public function swap()
    {
        $compare1 = $this->compare1;

        $this->compare1 = $this->compare2;

        $this->compare2 = $compare1;

        return $this;
    }
public function swap()
    {
        $compare1 = $this->compare1;

        $this->compare1 = $this->compare2;

        $this->compare2 = $compare1;

        return $this;
    }
public function swap ( ) { $ compare1 = $ this -> compare1 ; $ this -> compare1 = $ this -> compare2 ; $ this -> compare2 = $ compare1 ; return $ this ; }
Swap compares.

@return  Compare  Return self to support chaining.
Swap compares .