PHP File request/download script encoding as text/html - php

Question

I'm having an issue with this file download script. It takes in an ID, queries the filename, finds the extension, and sets the appropriate headers based on MIME type.
The issue is I THINK the header is being set to text/html instead of application/PDF in this case. It was working previously and now not so much. I've tried a simple force download script (http://webdesign.about.com/od/php/ht/force_download.htm) and that does work. Does anyone why this is happening?
Here is the code I'm using. (NOTE: This code was inherited. Just trying to fix this issue.)
<?php
include("includes/function_lib.php");
//*******************************************************************************//
//*******************************************************************************//
// Download Code
function output_file($file, $name, $mime_type='')
{
/*This function takes a path to a file to output ($file),
the filename that the browser will see ($name) and
the MIME type of the file ($mime_type, optional).
If you want to do something on download abort/finish,
register_shutdown_function('function_name');
*/
if(!is_readable($file)) die('File not found or inaccessible!');
$size = filesize($file);
$name = rawurldecode($name);
/* Figure out the MIME type (if not specified) */
$known_mime_types=array(
"pdf" => "application/pdf",
"sql" => "text/plain",
"txt" => "text/plain",
"html" => "text/html",
"htm" => "text/html",
"exe" => "application/octet-stream",
"zip" => "application/zip",
"doc" => "application/msword",
"xls" => "application/vnd.ms-excel",
"ppt" => "application/vnd.ms-powerpoint",
"gif" => "image/gif",
"png" => "image/png",
"jpeg"=> "image/jpg",
"jpg" => "image/jpg",
"php" => "text/plain"
);
if($mime_type=='')
{
$file_extension = strtolower(substr(strrchr($file,"."),1));
if(array_key_exists($file_extension, $known_mime_types))
{
$mime_type=$known_mime_types[$file_extension];
}
else
{
$mime_type="application/force-download";
}
}
#ob_end_clean(); //turn off output buffering to decrease cpu usage
// required for IE, otherwise Content-Disposition may be ignored
if(ini_get('zlib.output_compression'))
ini_set('zlib.output_compression', 'Off');
header('Content-Type: ' . $mime_type);
header('Content-Disposition: attachment; filename="'.$name.'"');
header("Content-Transfer-Encoding: binary");
header('Accept-Ranges: bytes');
/* The three lines below basically make the
download non-cacheable */
header("Cache-control: private");
header('Pragma: private');
header("Expires: Mon, 5 Jun 2019 05:00:00 GMT");
// multipart-download and download resuming support
if(isset($_SERVER['HTTP_RANGE']))
{
list($a, $range) = explode("=",$_SERVER['HTTP_RANGE'],2);
list($range) = explode(",",$range,2);
list($range, $range_end) = explode("-", $range);
$range=intval($range);
if(!$range_end) {
$range_end=$size-1;
} else {
$range_end=intval($range_end);
}
$new_length = $range_end-$range+1;
header("HTTP/1.1 206 Partial Content");
header("Content-Length: $new_length");
header("Content-Range: bytes $range-$range_end/$size");
} else {
$new_length=$size;
header("Content-Length: ".$size);
}
/* output the file itself */
$chunksize = 3*(1024*1024); //you may want to change this
$bytes_send = 0;
if ($file = fopen($file, 'r'))
{
if(isset($_SERVER['HTTP_RANGE']))
fseek($file, $range);
while(!feof($file) &&
(!connection_aborted()) &&
($bytes_send<$new_length)
)
{
$buffer = fread($file, $chunksize);
print($buffer); //echo($buffer); // is also possible
flush();
$bytes_send += strlen($buffer);
}
fclose($file);
} else die('Error - can not open file.');
die();
}
$data_action = $_REQUEST['action'];
if($data_action == 'downloadfile') {
if(isset($_REQUEST['file'])) {
$file = $_REQUEST['file'];
} else {
$Id = $_REQUEST["id"];
$sqlNewsletter = "select case_file from tbl_case where case_id=$Id and deleteflag='active' and status='active'";
$rsNewsletter = mysql_query($sqlNewsletter);
if(mysql_num_rows($rsNewsletter) > 0) {
$rowNewsletter = mysql_fetch_object($rsNewsletter);
$file = $rowNewsletter->case_file;
}
}
$filename = explode('/', $file);
$name = $filename[2];
//$name = $file;
$result = output_file($file, $file);
//}
?>
<?php
//$result = $s->output_file($file, $name);
//$s->pageLocation("index.php?pagename=database_backup&action=done&result=$result");
}
?>