merge array with concate select to json

laravel, json

 $data = [];
        //ambil alamat asli customer
        $customer = DB::table('m_customer')->select(DB::raw("CONCAT(m_customer.main_address,' - ',m_kelurahan_desa.name,' - ',m_kecamatan.name,' - ',m_kota_kab.type,' ',m_kota_kab.name) as address"))
                    ->join('m_kelurahan_desa','m_kelurahan_desa.id','=','m_customer.main_kelurahan')
                    ->join('m_kecamatan','m_kecamatan.id','=','m_kelurahan_desa.kecamatan')
                    ->join('m_kota_kab','m_kota_kab.id','=','m_kecamatan.kota_kab')
                    ->where('m_customer.id',$customerID)
                    ->get();    

        //mencari alamat lainnya customer di m_alamat_customer    
        $otherAddress = DB::table('m_alamat_customer')->select(DB::raw("CONCAT(m_alamat_customer.address,' - ',m_kelurahan_desa.name,' - ',m_kecamatan.name,' - ',m_kota_kab.type,' ',m_kota_kab.name) as address"))
                        ->join('m_kelurahan_desa','m_kelurahan_desa.id','=','m_alamat_customer.kelurahan')
                        ->join('m_kecamatan','m_kecamatan.id','=','m_kelurahan_desa.kecamatan')
                        ->join('m_kota_kab','m_kota_kab.id','=','m_kecamatan.kota_kab')
                        ->where('m_alamat_customer.customer',$customerID)
                        ->get();
        //merge array
        $data = array_merge($customer->toArray(),$otherAddress->toArray());
        return Response::json($data);