echo "------- First Version ------\n";

    for($i=1;$i<=10;$i++) {
        if(!($i % 3))
            echo "new row\n";
    }

    echo "------- Second Version  ------\n";

    $n = $c = 1;

    while($n <= 10) {
        if($c == 3) {
            $c = 1;
            echo "new row\n";
        } else {
            $c++;
        }
        $n++;
    }