Stacking data in X columns

ColumnedList.php

<?php

class ColumnedList extends SS_ListDecorator {

	/**
	 * @param  int $columns
	 * @return array
	 */
	public function stack($columns) {
		$total = $this->list->count();
		$perColumn = ceil($total / $columns);
		$result = array_chunk($this->list->toArray(), $perColumn);

		foreach($result as $i => $column) {
			$result[$i] = new ArrayList($column);
		}

		return $result;
	}

	/**
	 * Stacks data in columns
	 * 
	 * @param  int $columns The target number of columns
	 * @param  string $children Name of the control under which children can be iterated on
	 * @return ArrayList
	 */
	public function Stacked($columns, $children = 'Children') {
		$stacked = $this->stack($columns);
		$result  = new ArrayList();

		foreach($stacked as $list) {
			$list = self::create($list);
			$result->push(new ArrayData(array(
				$children => $list
			)));
		}

		return $result;
	}

}