function check_image_name($name)
{
$allowed = array("jpg", "jpeg", "png", "gif");
$extension = Util::getFileExtension($name);
if (!empty($extension)) {
$extension = strtolower($extension);
}
if (empty($extension) || !in_array($extension, $allowed)) {
$message = sprintf("error uploading %s : only JPG, JPEG, GIF, or PNG allowed", $name);
$data = array("code" => 500, "error" => $message);
echo json_encode($data);
exit;
}
}