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header("Content-type: image/gif");

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ob_start(); 
@readfile($bilddatei_oder_url) or die("Fatal error: Couldn't get $bilddatei_oder_url.");
$img = ob_get_contents(); 
ob_end_clean(); 

$img_ex = explode('.', $url);		// get extension
$img_which = count($img_ex) - 1;
$img_ext = strtolower($img_ex[$img_which]);
if ($img_ext == 'gif') { $img_type = 'gif'; } elseif ($img_ext == 'jpg') { $img_type = 'jpeg'; } elseif ($img_ext == 'png') { $img_type = 'png'; } else { die("Couldn't determine image file type of [$img_ext]"); }

Header("Content-type: image/$img_type"); 
Header("Expires: Wed, 11 Nov 2001 11:11:11 GMT"); 
Header("Cache-Control: no-cache"); 
Header("Cache-Control: must-revalidate");

echo $img;