WordPress的特色图像是一个很实用的功能，可以在文章列表中为每篇文章添加一张缩略图。但特色图像需要在编辑文章时手动添加很不方便，下面的代码可自动将文章中的第一张图片设置为特色图像。
将下面的代码添加到当前主题的functions.php中：
- wpforce_featured() {
- ;
- = has_post_thumbnail(->ID);
- (!) {
- = get_children( );
- () {
- foreach ( => ) {
- set_post_thumbnail(->ID, );
- }
- }
- }
- }
- add_action(\’the_post\’, \’wpforce_featured\’);
- add_action(\’save_post\’, \’wpforce_featured\’);
- add_action(\’draft_to_publish\’, \’wpforce_featured\’);
- add_action(\’new_to_publish\’, \’wpforce_featured\’);
- add_action(\’pending_to_publish\’, \’wpforce_featured\’);
- add_action(\’future_to_publish\’, \’wpforce_featured\’);
如果当前文章中没有图片，但又想显示一张默认的缩略图该怎么办，可以将上面的代码修改一下，调用媒体库中某个图片作为默认的缩略图：
- wpforce_featured() {
- ;
- = has_post_thumbnail(->ID);
- (!) {
- = get_children( );
- () {
- ( => ) {
- set_post_thumbnail(->ID, );
- }
- } {
- set_post_thumbnail(->ID, \’414\’);
- }
- }
- }
- add_action(\’the_post\’, \’wpforce_featured\’);
- add_action(\’save_post\’, \’wpforce_featured\’);
- add_action(\’draft_to_publish\’, \’wpforce_featured\’);
- add_action(\’new_to_publish\’, \’wpforce_featured\’);
- add_action(\’pending_to_publish\’, \’wpforce_featured\’);
- add_action(\’future_to_publish\’, \’wpforce_featured\’);
其中的数字414，是媒体库中某个图片附件的ID号。
源代码出自：http://wpforce.com/automatically-set-the-featured-image-in-wordpress/
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