1 //1. 首先在 function.php 中新增函数 catch_that_image
2 function catch_that_image() {
3 global $post, $posts;
4 $first_img = '';
5 ob_start();
6 ob_end_clean();
7 $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);
8 $first_img = $matches [1] [0];
9 if(empty($first_img)){ //Defines a default image
10 $first_img = "http://yourwebsite/default.jpg";
11 }
12 return $first_img;
13 }
14
15 //1.1 function.php的另外一种方法
16 function catch_the_image( $id ) {
17 // global $post, $posts;
18 $first_img = '';
19 // 如果设置了缩略图
20 $post_thumbnail_id = get_post_thumbnail_id( $id );
21 if ( $post_thumbnail_id ) {
22 $output = wp_get_attachment_image_src( $post_thumbnail_id, 'large' );
23 $first_img = $output[0];
24 }
25 else { // 没有缩略图，查找文章中的第一幅图片
26 ob_start();
27 ob_end_clean();
28 $output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);
29 $first_img = $matches [1] [0];
30 if(empty($first_img)){ // 既没有缩略图，文中也没有图，设置一幅默认的图片
31 $first_img = "http://yourdomain.tld/images/default.jpg";
32 }
33 }
34 return $first_img;
35 }
36 //2. 调用 <img src="<?php echo catch_that_image() ?>" alt="" /> //3. 循环调用 <?php if (have_posts()) : ?> <?php query_posts('cat=3' . $mcatID. '&caller_get_posts=1&showposts=6'); ?> <?php while (have_posts()) : the_post(); ?> <li> <p><a href="<?php the_permalink() ?>" ><img src="<?php echo catch_that_image() ?>" alt="" /></a></p> </li> <?php endwhile;?> <?php else : ?> <?php endif; ?>
37
View Code
