Soal Test Nomer 4

<?php
    /**
     * Bilangan Prima
     * @author Miftach Hidayatullah <miftarockavanka@gmail.com>
     */
    $y = 30;
    for($x=2;$x<=$y;$x++)
        {
            $bilPrima = true;
            for($z=2; $z<$x;$z++)
                {
                    if($x%$z == 0){
                        $bilPrima = false;
                    }
                }
            if($bilPrima){
                echo $x." ";
            }

        }
?>