调用图片

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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() ?>" target="_blank" rel="external nofollow"  ><img src="<?php echo catch_that_image() ?>" alt="" /></a></p> </li> <?php endwhile;?> <?php else : ?> <?php endif; ?>
37 　　      

转载于:https://www.cnblogs.com/iz100/archive/2013/05/12/3073634.html