php 文件直接下载

<?php
// header("Content-type: text/html; charset=utf-8"); 
class Admin_Page_Gongyi_Packzip{
  public $datasec = array ();
  public $ctrl_dir = array ();
  public $eof_ctrl_dir = "x50x4bx05x06x00x00x00x00";
  public $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){ 
    $name = urldecode($name);      
   //判断文件名中是否含有中文
   if (preg_match("/[x7f-xff]/", $name)) { 
    $name = $this->iconv_to_utf8($name,'GB2312');
   }
 
    $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);
  }

 /**
 * 转码为UTF-8
 * @param $keyword 要转码的字符串
 */
  function iconv_to_utf8($keyword, $to='UTF-8'){
      $encode = mb_detect_encoding($keyword, array('ASCII','UTF-8','GBK','GB2312'));
      if($encode != $to){
      $keyword = iconv($encode, $to, $keyword);
    }
    return $keyword;
  }

  public  function file_exists_img($url)
  {
      $curl = curl_init($url);
      // 不取回数据
      curl_setopt($curl, CURLOPT_NOBODY, true);
      // 发送请求
      $result = curl_exec($curl);
      // 如果请求没有发送失败
      if ($result !== false) {
        return true;
      }
      return false;
  }

  /**
   * [create description]
   * @param  [type] $arr     [图片地址]
   * @param  [type] $name    [最后压缩后的文件名]
   * @param  [type] $content [导出文件的内容]
   * @return [type]          [直接下载]
   */
  public function create($arr,$name,$content){
    //打包文件
    $name=time()+rand(1000,9999);
    //用户打包文档
    $filetxt=time()+rand(1000,9999).rand(1000,9000).'txt';
    $dfile = tempnam('/tmp', $name);//产生一个临时文件，用于缓存下载文件
    $dfiletxt = tempnam('/tmp', $filetxt);//txt文件
    if($dfiletxt){
      file_put_contents($dfiletxt,$content);      
    }
    $zip = new Admin_Page_Gongyi_Packzip();
    $zip->add_file(file_get_contents($dfiletxt), $name.'.txt');
    $filename = date('Y-m-d').$name.'.zip'; //下载的默认文件名
    foreach($arr as $v){
      if($zip->file_exists_img($v['image_src'])){
        $zip->add_file(file_get_contents($v['image_src']), $v['image_name']);
      }

    }
    //----------------------
    $zip->output($dfile);
    // 下载文件
    ob_clean();
    header('pragma:public');  
    header('Cache-Control: max-age=0');
    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($dfile);
    @unlink($dfiletxt);
    @flush();
    @ob_flush();
    exit();
  }
}


?>