echo "<pre>";
for ($i = 1; $i <= 8; $i++) {
    for ($j = 1; $j <= 10 - $i; $j++) {
        echo " ";
    }
    for ($k = 1; $k <= (2 * $i - 1); $k++) {
        echo "*";
    }
    echo "<br>";
}
echo "</pre>";