/**
* You can pass it new Section("My title") or new Section("my_id", "My Title");
* So you give it a unique ID and a title to refer to it by.
*
* @param string $id_or_title
* @param string $title
*/
public function __construct($id_or_title, $title = null)
{
$id = $id_or_title;
$this->_id = $this->_generateSafeID($id);
$this->title = $title !== null ? $title : $id_or_title;
SectionManager::registerSection($this);
}