php实现多张图片打包下载

平时下载图片是单张图片，比较不高效。

之前自己从网上考了一个试着玩，发现不行，下载的压缩包中的图片也是只有一张。也没有找到具体原因在哪里。然后现在是又找了一个，测试了也可以，分享给大家。

<?php
class zipfile {
  var $datasec = array ();
  var $ctrl_dir = array ();
  var $eof_ctrl_dir = "x50x4bx05x06x00x00x00x00";
  var $old_offset = 0;
   
  function unix2_dostime($unixtime = 0){
    $timearray = ($unixtime == 0) ? getdate () : getdate($unixtime);    
    if ($timearray ['year'] < 1980){
      $timearray ['year'] = 1980;
      $timearray ['mon'] = 1;
      $timearray ['mday'] = 1;
      $timearray ['hours'] = 0;
      $timearray ['minutes'] = 0;
      $timearray ['seconds'] = 0;
    }
    return (($timearray ['year'] - 1980) << 25) | ($timearray ['mon'] << 21) | ($timearray ['mday'] << 16) | ($timearray ['hours'] << 11) | ($timearray ['minutes'] << 5) | ($timearray ['seconds'] >> 1);
  }
  function add_file($data, $name, $time = 0){
    $name = str_replace('\', '/', $name);
     
    $dtime = dechex($this->unix2_dostime($time));
    $hexdtime = 'x' . $dtime [6] . $dtime [7] . 'x' . $dtime [4] . $dtime [5] . 'x' . $dtime [2] . $dtime [3] . 'x' . $dtime [0] . $dtime [1];
    eval('$hexdtime = "' . $hexdtime . '";');
     
    $fr = "x50x4bx03x04";
    $fr .= "x14x00";
    $fr .= "x00x00";
    $fr .= "x08x00";
    $fr .= $hexdtime;
     
    $unc_len = strlen($data);
    $crc = crc32($data);
    $zdata = gzcompress($data);
    $zdata = substr(substr($zdata, 0, strlen($zdata)- 4), 2);
    $c_len = strlen($zdata);
    $fr .= pack('V', $crc);
    $fr .= pack('V', $c_len);
    $fr .= pack('V', $unc_len);
    $fr .= pack('v', strlen($name));
    $fr .= pack('v', 0);
    $fr .= $name;
     
    $fr .= $zdata;
    $fr .= pack('V', $crc);
    $fr .= pack('V', $c_len);
    $fr .= pack('V', $unc_len);
     
    $this->datasec [] = $fr;
     
    $cdrec = "x50x4bx01x02";
    $cdrec .= "x00x00";
    $cdrec .= "x14x00";
    $cdrec .= "x00x00";
    $cdrec .= "x08x00";
    $cdrec .= $hexdtime;
    $cdrec .= pack('V', $crc);
    $cdrec .= pack('V', $c_len);
    $cdrec .= pack('V', $unc_len);
    $cdrec .= pack('v', strlen($name));
    $cdrec .= pack('v', 0);
    $cdrec .= pack('v', 0);
    $cdrec .= pack('v', 0);
    $cdrec .= pack('v', 0);
    $cdrec .= pack('V', 32);
     
    $cdrec .= pack('V', $this->old_offset);
    $this->old_offset += strlen($fr);
     
    $cdrec .= $name;
     
    $this->ctrl_dir[] = $cdrec;
  }
  function add_path($path, $l = 0){
    $d = @opendir($path);
    $l = $l > 0 ? $l : strlen($path) + 1;
    while($v = @readdir($d)){
      if($v == '.' || $v == '..'){
        continue;
      }
      $v = $path . '/' . $v;
      if(is_dir($v)){
        $this->add_path($v, $l);
      } else {
        $this->add_file(file_get_contents($v), substr($v, $l));
      }
    }
  }
  function file(){
    $data = implode('', $this->datasec);
    $ctrldir = implode('', $this->ctrl_dir);
    return $data . $ctrldir . $this->eof_ctrl_dir . pack('v', sizeof($this->ctrl_dir)) . pack('v', sizeof($this->ctrl_dir)) . pack('V', strlen($ctrldir)) . pack('V', strlen($data)) . "x00x00";
  }
   
  function add_files($files){
    foreach($files as $file){
      if (is_file($file)){
        $data = implode("", file($file));
        $this->add_file($data, $file);
      }
    }
  }
  function output($file){
    $fp = fopen($file, "w");
    fwrite($fp, $this->file ());
    fclose($fp);
  }
} 
 
