PHP文件下载类

复制代码代码如下:<？
//====================================================
//   使用范例：
// $download=new download（"php,exe,html",false）;
//  if（！$download->downloadfile（$filename））
//  {
//    echo $download->geterrormsg（）;
//  }
//====================================================
class download{
  var $debug=true;
  var $errormsg="";
  var $Filter=array（）;
  var $filename="";
  var $mineType="text/plain";
  var $xlq_filetype=array（）;

  function download（$fileFilter="",$isdebug=true）
  {
    $this->setFilter（$fileFilter）;
        $this->setdebug（$isdebug）;
        $this->setfiletype（）;
  }

  function setFilter（$fileFilter）
  {
    if（empty（$fileFilter）） return ;
        $this->Filter=explode（",",strtolower（$fileFilter））;
  }
  function setdebug（$debug）
  {
    $this->debug=$debug;
  }

  function setfilename（$filename）
  {
    $this->filename=$filename;
  }

  function downloadfile（$filename）
  {
    $this->setfilename（$filename）;
    if（$this->filecheck（））
        {
          $fn = array_pop（ explode（ "/", strtr（ $this->filename, "\", "/" ）））;
          header（ "Pragma: public" ）;
      header（ "Expires: 0" ）; // set expiration time
      header（ "Cache-Component: must-revalidate, post-check=0, pre-check=0" ）;
          header（ "Content-type:".$this->mineType ）;
      header（ "Content-Length: " . filesize（ $this->filename ））;
      header（ "Content-Disposition: attachment; filename="$fn"" ）;
      header（ "Content-Transfer-Encoding: binary" ）;
      readfile（ $this->filename ）;
      return true;
        }else
        {
        return false;
        }
  }
  function geterrormsg（）
  {
    return $this->errormsg;
  }

  function filecheck（）
  {
    $filename=$this->filename;
        if（file_exists（$filename））
        {
           $filetype=strtolower（array_pop（explode（".",$filename）））;
           if（in_array（$filetype,$this->Filter））
           {
             $this->errormsg.=$filename."不允许下载！";
                 if（$this->debug） exit（$filename."不允许下载！"） ;
                 return false;
           }else
           {
             if （ function_exists（ "mime_content_type" ））
                 {
           $this->mineType = mime_content_type（ $filename ）;
         }
                 if（empty（$this->mineType））
                 {
                    if（ isset（$this->xlq_filetype[$filetype]））  $this->mineType = $this->xlq_filetype[$filetype];
                 }
                 if（！empty（$this->mineType））
                   return true;
                 else
                 {
                    $this->errormsg.="获取".$filename."文件类型时候发生错误，或者不存在预定文件类型内";
                        if（$this->debug） exit（"获取文件类型出错"）;
                        return false;
                 }
           }
        }else
        {
          $this->errormsg.=$filename."不存在！";
          if（$this->debug） exit（$filename."不存在！"） ;
          return false;
        }
  }

