function output_random_posts($limitclause)
{
            $related_posts = wp_get_random_posts($limitclause);
foreach ($related_posts as $related_post )
    {
        $output .= '<li>';

        $dateformat = get_option('date_format');
        $output .= mysql2date($dateformat, $related_post->post_date) . "  //  ";

        $output .=  '<a href="'.get_permalink($related_post->ID).'" title="'.wptexturize($related_post->post_title).'">'.wptexturize($related_post->post_title).'</a>';

        $output .=  " (" . $related_post->comment_count . ")";

    $output .=  '</li>';
    }
    $output = '<h3>随机日志</h3><ul class="related_post">' . $output . '</ul>';
echo $output;
}

//调用 ：
output_random_posts(‘LIMIT 10’);