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get_post_ancestors()

发布于 2017-09-10 23:49:35 字数 4071 浏览 1031 评论 0 收藏 0

get_post_ancestors( int|WP_Post $post )

Retrieve ancestors of a post.

description

参数

$post: (int|WP_Post) (Required) Post ID or post object.

返回值

(array) Ancestor IDs or empty array if none are found.

源代码

File: wp-includes/post.php

function get_post_ancestors( $post ) {
	$post = get_post( $post );

	if ( ! $post || empty( $post->post_parent ) || $post->post_parent == $post->ID )
		return array();

	$ancestors = array();

	$id = $ancestors[] = $post->post_parent;

	while ( $ancestor = get_post( $id ) ) {
		// Loop detection: If the ancestor has been seen before, break.
		if ( empty( $ancestor->post_parent ) || ( $ancestor->post_parent == $post->ID ) || in_array( $ancestor->post_parent, $ancestors ) )
			break;

		$id = $ancestors[] = $ancestor->post_parent;
	}

	return $ancestors;
}

更新日志

Version	description
2.5.0	Introduced.

User Contributed Notes

Skip to note content You must log in to vote on the helpfulness of this noteVote results for this note: 0You must log in to vote on the helpfulness of this note Contributed by Codex

Get Ancestors Page Slug
This example returns the highest page {slug} in a tree and uses it as a Body_Class, so the parent and all children will have the same Body Class!

This example for a twenty eleven child theme in the header.php file


</head>

<?php
/* Get the Page Slug to Use as a Body Class, this will only return a value on pages! */
$class = '';
/* is it a page */
if( is_page() ) { 
	global $post;
	/* Get an array of Ancestors and Parents if they exist */
	$parents = get_post_ancestors( $post->ID );
	/* Get the top Level page->ID count base 1, array base 0 so -1 */ 
	$id = ($parents) ? $parents[count($parents)-1]: $post->ID;
	/* Get the parent and set the $class with the page slug (post_name) */
	$parent = get_post( $id );
	$class = $parent->post_name;
}
?>

<body <?php body_class( $class ); ?>>

Get Ancestors Post Meta
If we did not want to use the page slug, we could use a custom field eg: body_class, on the top level page and set the class in the post meta.

</head>

<?php
$class = '';
if( is_page() ) {
	global $post;
	$parents = get_post_ancestors( $post->ID );
	$id = ($parents) ? $parents[count($parents)-1]: $post->ID;
	$class = get_post_meta( $id, 'body_class', true );
}
?>

<body <?php body_class( $class ); ?>>

Get Ancestors Page Thumbnail
Get the top level page thumbnail and display it!


<?php
global $post;
$parents = get_post_ancestors( $post->ID );
/* Get the ID of the 'top most' Page if not return current page ID */
$id = ($parents) ? $parents[count($parents)-1]: $post->ID;
if(has_post_thumbnail( $id )) {
	get_the_post_thumbnail( $id, 'thumbnail');
}
?>

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get_post_ancestors()

description

参数

返回值

源代码

更新日志

相关函数

Uses

Used By

User Contributed Notes

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

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get_post_ancestors()

description

参数

返回值

源代码

更新日志

相关函数

Uses

Used By

User Contributed Notes

如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。