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<?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 for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 1, 1 => 1, )array ( 0 => 1, 1 => 2, 2 => 1, )array ( 0 => 1, 1 => 3, 2 => 3, 3 => 1, )array ( 0 => 1, 1 => 4, 2 => 6, 3 => 4, 4 => 1, )array ( 0 => 1, 1 => 5, 2 => 10, 3 => 10, 4 => 5, 5 => 1, )array ( 0 => 1, 1 => 6, 2 => 15, 3 => 20, 4 => 15, 5 => 6, 6 => 1, )array ( 0 => 1, 1 => 7, 2 => 21, 3 => 35, 4 => 35, 5 => 21, 6 => 7, 7 => 1, )

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