public function set($key, $value) {
        $this->open();

        $this->_data[$key] = $value;

        return $this;
    }
public function set($key, $value) {
        $this->open();

        $this->_data[$key] = $value;

        return $this;
    }
public function set ( $ key , $ value ) { $ this -> open ( ) ; $ this -> _data [ $ key ] = $ value ; return $ this ; }
Set a variable in the session array.

$session->set('foo', 'bar');

@param   string $key variable name
@param   mixed $value value
@return  $this
Set a variable in the session array .