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：

<?phpclass 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();?>