error_logic_chat

public function get_chat(){
		$chat=$this->input->get('chats');
		$user=$this->ion_auth->user()->row();
		if($chat==NULL || empty($chat) || $chat==''){
			$this->db->where('group_chat','xyxy');
			$this->db->order_by('waktu', 'ASC');
			$get=$this->db->get('chat');
			if($get->num_rows()>0){
				$data1=array();
				$data2=array();
				$data3=array();
				$data4=array();
				$data5=array();
				$no=1;
				foreach ($get->result() as $key) {
					$penentu='';
					if($key->pengirim!==$user->id){
						$penentu='left';
					}else{
						$penentu='right';
					}

					$data1[]=$key->chat;
					$data2[]=$penentu;
					$data3[]=$key->waktu;
					$data4[]=$key->pengirim;
					$data5[]=$key->penerima;
					$no++;
				}
				$data=array(
					'text'        => $data1,
					'position'    => $data2,
					'waktu'       => $data3,
					'id_pengirim' => $data4,
					'id_penerima' => $data5,
					'id_login'    => $user->id,
					'nama'        => $user->first_name
				);
				echo json_encode($data);
			}
		}else{
			date_default_timezone_set('Asia/jakarta');
			$user=$this->ion_auth->user()->row();
			$data=array(
				'waktu' => date('Y-m-d H:m:s'),
				'pengirim'   => $user->first_name=='Abi'? '3':'2',
				'penerima'   => $user->first_name=='Abi'? '2':'3',
				'chat'       => $chat,
				'group_chat' => 'xyxy'
			);
			$this->db->insert('chat', $data);

			$chat=$this->input->get('chats');
			$this->db->where('chat',$chat);
			$get=$this->db->get('chat');
			$dataa=array();
			foreach ($get->result() as $key) {
				$penentu='';
				if($key->pengirim==$user->id){
					$penentu='left';
				}else{
					$penentu='right';
				}
				$dataa['text']=$key->chat;
				$dataa['waktu']=$key->waktu;
				$dataa['position']= $penentu;
			}
			echo json_encode($dataa);
		}

	}