PHP Manual: gmp_nextprime


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gmp_nextprime

(no version information, might be only in CVS)

gmp_nextprime -- Find next prime number

Description

resource gmp_nextprime ( int a )

Return next prime number greater than a.

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

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 printout of the above program is:

11
-997