I have a database structure with an one to many relationship. In the html form, there are similar inputs with a name 'item[]' or 'file[]' to make the data to be an array

```
<form action="submit.php" method="get">
  Name:<input type="text" name="name"/><br/>
  Item:<input type="text" name="item[]"/><br/>
  File:<input type="file" name="file[]" multiple/>
  Item:<input type="text" name="item[]"/><br/>
  File:<input type="file" name="file[]" multiple/>
  Select:<select name="select" value="1" original="1">
  <option value="1">One</option>
  <option value="2">Two</option>
  </select>

</form>

```

how can i submit only the changed field, and in the server side i can recongize which item is changed? I tried disable the inputs, but it seems not working.

another problem is that if i submit the form with ajax, how can i submit the files