codeigniter query in array

I have tried a few different approaches to this problem with no solutions so far. I am receiving error message:

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The array you try to pass is a multi dimensional array. Instead try this: $ids = array(); foreach ($query->result_array() as $id) { $ids[] = $id['id']; } $this->db->where_in('id', $ids); codeigniter function Example for where in array query:- function getMultiCast($religion_id) { $this->db->where_in("religion_id", $religion_id); $query = $this->db->get("castlist"); return $query->result(); }