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gmp_nextprime

Find next prime number (PHP 5 >= 5.2.0)
resource gmp_nextprime ( int a )

Find next prime number

Parameters

a

It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

Return Values

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

Examples

Example 802. 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


Notes

Note:

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