public function getCategories()
    {
        if (!isset($this->_messages)) {
            $this->loadAll();
        }
        $categories = array_keys($this->_messages);
        sort($categories);
        return $categories;
    }
public function getCategories()
    {
        if (!isset($this->_messages)) {
            $this->loadAll();
        }
        $categories = array_keys($this->_messages);
        sort($categories);
        return $categories;
    }
public function getCategories ( ) { if ( ! isset ( $ this -> _messages ) ) { $ this -> loadAll ( ) ; } $ categories = array_keys ( $ this -> _messages ) ; sort ( $ categories ) ; return $ categories ; }
Get all categories list
@return string[]
Get all categories list