Notice: Undefined index: temperature in C:\xampp\htdocs\1\dht.php on line 20 

웹에서 뜨는 텍스트이고 아래는 해당  PHP 소스코드입니다.

20번째 라인이 밑줄과 굵게 표시된 구문입니다.

뭐가 문제일까요?


 

class dht11{

 public $link='';

 function __construct($temperature, $humidity){

  $this->connect();

  $this->storeInDB($temperature, $humidity);

 }

 function connect(){

  $this->link = mysqli_connect('localhost','root','') or die('Cannot connect to the DB');

  mysqli_select_db($this->link,'') or die('Cannot select the DB');

 }

 function storeInDB($temperature, $humidity){

  $query = "insert into set humidity='".$humidity."', temperature='".$temperature."'";

  $result = mysqli_query($this->link,$query) or die('Errant query:  '.$query);

 }

}

{if($_GET['temperature'] != '' and  $_GET['humidity'] != '')

 $dht11=new dht11($_GET['temperature'],$_GET['humidity']);

}

?>