Include file error, common one I think

[Chris Carter <chandan9sharma@xxxxxxxxx>]

Hi,

Here is code that I got from the internet for random image. This file works
perfect if I try it independently but not on any existing file. I think the
error that I am getting is quite common on the net but its new for me.

I am getting this error:

Warning: Cannot modify header information - headers already sent by (output
started at /folder/test.php:12) in /folder/randomimage.php on line 19

the code that I got from net:

<?
$folder = 'images/';
$exts = 'jpg jpeg png gif';
$files = array(); $i = -1; 
if ('' == $folder) $folder = './';
$handle = opendir($folder);
$exts = explode(' ', $exts);
while (false !== ($file = readdir($handle))) {
    foreach($exts as $ext) { 
        if (preg_match('/\.'.$ext.'$/i', $file, $test)) { 
            $files[] = $file; 
            ++$i;
            }
        }
    }
closedir($handle); 
mt_srand((double)microtime()*1000000);
$rand = mt_rand(0, $i);


Line 19 is below:

header('Location: '.$folder.$files[$rand]);
?>

Thanks a bunch.
Chris
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