生成星号图案

下面是生成上面三种星号图案方法。
function nbspStar(int $num = 0,$star = '******'): string
{
    $result = '';
    for ($i = 0; $i < $num; $i++) {
        $spaces = str_repeat('&nbsp';, $i);
        $result .= $spaces . $star . "<br>";
    }
    return $result;
}

$mystar = nbspStar(5);
echo $mystar;

function ascStar(int $num = 0): string
{
    $result = '';
    $j = $num;
    for ($i = 1; $i <= $num; $i++) {
        $spaces = str_repeat('&nbsp';, $j - 1);
        $star = str_repeat('*', 2*$i - 1);
        $result .= $spaces . $star . "<br>";
        $j--;
    }
    return $result;
}

$mystar = ascStar(5);
echo $mystar;

function descStar(int $num = 0): string
{
    $result = '';
    $j = 0;
    for ($i = $num; $i > 0; $i--) {
        $spaces = str_repeat('&nbsp';, $j);
        $star = str_repeat('*', 2*$i - 1);
        $result .= $spaces . $star . "<br>";
        $j++;
    }
    return $result;
}

$mystar = descStar(5);
echo $mystar;