PHP文件下载类

<?    //====================================================    //   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";      }    }    ?> 

header("Content-type:text/html;charset=utf-8");header("Pragma: public"); header("Expires: 0"); header("Cache-Control: must-revalidate, post-check=0, pre-check=0"); header("Cache-Control: private",false); header("Content-type: text/plain"); header("Content-Transfer-Encoding: binary"); header("Content-Length: ". filesize($path)); header('Content-Disposition: attachment; filename="100.jpg" ;'); 

<?if( empty($_GET['FileName'])|| empty($_GET['FileDir'])|| empty($_GET['FileId'])){echo'<script> alert("非法连接 !"); location.replace ("index.php") </script>'; exit();}$file_name=$_GET['FileName'];$file_dir=$_GET['FileDir'];$FileId=$_GET['FileId'];$file_dir = $file_dir."/";if   (!file_exists($file_dir.$file_name))   {   //检查文件是否存在  echo   "文件找不到";  exit;    }else{  $file = fopen($file_dir . $file_name,"r"); // 打开文件// 输入文件标签Header("Content-type: application/octet-stream");Header("Accept-Ranges: bytes");Header("Accept-Length: ".filesize($file_dir . $file_name));Header("Content-Disposition: attachment; filename=" . $file_name);// 输出文件内容echo fread($file,filesize($file_dir . $file_name));fclose($file);exit();}?>