The value of spinner inside table cannot be got by $_POST

The value of spinner inside table cannot be got by $_POST

I am using jquery-ui with spinner.

I found that the value of spinner inside table cannot be got by $_POST.

<table>
<input id="spinner" name="spinner" value="5">
......
......
......
</table>

In this situation, spinner is discarded.

Would anyone try this and solve the problem?