Display image stored in SQLite3 via PHP Script

I have got an SQLite3 Database with several image开发者_如何学编程s in it. I want to display these Images in a Browser (Images are fetched from DB via PHP Script).

header('Content-type: image/jpeg');
$img=$this->getImgData($mid);
//next line is just for testing purposes
file_put_contents("/tmp/thumb.jpg", $img); 
echo $img;
exit();

The Problem is: The Image /tmp/thumb.jpg can be viewed by any image Viewer, but the browser calling this php script (which gets the exact same data as in /tmp/thumb.jpg) refuses to display it. How could that be?

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Make sure not to have any characters written before this section

Most of the time there are spaces before a <?php, or in an include file somewhere above.

Doublecheck that!

Other than that everything look fine. IMO it should work.

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Found the Problem: I copied the content type from a webpage to my IDE.

header('Content-type: image/jpeg');

It seems like the "space" between "Content-type:" and "image/jpeg" wasn't a space but rather any other invisible unicode char. So i just keyed in the header by hand - and it worked!