WordPress: Checking The Post Parent

If you are working with pages in WordPress that have sub-pages, there is a chance that at some point you are going to need to add conditions that apply to these sub-pages.

This is pretty easy and can be done by putting the following code in the relevant template file:

<?php 
	if ($post->post_parent == "123") {
		// If the page parent ID is 123, do stuff here...
	}
?>

Now, if you have sub-pages that have more sub-pages and you want a condition to apply to all pages under the “grandparent” page, simply use the following code:

<?php
	$ancestors = get_post_ancestors($post);
	if (in_array(123, $ancestors)) {
		// If the page grandparent ID is 123, do stuff here...
	}
?>
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