While_8

<form method="post" action="">
    Masukkan jumlah bintang terbanyak <input type="text" name ="jum"><br>
    <input type="submit" name="submit" value="submit">
    <input type="reset" name="reset" value="reset">
</form>

<?php
    $jum=$_POST[jum];
    $i=1;
    while($i<=$jum)
    {
        $a=1;
        while ($a<=$i)
        {
            echo "*";
            $a++;
        }
        $i++;
        echo "<br>";
    }
    while($jum>=1)
    {
        $i=$jum;
        while ($i>=1)
        {
            echo "*";
            $i--;
        }
        $jum--;
        echo "<br>";
    }
?>