public function setOptions($key, $value)
    {
        if (isset($this->options[ $key ]))
            $this->options[ $key ] = $value;

        return $this;
    }
public function setOptions($key, $value)
    {
        if (isset($this->options[ $key ]))
            $this->options[ $key ] = $value;

        return $this;
    }
public function setOptions ( $ key , $ value ) { if ( isset ( $ this -> options [ $ key ] ) ) $ this -> options [ $ key ] = $ value ; return $ this ; }
change value of preserved configuration

@param string $key  key of option you want to change
@param mixed $value value of option you want to change

@return $this current object
change value of preserved configuration