Description:
------------
While exif_thumbnail function works its practical use seems limited.

Using php 4.3.4 and the latest apache 2.0 build (5/04) the thumbnail of an image will not be
displayed correctly unless some unknown circumstance exists.  For example:  if you use the
script:

<?php
 $image = exif_thumbnail('griffon1.jpg');
  header("Content-type: image/jpeg");
  echo $image;
?>

This will work however, if you use this following script (1 php file):

<?php
// test
?>

<?php
 $image = exif_thumbnail('griffon1.jpg');
 header("Content-type: image/jpeg");
 echo $image;
?>

You will receive this error: 
Warning: Cannot modify header information - headers already sent by (output started at
C:\apache\Apache2\htdocs\index2.php:5) in C:\apache\Apache2\htdocs\index2.php on line 7

followed by raw image data, not the image itself.

I have also tried using ob_start and ob_flush at the
beginning and ending of the page.. .this will remove the warning, but you will not see the image, only the raw image data.

Reproduce code:
---------------
<?php
// test
?>

<?php
 $image = exif_thumbnail('griffon1.jpg');
 header("Content-type: image/jpeg");
 echo $image;
?>

Expected result:
----------------
Viewing the thumbnail of an image.

Actual result:
--------------
Raw image data output, no picture.