Print Bilangan Prima

prima.php

<?php

function isPrime($number) {

    if($number <= 1) {
        return false;
    }

    foreach(range(2, $number) as $i) {
        if($number % $i == 0) {
            if($i != $number) {
                return false;
            }
        }
    }


    return true;
}

echo "List Bilangan Prima s/d 100:<br>";
foreach(range(1, 100) as $i) {
    if(isPrime($i)) {
        echo $i.'<br>';
    }
}