public function addOrderBy(string ...$expression) : self
    {
        $this->orderBy = array_merge($this->orderBy, $expression);

        return $this;
    }
public function addOrderBy(string ...$expression) : self
    {
        $this->orderBy = array_merge($this->orderBy, $expression);

        return $this;
    }
public function addOrderBy ( string ... $ expression ) : self { $ this -> orderBy = array_merge ( $ this -> orderBy , $ expression ) ; return $ this ; }
Adds to a "ORDER BY" clause

@param string[] $expression,... A variable list of expressions to order by
@return self For method chaining
Adds to a ORDER BY clause