Oihana Php Core

isPrime.php

Tells whether an integer is a prime number.


    
                    isPrime(int $n) : bool

Any integer lower than 2 is not prime. The test uses 6k ± 1 trial division up to √n.

example

use function oihana\core\maths\isPrime;

isPrime( 2 )  ; // true
isPrime( 17 ) ; // true
isPrime( 25 ) ; // false
isPrime( 1 )  ; // false

author

Marc Alcaraz (ekameleon)

since

1.0.9

bool —

true if $n is prime, false otherwise.