prime() example
<?php// definitely not a primeecho gmp_prob_prime("6") . "\n";// probably a primeecho gmp_prob_prime("1111111111111111111") . "\n";// definitely a primeecho gmp_prob_prime("11") . "\n";?>
The above example will output:
0 1 2