title: Confirm form resubmission behaviour on refresh while using POST
body: <p>In case of POST method,parameters are not stored in the Browser History.
  Then on form resubmission how the previous/redundant data is again inserted to the database?</p>
  
  <pre><code>if(isset($_POST['submit']))
  {
  if($request_method=='POST')
  {
  $eventtype=$_POST['event-type'];
  $eventname=$_POST['eventname'];
  $teamA=$_POST['A-team'];
  $teamB=$_POST['B-team'];
  $gender=$_POST['gender'];
  $s=$_POST['date'];
  
  $time=date("Y-m-d H:i:s",strtotime($s));
  $matchtype=$_POST['match-type'];
  $venue=$_POST['venue'];
  
  $query= "INSERT INTO `fixtures` (`eventname`,`event-type`,`A-team`,`B-team`,`Gender`,`time`,`match-type`,`venue`) VALUES ('$eventname','$eventtype','$teamA','$teamB','$gender','$time','$matchtype','$venue');";
  $res = mysqli_query($connection,$query);
  if($res)
      echo 'inserted';
      else
          echo 'not inserted';
  mysqli_close($connection);
  
  }
  }
  </code></pre>