setup_postdata( WP_Post|object|int $post )

Set up global post data.



(WP_Post|object|int) (Required) WP_Post instance or Post ID/object.


(bool) True when finished.

More Information

Sets up global post data. Helps to format custom query results for using Template tags.

setup_postdata() fills the global variables $id, $authordata, $currentday, $currentmonth, $page, $pages, $multipage, $more, $numpages, which help many Template Tags work in the current post context.

setup_postdata() does not assign the global $post variable so it’s important that you do this yourself. Failure to do so will cause problems with any hooks that use any of the above globals in conjunction with the $post global, as they will refer to separate entities.


global $post;

// modify the $post variable with the post data you want. Note that this variable must have this name!

setup_postdata( $post ); 


File: wp-includes/query.php

function setup_postdata( $post ) {
	global $wp_query;

	if ( ! empty( $wp_query ) && $wp_query instanceof WP_Query ) {
		return $wp_query->setup_postdata( $post );

	return false;


Version Description
4.4.0 Added the ability to pass a post ID to $post.
1.5.0 Introduced.

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