<?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();