我有这两个代码。当我提交表单时,它始终默认为选中否
<td><input type="radio" onclick="selbustbl(1)" name="rdo2" id="busyes" value="yes" <? if(isset($_POST['rdo2']) == 'yes') echo " checked"; ?> />Yes</td>
<td><input type="radio" onclick="selbustbl(2)" name="rdo2" id="busno" value="no" <? if(isset($_POST['rdo2']) == 'no') echo "checked"; ?> />No</td>
请帮忙