get_post_ancestors()

最后更新于：2021-11-26 22:27:28

get_post_ancestors( int|GC_Post$post)

Retrieves the IDs of the ancestors of a post.

参数

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

响应

(int[]) Array of ancestor IDs or empty array if there are none.

源文件

文件: gc-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          = $post->post_parent;
	$ancestors[] = $id;

	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, true ) ) {
			break;
		}

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

	return $ancestors;
}

</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 ); ?>>

</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 ); ?>>