public function getBody() {
    $filename = $this->getFileName();
    $start_line = $this->getStartLine() - 1; // it's actually - 1, otherwise you wont get the function() block
    $end_line = $this->getEndLine();
    $length = $end_line - $start_line;
    $file_source = file($filename);
    $body = implode("", array_slice($file_source, $start_line, $length));

    return $body;
  }