Online PHP editor | output for dDAaI

<?php error_reporting(-1); $total = 12; $skip = 4; $numberLeft = 1; for ($i = 1; $i <= $total; $i++){ $positions[$i] = $i; } for ($i = $total; $i >= $skip; $i--){ if ($total - $numberLeft < $skip - 1){ $numberLeft = $skip - ($total - $numberLeft) - 1; } else { $numberLeft = $numberLeft + $skip - 1; } for($j = $numberLeft; $j < $total; $j++){ $positions[$j] = $positions[$j+1]; } unset($positions[$total]); $total--; } echo "Выигрышные места: ".implode(", ", $positions);