function filter(callable $cb) {
		$rowset = clone $this;
		$rowset->index = 0;
		$rowset->rows = array_filter($this->rows, $cb);
		return $rowset;
	}
function filter(callable $cb) {
		$rowset = clone $this;
		$rowset->index = 0;
		$rowset->rows = array_filter($this->rows, $cb);
		return $rowset;
	}
function filter ( callable $ cb ) { $ rowset = clone $ this ; $ rowset -> index = 0 ; $ rowset -> rows = array_filter ( $ this -> rows , $ cb ) ; return $ rowset ; }
Filter by callback
@param callable $cb
@return \pq\Gateway\Rowset
Filter by callback