gmp_nextprime

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

gmp_nextprimeFind next prime number

Description

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

Find next prime number

Parameters

num

A GMP object, an int or a numeric string.

Return Values

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

Examples

Example #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";
?>

The above example will output:

11
2

Notes

Note:

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