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();

									?>