How to make Triangle Roll-Up with PHP?

Question

I found a question on google like this :

When given the input : 4, 7, 3, 6, 7

The output like this :

81

40 41

21 19 22

11 10 9 13

4  7          


        

Answer 1

Try this,

';
echo $m.' '.$n.'
';
echo $j.' '.$k.' '.$l.'
';
echo $f.' '.$g.' '.$h.' '.$i.'
';
echo $a.''.$b.' '.$c.' '.$d.' '.$e;
?>