php achieve download

? <PHP 
header ( "Content-of the type: text / HTML; charset = UTF-8"); 
$ file_name = "1.text"; 
// solve Chinese problems can not be displayed 
$ file_name = iconv ( "utf- 8" , "GB2312", $ file_name); 
$ path1 = $ _ SERVER [ 'DOCUMENT_ROOT'];
. $ filepath = $ path1 $ file_name; 
whether // Analyzing file exists
(! the file_exists ($ file_path) iF) { 
echo "the file is not file "; 
return; 
} 
$ fp = fopen ($ filepath," r "); 
$ FILE_SIZE = filesize ($ filepath); 
// download file need to use the head 
header (" Content-type: application / octet-stream " ); 
Header ( "the Accept-Ranges: bytes"); 
Header ( "the Accept-the Length:" $ FILE_SIZE);. 
Header ( "the Content-Disposition: Attachment; filename =" $ file_name);. 
Buffer = 1024 $; 
$ FILE_COUNT = 0; 
// returns the data to the browser 
while(!feof($fp) && $file_count<$file_size){ 
$file_con=fread($fp,$buffer); 
$file_count+=$buffer; 
echo $file_con; 
} 
fclose($fp); 
?>