(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.
numThe number being checked as a prime.
Ein GMP-Object, ein Integer oder eine numeriche Zeichenkette.
repetitions
Reasonable values
of repetitions vary from 5 to 10 (default being
10); a higher value lowers the probability for a non-prime to
pass as a "probable" prime.
Ein GMP-Object, ein Integer oder eine numeriche Zeichenkette.
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.
Beispiel #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";
?>Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
0 1 2