Hackerrank – Staircase

<?php
function staircase($n) {
    for ($i=1; $i<=$n; $i++) {
        for ($j=($n -1); $j>=$i; $j--){
            echo " ";
        }
        
        for ($k=1; $k<=$i; $k++) {
            echo "#";
        }
        echo "\n";
    }
}

$n = 6;

staircase($n);