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@ 2018-10-13T16:06:36Z

<?php
$tri = [1, 1];
for ($x = 0; $x <= 6; ++$x) {
    var_export($tri);
    $trinew = [1];
    for($y = 0, $count = count($tri); $y < $count; ++$y) {
        $z = $y + 1;
        $trinew[] = $tri[$y]  + ($tri[$z] ?? 0);
    }
    $tri = $trinew;
}

Output
Performance
VLD
References
Branches

var_export: documentation ( source)

preferences:dark modelive previewkey bindings

32.65 ms | 404 KiB | 5 Q