split items over columns

gistfile1.txt

	$numColumns = 3;
	$itemsPerColumn = ceil(count($items)/$numColumns);
	$keys = array_keys($items);
	$result = array();
	for($i=0;$i<count($keys);$i++) {
		$col = ($i % $numColumns);
		$x = floor($i / $numColumns) + ($col * $itemsPerColumn);
		$k = $keys[$x];
		$result[$k] = $items[$k];
	}
	$items = $result;