//Test PrimeNumbers
<?php

require __DIR__ . '/../PrimeNumbers.php';

use    PHPUnit\Framework\TestCase;

class UserTest extends TestCase
{
    public function testPrimeNumbers()
    {
        $this->assertEquals([1, 3, 5, 15], PrimeNumbers::getPrimeNumbers(15));
        $this->assertEquals(false, PrimeNumbers::getPrimeNumbers('jaś fasola'));
        $this->assertEquals([], PrimeNumbers::getPrimeNumbers(0));
        $this->assertEquals(false, PrimeNumbers::getPrimeNumbers(-250));
        $this->assertEquals(false, PrimeNumbers::getPrimeNumbers(1.25));
    }
}


//////////////////
//PrimeNumbres
<?php

class PrimeNumbers
{
    static public function getPrimeNumbers($number)
    {
        if (!is_int($number) || $number < 0) {
            return false;
        }

        $res = [];
        for ($i = 1; $i <= $number; $i++) {
            if ($number % $i == 0) {
                $res[] = $i;
            }
        }

        return $res;
    }
}