gmp_prob_prime
(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
gmp_prob_prime — Check if number is "probably prime"
說明
The function uses Miller-Rabin's probabilistic test to check if a number is a prime.
參數
返回值
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.
範例
示例 #1 gmp_prob_prime() example
<?php
// definitely not a prime
echo gmp_prob_prime("6") . "\n";
// probably a prime
echo gmp_prob_prime("1111111111111111111") . "\n";
// definitely a prime
echo gmp_prob_prime("11") . "\n";
?>
以上例程會輸出：
0 1 2