public function valueKeys()
    {
        if (!$this->isValid()) {
            throw new \LogicException('Session is in an invalid state.');
        }

        return array_values(
                array_filter(
                        $this->storage->valueKeys(),
                        function($valueKey)
                        {
                            return substr($valueKey, 0, 11) !== '__stubbles_';
                        }
                )
        );
    }
public function valueKeys()
    {
        if (!$this->isValid()) {
            throw new \LogicException('Session is in an invalid state.');
        }

        return array_values(
                array_filter(
                        $this->storage->valueKeys(),
                        function($valueKey)
                        {
                            return substr($valueKey, 0, 11) !== '__stubbles_';
                        }
                )
        );
    }
public function valueKeys ( ) { if ( ! $ this -> isValid ( ) ) { throw new \ LogicException ( 'Session is in an invalid state.' ) ; } return array_values ( array_filter ( $ this -> storage -> valueKeys ( ) , function ( $ valueKey ) { return substr ( $ valueKey , 0 , 11 ) !== '__stubbles_' ; } ) ) ; }
return an array of all keys registered in this session

@return  string[]
@throws  \LogicException
return an array of all keys registered in this session