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(); ?>

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