* 图片打包下载*/namespace app\common\extend;classImagedown {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

$zip = newImagedown();$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