PHP队列用法实例

/**
* 队列
*
* @author jaclon
*
*/
class Queue
{
private $_queue = array();
protected $cache = null;
protected $queuecachename;
 
/**
* 构造方法
* @param string $queuename 队列名称
*/
function __construct($queuename)
{
 
$this->cache =& Cache::instance();
$this->queuecachename = 'queue_' . $queuename;
 
$result = $this->cache->get($this->queuecachename);
if (is_array($result)) {
$this->_queue = $result;
}
}
 
/**
* 将一个单元单元放入队列末尾
* @param mixed $value
*/
function enQueue($value)
{
$this->_queue[] = $value;
$this->cache->set($this->queuecachename, $this->_queue);
 
return $this;
}
 
/**
* 将队列开头的一个或多个单元移出
* @param int $num
*/
function sliceQueue($num = 1)
{
if (count($this->_queue) < $num) {
$num = count($this->_queue);
}
$output = array_splice($this->_queue, 0, $num);
$this->cache->set($this->queuecachename, $this->_queue);
 
return $output;
}
 
/**
* 将队列开头的单元移出队列
*/
function deQueue()
{
$entry = array_shift($this->_queue);
$this->cache->set($this->queuecachename, $this->_queue);
 
return $entry;
}
 
/**
* 返回队列长度
*/
function size()
{
return count($this->_queue);
}
 
/**
* 返回队列中的第一个单元
*/
function peek()
{
return $this->_queue[0];
}
 
/**
* 返回队列中的一个或多个单元
* @param int $num
*/
function peeks($num)
{
if (count($this->_queue) < $num) {
$num = count($this->_queue);
}
return array_slice($this->_queue, 0, $num);
}
 
/**
* 消毁队列
*/
function destroy()
{
$this->cache->remove($this->queuecachename);
}
}