gmp_prob_prime

Function • Params and return types changed in PHP 8.0

Check if number is "probably prime".

PHP 5
PHP 7
PHP 8.0
Improved
PHP 8.1
PHP 8.2-8.3
PHP 8.4
PHP 8.5
PHP 8.6

gmp_prob_prime Function synopsis

gmp_prob_prime(GMP|string|int $num, int $repetitions = 10): int

Parameters

$num

TypeGMP|string|int

The number being checked as a prime.

$repetitions

OptionalTypeintDefault value10

Reasonable values of $repetitions vary from 5 to 10 (default being 10); a higher value lowers the probability for a non-prime to pass as a "probable" prime.

Return value

Typeint

If this function returns 0, $num is definitely not prime. If it returns 1, then $num is "probably" prime. If it returns 2, then $num is surely prime.

Changes to the gmp_prob_prime Function

PHP 8.0

  • Return type added: int
  • Parameter name of parameter #1 changed: $a to $num
  • Parameter type added for parameter #1 ($num): GMP|string|int
  • Parameter name of parameter #2 changed: $reps to $repetitions
  • Parameter type added for parameter #2 ($repetitions): int
  • Parameter default value added for position #2 ($repetitions): 10
- gmp_prob_prime($a, $reps)
+ gmp_prob_prime(GMP|string|int $num, int $repetitions = 10): int

gmp_prob_prime Function Availability

PHP VersionAvailability
PHP 8.6Upcoming Release Yes
PHP 8.5Supported (Latest) Yes
PHP 8.4Supported Yes
PHP 8.3Security-Fixes Only Yes
PHP 8.2Security-Fixes Only Yes
PHP 8.1Unsupported Yes
PHP 8.0Unsupported Yes
PHP 7.4Unsupported Yes
PHP 7.3Unsupported Yes
PHP 7.2Unsupported Yes
PHP 7.1Unsupported Yes
PHP 7.0Unsupported Yes
PHP 5.6Unsupported Yes
PHP 5.5Unsupported Yes
PHP 5.4Unsupported Yes
PHP 5.3Unsupported Yes