gmp_nextprime

Find next prime number

&reftitle.description; `GMP` `gmp_nextprime` ``GMP``int``string```num`

Find next prime number

&reftitle.parameters;

`num`

- &gmp.parameter;
&reftitle.returnvalues;

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

&reftitle.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";
    ?>

&example.outputs;

    11
    2

&reftitle.notes;

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