WordPress函数get_children可用于获取文章下的附件、子页面,通常我用来获取文章缩略图。
1 | get_children( array $args = '', constant $output = OBJECT ) |
函数参数
$args
数组或字符串值
get_children()函数$args参数默认的值如下:
1 2 3 4 5 6 | $defaults = array( 'numberposts' => -1, 'post_type' => 'any', 'post_status' => 'any', 'post_parent' => 0, ); |
get_children()函数$args参数可用的值如下:
numberposts
整数型,默认值:-1
指定返回信息的数量,默认不限制
post_parent
整数型,默认值:0
父元素的ID,指定一个文章ID,将返回该文章下的子元素
post_type
字符串值,默认值:any
指定文章类型,例如:attachment、page、revision,默认所有类型
post_status
字符串值,默认值:any
文章状态,例如:publish、draft、inherit
post_mime_type
字符串值,默认为空
指定文件的MIME类型,例如:image、video、video/mp4,在返回指定格式的附件时特别有用
函数返回值
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | Array ( [240] => WP_Post Object ( [ID] => 240 [post_author] => 1 [post_date] => 2014-07-25 09:27:19 [post_date_gmt] => 2014-07-25 01:27:19 [post_content] => [post_title] => baiduseo [post_excerpt] => [post_status] => inherit [comment_status] => open [ping_status] => closed [post_password] => [post_name] => baiduseo [to_ping] => [pinged] => [post_modified] => 2014-07-25 09:27:19 [post_modified_gmt] => 2014-07-25 01:27:19 [post_content_filtered] => [post_parent] => 239 [guid] => http://localhost/wp-content/uploads/2014/07/baiduseo.jpg [menu_order] => 0 [post_type] => attachment [post_mime_type] => image/jpeg [comment_count] => 0 [filter] => raw ) ) |
函数使用示例
返回ID为239的文章下的所有图片:
1 | $images = get_children( 'post_parent=239&post_type=attachment&post_mime_type=image' ); |
获取文章第一张图片的缩略图:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | <?php function echo_first_image( $postID ) { $args = array( 'numberposts' => 1, 'order' => 'ASC', 'post_mime_type' => 'image', 'post_parent' => $postID, 'post_status' => null, 'post_type' => 'attachment', ); $attachments = get_children( $args ); if ( $attachments ) { foreach ( $attachments as $attachment ) { echo '<img src="' . wp_get_attachment_thumb_url( $attachment->ID ) . '" class="current">'; } } } ?> |
扩展阅读
get_children()函数位于:wp-includes/post.php
相关函数:
- wp_get_attachment_link()
- get_page_children()
原文链接:https://xiaohost.com/2340.html,转载请注明出处。