function show_subscription_checkBox ($id='0') {
    global $sg_subscribe;
    sg_subscribe_start();

    if ( $sg_subscribe->checkBox_shown ) return $id;
    if ( !$email = $sg_subscribe->current_viewer_subscription_status() ) :
        $checked_status = ( !empty($_COOKIE['subscribe_checkBox_'.COOKIEHASH]) && 'checked' == $_COOKIE['subscribe_checkBox_'.COOKIEHASH] ) ? true : false;
    ?>   
<p <?PHP if ($sg_subscribe->clear_both) echo 'style="clear: both;" '; ?>class="subscribe-to-comments">
        <input type="checkBox" name="subscribe" id="subscribe" value="subscribe" style="width: auto;" <?PHP if ( $checked_status ) echo 'checked="checked" '; ?>/>

        <label for="subscribe"><?PHP echo $sg_subscribe->not_subscribed_text; ?></label>
        </p>

这是一个wordpress插件,允许您订阅博客评论.

我试过了

echo 'checked=\"checked\" ';
echo 'checked="checked" ' ;
echo 'checked> ';

该插件作者声明您曾经能够默认选中复选框但不再查看.