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gmp_nextprime

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

gmp_nextprime — Find next prime number

说明

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

Find next prime number

参数

num

GMP 对象、int 或 string，可以按照跟在 gmp_init() 中使用字符串并自动检测 base（即当 base 等于 0 时）相同的逻辑将其解释为数字。

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.