我为相关帖子中的show缩略图编写此代码。如果相关帖子没有缩略图,则应显示其内容中的第一张图片:
$output .= "<a href=\"".get_permalink($related_post->ID)."\">";
if(get_the_post_thumbnail($related_post->ID)) {
$output .= get_the_post_thumbnail($related_post->ID, $options['thumbnail_size']);
} else {
$output .= catch_image( $related_post->ID );
}
$output .= "</a>";
并且在function.php中我有这个功能:
function catch_image() {
global $post, $posts;
$first_img = '';
ob_start();
ob_end_clean();
$output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $post->post_content, $matches);
$first_img = $matches[1][0];
if(empty($first_img)) {
$first_img = "url for noimage.jpg";
}
return $first_img;
}
但这只是给了我这篇文章的第一张图片,而不是相关的帖子。我怎样才能获取我需要的内容?
答案 0 :(得分:1)
尝试使用此功能:
function catch_image($post_id) {
$first_img = '';
ob_start();
ob_end_clean();
$related_post = get_post($post_id);
$content = $related_post->post_content;
$output = preg_match_all('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $content, $matches);
$first_img = $matches[1][0];
if(empty($first_img)) {
$first_img = "url for noimage.jpg";
}
return $first_img;
}