  function setfiletype（）
  {
    $this->xlq_filetype["chm"]="application/octet-stream";
    $this->xlq_filetype["ppt"]="application/vnd.ms-powerpoint";
    $this->xlq_filetype["xls"]="application/vnd.ms-excel";
    $this->xlq_filetype["doc"]="application/msword";
    $this->xlq_filetype["exe"]="application/octet-stream";
    $this->xlq_filetype["rar"]="application/octet-stream";
    $this->xlq_filetype["js"]="javascript/js";
    $this->xlq_filetype["css"]="text/css";
    $this->xlq_filetype["hqx"]="application/mac-binhex40";
    $this->xlq_filetype["bin"]="application/octet-stream";
    $this->xlq_filetype["oda"]="application/oda";
    $this->xlq_filetype["pdf"]="application/pdf";
    $this->xlq_filetype["ai"]="application/postsrcipt";
    $this->xlq_filetype["eps"]="application/postsrcipt";
    $this->xlq_filetype["es"]="application/postsrcipt";
    $this->xlq_filetype["rtf"]="application/rtf";
    $this->xlq_filetype["mif"]="application/x-mif";
    $this->xlq_filetype["csh"]="application/x-csh";
    $this->xlq_filetype["dvi"]="application/x-dvi";
    $this->xlq_filetype["hdf"]="application/x-hdf";
    $this->xlq_filetype["nc"]="application/x-netcdf";
    $this->xlq_filetype["cdf"]="application/x-netcdf";
    $this->xlq_filetype["latex"]="application/x-latex";
    $this->xlq_filetype["ts"]="application/x-troll-ts";
    $this->xlq_filetype["src"]="application/x-wais-source";
    $this->xlq_filetype["zip"]="application/zip";
    $this->xlq_filetype["bcpio"]="application/x-bcpio";
    $this->xlq_filetype["cpio"]="application/x-cpio";
    $this->xlq_filetype["gtar"]="application/x-gtar";
    $this->xlq_filetype["shar"]="application/x-shar";
    $this->xlq_filetype["sv4cpio"]="application/x-sv4cpio";
    $this->xlq_filetype["sv4crc"]="application/x-sv4crc";
    $this->xlq_filetype["tar"]="application/x-tar";
    $this->xlq_filetype["ustar"]="application/x-ustar";
    $this->xlq_filetype["man"]="application/x-troff-man";
    $this->xlq_filetype["sh"]="application/x-sh";
    $this->xlq_filetype["tcl"]="application/x-tcl";
    $this->xlq_filetype["tex"]="application/x-tex";
    $this->xlq_filetype["texi"]="application/x-texinfo";
    $this->xlq_filetype["texinfo"]="application/x-texinfo";
    $this->xlq_filetype["t"]="application/x-troff";
    $this->xlq_filetype["tr"]="application/x-troff";
    $this->xlq_filetype["roff"]="application/x-troff";
    $this->xlq_filetype["shar"]="application/x-shar";
    $this->xlq_filetype["me"]="application/x-troll-me";
    $this->xlq_filetype["ts"]="application/x-troll-ts";
    $this->xlq_filetype["gif"]="image/gif";
    $this->xlq_filetype["jpeg"]="image/pjpeg";
    $this->xlq_filetype["jpg"]="image/pjpeg";
    $this->xlq_filetype["jpe"]="image/pjpeg";
    $this->xlq_filetype["ras"]="image/x-cmu-raster";
    $this->xlq_filetype["pbm"]="image/x-portable-bitmap";
    $this->xlq_filetype["ppm"]="image/x-portable-pixmap";
    $this->xlq_filetype["xbm"]="image/x-xbitmap";
    $this->xlq_filetype["xwd"]="image/x-xwindowdump";
    $this->xlq_filetype["ief"]="image/ief";
    $this->xlq_filetype["tif"]="image/tiff";
    $this->xlq_filetype["tiff"]="image/tiff";
    $this->xlq_filetype["pnm"]="image/x-portable-anymap";
    $this->xlq_filetype["pgm"]="image/x-portable-graymap";
    $this->xlq_filetype["rgb"]="image/x-rgb";
    $this->xlq_filetype["xpm"]="image/x-xpixmap";
    $this->xlq_filetype["txt"]="text/plain";
    $this->xlq_filetype["c"]="text/plain";
    $this->xlq_filetype["cc"]="text/plain";
    $this->xlq_filetype["h"]="text/plain";
    $this->xlq_filetype["html"]="text/html";
    $this->xlq_filetype["htm"]="text/html";
    $this->xlq_filetype["htl"]="text/html";
    $this->xlq_filetype["rtx"]="text/richtext";
    $this->xlq_filetype["etx"]="text/x-setext";
    $this->xlq_filetype["tsv"]="text/tab-separated-values";
    $this->xlq_filetype["mpeg"]="video/mpeg";
    $this->xlq_filetype["mpg"]="video/mpeg";
    $this->xlq_filetype["mpe"]="video/mpeg";
    $this->xlq_filetype["avi"]="video/x-msvideo";
    $this->xlq_filetype["qt"]="video/quicktime";
    $this->xlq_filetype["mov"]="video/quicktime";
    $this->xlq_filetype["moov"]="video/quicktime";
    $this->xlq_filetype["movie"]="video/x-sgi-movie";
    $this->xlq_filetype["au"]="audio/basic";
    $this->xlq_filetype["snd"]="audio/basic";
    $this->xlq_filetype["wav"]="audio/x-wav";
    $this->xlq_filetype["aif"]="audio/x-aiff";
    $this->xlq_filetype["aiff"]="audio/x-aiff";
    $this->xlq_filetype["aifc"]="audio/x-aiff";
    $this->xlq_filetype["swf"]="application/x-shockwave-flash";
  }
}
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