How to convert object array into string, PHP

Using $results->created_by = $data->query->results->created_by;

below is what $results returns

cctesttestfolderRequestSubData Object ( [created_by] => cctesttestfolderRequestSubData Object ( [0] => nick ) )

How do I convert above $results into below?

cctesttestfolderRequestSubData Object ( [created_by] => nick )

How do I remove cctesttestfolderRequestSubData Object

I have tried $results->created_by = changeArrayToString($data->query->results->created_by); But still the same.

Please assist, Thanks.