public function nextXY()
    {
        if (($this->keyY()+1)<=$this->countY()) {
            $this->seekY($this->keyY()+1);
        } else {
            if (($this->keyX()+1)<=$this->countX()) {
                $this->rewindY();
                $this->seekX($this->keyX()+1);
            } else {
                $this->x = null;
                $this->y = null;
            }
        }
        return $this;
    }
public function nextXY()
    {
        if (($this->keyY()+1)<=$this->countY()) {
            $this->seekY($this->keyY()+1);
        } else {
            if (($this->keyX()+1)<=$this->countX()) {
                $this->rewindY();
                $this->seekX($this->keyX()+1);
            } else {
                $this->x = null;
                $this->y = null;
            }
        }
        return $this;
    }
public function nextXY ( ) { if ( ( $ this -> keyY ( ) + 1 ) <= $ this -> countY ( ) ) { $ this -> seekY ( $ this -> keyY ( ) + 1 ) ; } else { if ( ( $ this -> keyX ( ) + 1 ) <= $ this -> countX ( ) ) { $ this -> rewindY ( ) ; $ this -> seekX ( $ this -> keyX ( ) + 1 ) ; } else { $ this -> x = null ; $ this -> y = null ; } } return $ this ; }
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@return  $this
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