Php/docs/function.gmp-nextprime
From Get docs
gmp_nextprime
(PHP 5 >= 5.2.0, PHP 7)
gmp_nextprime — Find next prime number
Parameters
a- 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.
Return Values
Return the next prime number greater than a,
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 -1000echo 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.
