利用PHP实现与ASP Banner组件相似的类

<?php
/*******************************************************
作者: 吴振亨 (biz)--phpscript
e-mail:wuzhenheng@china.com
web: http://phpscript.osh.com.cn
文件名：adrotator.class.php3                 
版权声明:                      

如果您使用了本文件，请给作者写一封e-mail   
如有问题欢迎与作者联系
谢谢您的关注!                     
********************************************************/

/*
广告条管理程序
public method
    getadvertisement($adfile)

parameters
    target=
    width=
    height=
    border=
    redirect=

*/
class adrotator {
    var $target="_blank";
    var $width="460";
    var $height="60";
    var $border=0;
    var $redirect="";
    var $bannerdata=array ();
    var $randtemp=1;

function adrotator()
    {
    }
/*
public  
返回广告的链接字串
*/
function getadvertisement($adfile)
    {
    if(count($this->bannerdata)==0)
        {
        $this->bannerdata=$this->readadfile($adfile);
        }
    $addata=$this->bannerdata;

    $uplimited=count($addata);

    //随机产生一个id
    srand((double)microtime()*1000000000000000000);
    $id=@rand(1,$uplimited);

        while($this->randtemp==$id)
               {
            srand((double)microtime()*1000000000000000000);
               //$id=@rand(1,count($addata));
               $id=@rand(1,$uplimited);
               }
           $this->randtemp=$id;

       //echo $id;
       //echo count($addata);
       //echo $addata[5]["image"];

         
        $linkstring=" <a href="".$this->redirect;
        $linkstring.="?url=".$addata[$id]["url"];
        $linkstring.="" target="".$this->target;
        $linkstring.="" title="".$addata[$id]["title"];
        $linkstring.="" >";
        $linkstring.=" <img border="".$this->border;
        $linkstring.="" src="".$addata[$id]["image"];
        $linkstring.="" width="".$this->width;
        $linkstring.="" height="".$this->height;
        $linkstring.="" >";
        $linkstring.="</a>";

        //echo $linkstring;
        return $linkstring;
    }
/*
private
读入文件的基本设置
*/
function readadfile($adfile)
    {
    $fp=fopen($adfile,"r");
    while($buffer=@fgets($fp,1024))
        {
        if(!eregi("#",$buffer))
            {
            if(eregi("^*",$buffer))
                {
                $switchto="off";
                }

            $settemp=split("=",$buffer);

            if($switchto=="")
                {
                switch     ($settemp[0])
                    {
                    case "redirect":
                    $this->redirect=$settemp[1];
                    break;

                    case "width":
                    $this->width=$settemp[1];
                    break;

                    case "height":
                    $this->height=$settemp[1];
                    break;

                    case "border":
                    $this->border=$settemp[1];
                    break;
                    case "target":
                    $this->target=$settemp[1];
                    break;
                    }
                }
            else
                {
                switch     ($settemp[0])
                    {
                    case "image":
                    $i++;
                    $bannerdata[$i]["image"]=$settemp[1];
                    //echo "<br>";echo $buffer;echo $settemp[1];
                    //echo $bannerdata[$i]["image"];
                    break;

                    case "url":
                    $bannerdata[$i]["url"]=$settemp[1];
                    break;

                    case "title":
                    $bannerdata[$i]["title"]=$settemp[1];
                    break;

                    case "rate":
                    $bannerdata[$i]["rate"]=$settemp[1];
                    break;
                    }//end of switch
                }//end of if($switch)
            }//end of if(#)

        }//end of while

    return $bannerdata;

    }//end of function

}//end of class

/*
使用方法
广告设置文件书写格式banner.txt
------开始---
redirect=./adredir.asp
width=468
height=60
border=0
*

#注释

#某某公司广告1
image=../banner/1.gif
url=http://www.asps0ite.com1
title=one
rate=30
----结束-----
说明：
与asp的广告组件相仿
*表示设置,其他为图片的设置 #：表示注释

----使用-----
$banner=new adrotator();
echo $banner->getadvertisement("./banner.txt");
echo $banner->getadvertisement("./banner.txt");
echo $banner->getadvertisement("./banner.txt");
*/
?>  

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