protected function filter()
    {
        $filter = null;

        if (   (!$filter = $this->is("classFilter"))
            && (!$filter = $this->is("idFilter"))
            && (!$filter = $this->is("attrFilter"))
            && (!$filter = $this->is("pseudoFilter"))
        ) {
            return false;
        }
        return $filter;
    }
protected function filter()
    {
        $filter = null;

        if (   (!$filter = $this->is("classFilter"))
            && (!$filter = $this->is("idFilter"))
            && (!$filter = $this->is("attrFilter"))
            && (!$filter = $this->is("pseudoFilter"))
        ) {
            return false;
        }
        return $filter;
    }
protected function filter ( ) { $ filter = null ; if ( ( ! $ filter = $ this -> is ( "classFilter" ) ) && ( ! $ filter = $ this -> is ( "idFilter" ) ) && ( ! $ filter = $ this -> is ( "attrFilter" ) ) && ( ! $ filter = $ this -> is ( "pseudoFilter" ) ) ) { return false ; } return $ filter ; }
Is the next thing a filter?

@return false|CssParserFilter
Is the next thing a filter?