PHP大文件下载

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{      

         //Big File

         $file
= $identity
. ".cleanpdb.tar.gz";

         $path
= $webdatapath
. "seq/" . $file;

         if(!file_exists($path))

         {

                 echo
"Sorry" . ‘<br>‘;

                 echo
$file . " not exist";

                 return
false;

         }

         header("Content-type: "."application/gz");

         header(‘Content-Disposition: attachment; filename="‘.basename($path));

         header("Cache-control: public");

         header("Pragma: public");

         header("Content-Length: ".filesize($path));

         ob_end_clean();

         $fp
= fopen($path,‘r‘);

         $file_size
= filesize($path);

         $buffer=1024;

         $cur_size=0;

         while(!feof($fp) && $file_size>$buffer+$cur_size) {

                 $file_data
= fread($fp, $buffer);

                 echo
$file_data;

                 $cur_size
+= $buffer;

         }

         $file_data
= fread($fp, $file_size-$cur_size);

         echo
$file_data;

         fclose($fp);

 }