描述:
给文章添加自定义缩略图(特色图像)
用法:
<?php set_post_thumbnail( $post, $thumbnail_id ); ?>
参数:
$post
(int/object) (必填) 文章ID
默认值: None
$thumbnail_id
(integer) (必填) 图像ID
默认值: None
源文件:
/**
* Set a post thumbnail.
*
* @since 3.1.0
*
* @param int|WP_Post $post Post ID or post object where thumbnail should be attached.
* @param int $thumbnail_id Thumbnail to attach.
* @return int|bool True on success, false on failure.
*/
function set_post_thumbnail( $post, $thumbnail_id ) {
$post = get_post( $post );
$thumbnail_id = absint( $thumbnail_id );
if ( $post && $thumbnail_id && get_post( $thumbnail_id ) ) {
if ( wp_get_attachment_image( $thumbnail_id, 'thumbnail' ) )
return update_post_meta( $post->ID, '_thumbnail_id', $thumbnail_id );
else
return delete_post_meta( $post->ID, '_thumbnail_id' );
}
return false;
}