php - typecho怎么做日期归档文章循环？

根据年份来循环出归档：

<?php $this->widget('Widget_Contents_Post_Recent', 'pageSize=10000')->to($archives);
    $year=0; $mon=0; $i=0; $j=0;
    while($archives->next()):
    $year_tmp = date('Y',$archives->created);
    $mon_tmp = date('m',$archives->created);
    $y=$year; $m=$mon;
    if ($mon != $mon_tmp && $mon > 0) $output .= '</ul></li>';
    if ($year != $year_tmp && $year > 0) $output .= '</ul>';
    if ($year != $year_tmp) {
        $year = $year_tmp;
    }
    if ($mon != $mon_tmp) {
        $mon = $mon_tmp;
        $output .= '<h3>'. $year .' 年'. $mon .' 月</h3>';
        $output .= '<ul>';
    }
    $output .= '<li><a href="'.$archives->permalink .'">'. $archives->title .'</a>&nbsp;&nbsp;&nbsp;&nbsp;('.date('M j, Y',$archives->created).')</li>';
    endwhile;
    $output .= '</ul>';
    echo $output;
?>

循环是循环啦 貌似没输出啊... echo 出来吧 骚年