Keep radio button selected after a form submit

问题

I am using below code to keep the radio button selection after a form submission, but it keep resetting to the last button after form submission

<input type="radio" name="button" value="Yes" <?php if(isset($_POST['button']) == 'Yes')  echo ' checked="checked"';?> />Yes
<input type="radio" name="button" value="No" <?php if(isset($_POST['button']) == 'No')  echo ' checked="checked"';?> />No

How can I keep the selection ?

回答1:

isset() returns a boolean. As such, comparing directly to Yes/No is not what you want.

What you want is:

if (isset($_POST['button']) && $_POST['button'] == 'Yes')

来源：https://stackoverflow.com/questions/18450998/keep-radio-button-selected-after-a-form-submit