gmp_nextprime

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

gmp_nextprimeFind next prime number

说明

gmp_nextprime(GMP|int|string $num): GMP

Find next prime number

参数

num

GMP 对象或 int ,或数字string

返回值

Return the next prime number greater than num, as a GMP number.

示例

示例 #1 gmp_nextprime() example

<?php
$prime1
= gmp_nextprime(10); // next prime number greater than 10
$prime2 = gmp_nextprime(-1000); // next prime number greater than -1000

echo gmp_strval($prime1) . "\n";
echo
gmp_strval($prime2) . "\n";
?>

以上示例会输出:

11
2

注释

注意:

This function uses a probabilistic algorithm to identify primes and chances to get a composite number are extremely small.