【PHP】シンプルな連結リストを実装

simple-linkedlist.php

<?php

namespace Acme;

class LinkedList implements Iterator, Countable
{
	private $list;
		
	public function add($value)
	{
		$this->list[] = $value;
	}
	
	public function count()
	{
		return count($this->list);
	}

	public function current()
	{
		return current($this->list);
	}

	public function key()
	{
		return key($this->list);
	}

	public function next()
	{
		return next($this->list);
	}

	public function rewind()
	{
		return reset($this->list);
	}

	public function valid()
	{
		return key($this->list) !== null;
	}

}