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php将图片打包下载

碧羽墨轩 2019-01-22 17:01:56 130人围观
简介平时下载图片是单张图片,比较不高效。由于需要提供多图下载的功能,所以想到了多图打包压下载的思路,今天在这里跟大家分享如何实现这个功能。

    <?php
    /**
     * 图片打包下载
     */
    namespace app\common\extend;
    class Imagedown {
        var $datasec      = array ();
        var $ctrl_dir     = array ();
        var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
        var $old_offset   = 0;
        public function unix2_dostime($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) | ($timearray ['seconds'] >> 1);
        }
        public function add_file($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[] = $cdrec;
        }
        public function add_path($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));
              }
            }
        }
        public 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($data)) . "\x00\x00";
        }
        public function add_files($files){
            foreach($files as $file){
              if (is_file($file)){
                $data = implode("", file($file));
                $this->add_file($data, $file);
              }
            }
        }
        public function output($file){
            $fp = fopen($file, "w");
            fwrite($fp, $this->file ());
            fclose($fp);
        }
    }
    //以上是类文件 自己封装成一个类
    //打包下载实例操作过程
    $dfile = tempnam('/tmp', 'tmp');//产生一个临时文件,用于缓存下载文件
    $zip = new Imagedown();
    $image = array(
        'https://i.loli.net/2018/05/31/5b0f51c4715a7.jpg',
        'https://i.loli.net/2018/05/31/5b0f51e0b5f01.jpg'
    );
    //----------------------
    $filename = 'image.zip'; //下载的默认文件名
    foreach($image as $v){
      $zip->add_file(file_get_contents($v), basename($v));
      // 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();
    //打包下载实例操作过程

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