WordPress 相关文章缩略图及标题列表

WORDPRESS 相关文章缩略图

在function.php中添加如下代码:

//添加缩略图支持
if ( function_exists('add_theme_support') )add_theme_support('post-thumbnails'); 
//输出缩略图地址
function post_thumbnail_src(){
    global $post;
	if( $values = get_post_custom_values("thumb") ) {	//输出自定义域图片地址
		$values = get_post_custom_values("thumb");
		$post_thumbnail_src = $values [0];
	} elseif( has_post_thumbnail() ){    //如果发布文章时手动设置了特色图像,则优先输出它
        $thumbnail_src = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID),'full');
		$post_thumbnail_src = $thumbnail_src [0];
    } else {
		$post_thumbnail_src = '';
		ob_start();
		ob_end_clean();
		$output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);
		$post_thumbnail_src = $matches [1] [0];   //获取图片链接
		if(empty($post_thumbnail_src)){	//如果文章中没有图片,则显示随机图片
			$random = mt_rand(1, 10);
			echo get_bloginfo('template_url');
			echo '/images/pic/'.$random.'.jpg';
			//如果文章中没有图片,则显示默认图片
			//echo '/images/default_thumb.jpg';
		}
	};
	echo $post_thumbnail_src;
}

最后在需要调用的地方添加如下代码:

<h3>相关文章</h3>
<ul class="related_img">
<?php
$post_num = 4;
$exclude_id = $post->ID;
$posttags = get_the_tags(); $i = 0;
if ( $posttags ) {
	$tags = ''; foreach ( $posttags as $tag ) $tags .= $tag->term_id . ',';
	$args = array(
		'post_status' => 'publish',
		'tag__in' => explode(',', $tags),
		'post__not_in' => explode(',', $exclude_id),
		'caller_get_posts' => 1,
		'orderby' => 'comment_date',
		'posts_per_page' => $post_num
	);
	query_posts($args);
	while( have_posts() ) { the_post(); ?>
		<li class="related_box"  >
		<div class="r_pic">
		<a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>" target="_blank">
		<img src="<?php echo post_thumbnail_src(); ?>" alt="<?php the_title(); ?>" class="thumbnail" />
		</a>
		</div>
		<div class="r_title"><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>" target="_blank" rel="bookmark"><?php the_title(); ?></a></div>
		</li>
	<?php
		$exclude_id .= ',' . $post->ID; $i ++;
	} wp_reset_query();
}
if ( $i < $post_num ) {
	$cats = ''; foreach ( get_the_category() as $cat ) $cats .= $cat->cat_ID . ',';
	$args = array(
		'category__in' => explode(',', $cats),
		'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(); ?>
	<li class="related_box"  >
		<div class="r_pic">
		<a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>" target="_blank">
		<img src="<?php echo post_thumbnail_src(); ?>" alt="<?php the_title(); ?>" class="thumbnail" />
		</a>
		</div>
		<div class="r_title"><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>" target="_blank" rel="bookmark"><?php the_title(); ?></a></div>
	</li>
	<?php $i++;
	} wp_reset_query();
}
if ( $i  == 0 )  echo '<div class="r_title">暂时没有相关文章!</div>';
?>
</ul>

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