gmp_nextprime

(PHP 5, PHP 7 >= 5.2.0)

Find next prime number

GMP gmp_nextprime ( int $a )

Find next prime number

Parameters:

Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.

Returns:

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

Notes:

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

Examples:

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
-997

Links:

http://php.net/manual/en/function.gmp-nextprime.php

doc_php

2016-02-24 16:02:19

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