public function addFilter(FilterInterface $filter) : Reader
    {
        foreach ($this->parsers as $parser) {
            $parser->addFilter($filter);
        }

        return $this;
    }
public function addFilter(FilterInterface $filter) : Reader
    {
        foreach ($this->parsers as $parser) {
            $parser->addFilter($filter);
        }

        return $this;
    }
public function addFilter ( FilterInterface $ filter ) : Reader { foreach ( $ this -> parsers as $ parser ) { $ parser -> addFilter ( $ filter ) ; } return $ this ; }
adds a filter to every parsers

@param \FeedIo\FilterInterface $filter
@return Reader
adds a filter to every parsers