<div class="same_cat_posts">
    <h3>亲，意犹未尽？来看更多：</h3>
<ul class="same_cat_posts_ul">
<?php
$post_num = 5; // 數量設定.
$exclude_id = $post->ID; // 單獨使用要開此行 //zww: edit
$posttags = get_the_tags(); $i = 0;
if ( $posttags ) {
    $tags = ''; foreach ( $posttags as $tag ) $tags .= $tag->term_id . ','; //zww: edit
    $args = array(
        'post_status' => 'publish',
        'tag__in' => explode(',', $tags), // 只選 tags 的文章. //zww: edit
        'post__not_in' => explode(',', $exclude_id), // 排除已出現過的文章.
        'caller_get_posts' => 1,
        'orderby' => 'comment_date', // 依評論日期排序.
        'posts_per_page' => $post_num
    );
    query_posts($args);
    while( have_posts() ) { the_post();//edit by Jeff at DeveWork.com
        $thumbnail = wp_get_attachment_image_src(get_post_thumbnail_id(), 'large');?>
    <li>
         <?php if ( has_post_thumbnail() ) { ?><a class="same_cat_posts_img" href="<?php the_permalink() ?>" title="<?php the_title(); ?>">
         <img src="<?php echo $thumbnail[0]; ?>" alt="<?php the_title(); ?>" /></a>
         <?php } else { ?>
    <a class="same_cat_posts_img" href="<?php the_permalink() ?>" title="<?php the_title(); ?>">
    <img src="<?php bloginfo('template_directory'); ?>/timthumb.php?src=<?php echo post_thumbnail_src(); ?>&h=114&w=114&zc=1" alt="<?php the_title(); ?>" 
    class="thumbnail"/></a>
         <?php } ?>
         <p class="same_cat_posts_tittle"><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>">
    <?php the_title(); ?></a></p>
    </li>
 
    <?php
        $exclude_id .= ',' . $post->ID; $i ++;
    } wp_reset_query();
}
if ( $i < $post_num ) { // 當 tags 文章數量不足, 再取 category 補足.
    $cats = ''; foreach ( get_the_category() as $cat ) $cats .= $cat->cat_ID . ',';
    $args = array(
        'category__in' => explode(',', $cats), // 只選 category 的文章.
        'post__not_in' => explode(',', $exclude_id),
        'caller_get_posts' => 1,
        'orderby' => 'comment_date',
        'posts_per_page' => $post_num - $i
    );
    query_posts($args);
    while( have_posts() ) { the_post(); //edit by Jeff at DeveWork.com
     $thumbnail = wp_get_attachment_image_src(get_post_thumbnail_id(), 'large');?>
     <li>
    <?php if ( has_post_thumbnail() ) { ?><a class="same_cat_posts_img" href="<?php the_permalink() ?>" title="<?php the_title(); ?>">
    <img src="<?php echo $thumbnail[0]; ?>" alt="<?php the_title(); ?>" /></a>
    <?php } else { ?>
    <a class="same_cat_posts_img" href="<?php the_permalink() ?>" title="<?php the_title(); ?>">
    <img src="<?php bloginfo('template_directory'); ?>/timthumb.php?src=<?php echo post_thumbnail_src(); ?>&h=114&w=114&zc=1" alt="<?php the_title(); ?>" 
    class="thumbnail"/></a>
    <?php } ?>
         <p class="same_cat_posts_tittle"><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>">
    <?php the_title(); ?></a></p>
    </li>
    <?php $i++;
    } wp_reset_query();
}
if ( $i  == 0 )  echo '<li>没有相关文章!</li>';
?>
</ul>
</div>