How to delete data from mysql database in PHP

include_once("connection/conn.php");

if(isset($_POST['submit'])){
     $delete="DELETE FROM users WHERE user_id='".$_GET['user_id']."'";
     $result=mysqli_query($conn,$delete);
     if($result>0){
         echo "Data deleted successfully";
     } else {
         echo "Data not deleted";
     }
}