PHP中ZipArchive压缩文件并下载打包好的文件介绍

<?php
 require'./download.php';
 /**
  * 遍历目录，打包成zip格式
  */
     class traverseDir{
         public $currentdir;//当前目录
         public $filename;//文件名
         public $fileinfo;//用于保存当前目录下的所有文件名和目录名以及文件大小
         public function __construct(){
             $this->currentdir=getcwd();//返回当前目录
         }       
         //遍历目录
         public function scandir($filepath){
             if (is_dir($filepath)){
                     $arr=scandir($filepath);
                     foreach ($arr as $k=>$v){
                         $this->fileinfo[$v][]=$this->getfilesize($v);
                     }
                 }else {
                     echo "<script>alert('当前目录不是有效目录');</script>";
                 }
         }
         /**
          * 返回文件的大小
          *
          * @param string $filename 文件名
          * @return 文件大小(KB)
          */
         public function getfilesize($fname){
             return filesize($fname)/1024;
         }
        
         /**
          * 压缩文件(zip格式)
          */
         public function tozip($items){
             $zip=new ZipArchive();
             $zipname=date('YmdHis',time());
             if (!file_exists($zipname)){
                 $zip->open($zipname.'.zip',ZipArchive::OVERWRITE);//创建一个空的zip文件
                 for ($i=0;$i<count($items);$i++){
                     $zip->addFile($this->currentdir.'/'.$items[$i],$items[$i]);
                 }
                 $zip->close();
                 $dw=new download($zipname.'.zip'); //下载文件
                 $dw->getfiles();
                 unlink($zipname.'.zip'); //下载完成后要进行删除   
             }
         }
     }
 ?>

<?php
 /**
  * 下载文件
  *
  */
     class download{
         protected $_filename;
         protected $_filepath;
         protected $_filesize;//文件大小
         public function __construct($filename){
             $this->_filename=$filename;
             $this->_filepath=dirname(__FILE__).'/'.$filename;
         }
         //获取文件名
         public function getfilename(){
             return $this->_filename;
         }
        
         //获取文件路径（包含文件名）
         public function getfilepath(){
             return $this->_filepath;
         }
        
         //获取文件大小
         public function getfilesize(){
             return $this->_filesize=number_format(filesize($this->_filepath)/(1024*1024),2);//去小数点后两位
         }
         //下载文件的功能
         public function getfiles(){
             //检查文件是否存在
             if (file_exists($this->_filepath)){
                 //打开文件
                 $file = fopen($this->_filepath,"r");
                 //返回的文件类型
                 Header("Content-type: application/octet-stream");
                 //按照字节大小返回
                 Header("Accept-Ranges: bytes");
                 //返回文件的大小
                 Header("Accept-Length: ".filesize($this->_filepath));
                 //这里对客户端的弹出对话框，对应的文件名
                 Header("Content-Disposition: attachment; filename=".$this->_filename);
                 //修改之前，一次性将数据传输给客户端
                 echo fread($file, filesize($this->_filepath));
                 //修改之后，一次只传输1024个字节的数据给客户端
                 //向客户端回送数据
                 $buffer=1024;//
                 //判断文件是否读完
                 while (!feof($file)) {
                     //将文件读入内存
                     $file_data=fread($file,$buffer);
                     //每次向客户端回送1024个字节的数据
                     echo $file_data;
                 }
                
                 fclose($file);
             }else {
                 echo "<script>alert('对不起,您要下载的文件不存在');</script>";
             }
         }
     }
 ?>

<script type="text/javascript" src="jquery-1.7.2.js"></script>
 <script type="text/javascript" src="ajax.js"></script>
 <?php
     header("Content-type:text/html;charset=utf8");
     require('./getfile.php');
     $scandir=new traverseDir();
     $scandir->scandir($scandir->currentdir);
     $scandir->currentdir;
    
     if (isset($_POST['down_load'])){
         $items=$_POST['items'];
         $scandir->tozip($items);//将文件压缩成zip格式
     }
     echo "当前的工作目录:".$scandir->currentdir;
     echo "<br>当前目录下的所有文件";
 ?>
 
 <form action="list.php" method="POST">
 <table>
     <tr>
         <td></td>
         <td>名称</td>
         <td>大小(KB)</td>
     </tr>
 <?php
     $res=$scandir->fileinfo;
     foreach ($res as $k=>$v){
         if (!($k=='.' || $k=='..'))    {//过滤掉.和..
 ?>
     <tr>
         <td><input type="checkbox" name="items[]" class="filename" value="<?php echo $k;?>"></td>
         <td><?php echo $k; ?></td>
         <td><?php echo number_format($v[0],0); ?></td>
     </tr>
 <?php
         }
     }
 ?>
     <tr>
         <td><input type="checkbox" id="selall"><label for="selall">全选</label></td>
         <td><input type="submit" name="down_load" value="打包并下载" id="tozip_tetttt"></td>
     </tr>
 </table>
 </form>