//下面是实例操作过程：
$dfile = tempnam('/tmp', 'tmp');//产生一个临时文件，用于缓存下载文件
$zip = new zipfile();
//----------------------
$filename = 'image.zip'; //下载的默认文件名
 
//以下是需要下载的图片数组信息，将需要下载的图片信息转化为类似即可
$image = array(
  array('image_src' => 'pic1.jpg', 'image_name' => '图片1.jpg'),
  array('image_src' => 'pic2.jpg', 'image_name' => 'pic/图片2.jpg'),
);
 
foreach($image as $v){
  $zip->add_file(file_get_contents($v['image_src']), $v['image_name']);
  // 添加打包的图片，第一个参数是图片内容，第二个参数是压缩包里面的显示的名称, 可包含路径
  // 或是想打包整个目录 用 $zip->add_path($image_path);
}
//----------------------
$zip->output($dfile);
 
// 下载文件
ob_clean();
header('Pragma: public');
header('Last-Modified:'.gmdate('D, d M Y H:i:s') . 'GMT');
header('Cache-Control:no-store, no-cache, must-revalidate');
header('Cache-Control:pre-check=0, post-check=0, max-age=0');
header('Content-Transfer-Encoding:binary');
header('Content-Encoding:none');
header('Content-type:multipart/form-data');
header('Content-Disposition:attachment; filename="'.$filename.'"'); //设置下载的默认文件名
header('Content-length:'. filesize($dfile));
$fp = fopen($dfile, 'r');
while(connection_status() == 0 && $buf = @fread($fp, 8192)){
  echo $buf;
}
fclose($fp);
@unlink($dfile);
@flush();
@ob_flush();
exit();
?>

参考： http://www.jb51.net/article/107107.htm

下面的这个是没有成功的，但是也是可以用来下载别的文件的。都是学习嘛。

/*php多文件压缩并且下载*/
function addFileToZip($path,$zip){
        $handler=opendir($path); //打开当前文件夹由$path指定。
        while(($filename=readdir($handler))!==false){
            if($filename != "." && $filename != ".."){//文件夹文件名字为'.'和‘..’，不要对他们进行操作
                if(is_dir($path."/".$filename)){// 如果读取的某个对象是文件夹，则递归
                    addFileToZip($path."/".$filename, $zip);
                }else{
                    //将文件加入zip对象;并减少目录层
                    $zip->addFile($path.$filename, $filename);
                }
            }
        }
        @closedir($path);
    }
     
    //要下载的文件夹路径
    $filePath = '..'.$_GET['activepath']. '/'. $_GET['filename'].'/';
    //生成压缩文件名字
    $zipFileName = '../download/'.$_GET['filename'] .'.zip';
 
    $zip=new ZipArchive();
    if($zip->open($zipFileName, ZipArchive::OVERWRITE)=== TRUE){
        addFileToZip($filePath, $zip); //调用方法，对要打包的根目录进行操作，并将ZipArchive的对象传递给方法
        $zip->close(); //关闭处理的zip文件
    }
     
    if(!file_exists($zipFileName))
    {
        echo '文件压缩失败！或者未生成压缩包！！';
        exit;
    }
     
    header("Cache-Control: public");
    header("Content-Description: File Transfer");
    header('Content-disposition: attachment; filename='.basename($zipFileName)); //文件名
    header("Content-Type: application/zip"); //zip格式的
    header("Content-Transfer-Encoding: binary"); //告诉浏览器，这是二进制文件
    header('Content-Length: '. filesize($zipFileName)); //告诉浏览器，文件大小
    @readfile($zipFileName);

参考： http://www.cnblogs.com/Abner3721/p/5777115.html