public static function showThumbnail($file)
{
if (filemtime($file) < filemtime($_SERVER['SCRIPT_FILENAME'])) {
$mtime = gmdate('r', filemtime($_SERVER['SCRIPT_FILENAME']));
} else {
$mtime = gmdate('r', filemtime($file));
}
$etag = md5($mtime . $file);
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && $_SERVER['HTTP_IF_MODIFIED_SINCE'] == $mtime || isset($_SERVER['HTTP_IF_NONE_MATCH']) && str_replace('"', '', stripslashes($_SERVER['HTTP_IF_NONE_MATCH'])) == $etag) {
header('HTTP/1.1 304 Not Modified');
return;
} else {
header('ETag: "' . $etag . '"');
header('Last-Modified: ' . $mtime);
header('Content-Type: image/png');
$image = ImageServer::createThumbnail($file);
imagepng($image);
}
}
