Description:
------------
I have a script which is supposed to insert a query into a database, and output the insert ID if the operation is successful. (It's a very simple piece of an AJAX framework.)

My MySQL handler is called $sql.

If I put:
die($sql->insert_id);

The output is empty. I expect the Insert ID to be outputted before the script ends.

This code works fine:
echo $sql->insert_id;
die();

Test script:
---------------
  $sql = new mysqli($db_host, $db_user, $db_pass, $db_name);
  if ($sql->connect_error) {
    die('Connect Error ('.$sql->connect_errno.') '.$sql->connect_error);
  }

  $day = $_REQUEST['day'];
  $content = $_REQUEST['content'];

  if ($day != "-1" && $day != "0" && $day < 1) {
    die("Invalid Day!");
  }
  
  if (strlen($content) < 10) {
    die("Content Too Short!");
  } else if (strlen($content) > 255) {
    die("Content Too Long!");
  }
  
  $query = "INSERT INTO task (name, day_id, type, last, time) VALUES ('".$sql->escape_string($content)."', ".($day-0).", 0, ".time().", ".time().");";
  //echo $query;
  if ($sql->query($query)) {
    //Return Item ID:
    die($sql->insert_id);
  } else {
    die("MySQL Error! ".$query." - ".$sql->error);
  }

Expected result:
----------------
Empty page. (No output.)

Actual result:
--------------
Insert ID for query. (ie 213.)