/**
  * Get a string in uppercase
  *
  * @param string $value The string to transform
  * @param bool $return Return/Echo flag (default is to echo result)
  * @return mixed The result of the `_echo` function (string or bool)
  * @see _echo()
  */
 function _upper($value, $return = false)
 {
     return _echo(strtoupper(TemplateEngine::__string($value)), $return);
 }