php队列算法[转]

<?php
/**
* php队列算法
*
* Create On 2010-6-4
* Author Been
* QQ:281443751
* Email:binbin1129@126.com
**/
class data {
//数据
private $data;

public function __construct($data){
$this->data=$data;
echo $data.":哥进队了！<br>";
}

public function getData(){
return $this->data;
}
public function __destruct(){
echo $this->data."：哥走了！<br>";
}
}
class queue{
protected $front;//队头
protected $rear;//队尾
protected $queue=array('0'=>'队尾');//存储队列
protected $maxsize;//最大数

public function __construct($size){
$this->initQ($size);
}
//初始化队列
private function initQ($size){
$this->front=0;
$this->rear=0;
$this->maxsize=$size;
}
//判断队空
public function QIsEmpty(){
return $this->front==$this->rear;
}
//判断队满
public function QIsFull(){
return ($this->front-$this->rear)==$this->maxsize;
}
//获取队首数据
public function getFrontDate(){
return $this->queue[$this->front]->getData();
}
//入队
public function InQ($data){
if($this->QIsFull())echo $data.":我一来咋就满了！（队满不能入队，请等待！）<br>";
else {
$this->front++;
for($i=$this->front;$i>$this->rear;$i--){
//echo $data;
if($this->queue[$i])unset($this->queue[$i]);
$this->queue[$i]=$this->queue[$i-1];
}
$this->queue[$this->rear+1]=new data($data);
//print_r($this->queue);
//echo $this->front;
echo '入队成功！<br>';
}
}
//出队
public function OutQ(){
if($this->QIsEmpty())echo "队空不能出队！<br>";
else{
unset($this->queue[$this->front]);
$this->front--;
//print_r($this->queue);
//echo $this->front;
echo "出队成功！<br>";
}
}
}
$q=new queue(3);
$q->InQ("小苗");
$q->InQ('马帅');
$q->InQ('溜冰');
$q->InQ('张世佳');
$q->OutQ();
$q->InQ("周瑞晓");
$q->OutQ();
$q->OutQ();
$q->OutQ();
$q->OutQ();

转自: http://www.cnblogs.com/huangtaozi/p/3758815.html