PHP实现图片批量打包下载功能
author:一佰互联 2019-04-26   click:179

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 = "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();?>

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