PHP实现图片批量打包下载功能

上次遇到一个需要打包下载批量图片的问题，找了一下发现这个好方法，记录一下。

首先新建一个zipfile打包类：

    <?php
    class zipfile {
      var $datasec = array ();
      var $ctrl_dir = array ();
      var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
      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 = "\x50\x4b\x03\x04";
        $fr .= "\x14\x00";
        $fr .= "\x00\x00";
        $fr .= "\x08\x00";
        $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 = "\x50\x4b\x01\x02";
        $cdrec .= "\x00\x00";
        $cdrec .= "\x14\x00";
        $cdrec .= "\x00\x00";
        $cdrec .= "\x08\x00";
        $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)) . "\x00\x00";
      }

      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();
    ?>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。