WordPress at a glance
function is not described

update_post_cache() WP 1.5.1

Updates posts in cache.

No Hooks.

Return

null. Null. Nothing.

Usage

update_post_cache( $posts );
$posts(WP_Post[]) (required) (passed by reference — &)
Array of post objects (passed by reference).

Changelog

Since 1.5.1 Introduced.

Code of update_post_cache() WP 5.7.1

<?php
function update_post_cache( &$posts ) {
	if ( ! $posts ) {
		return;
	}

	foreach ( $posts as $post ) {
		wp_cache_add( $post->ID, $post, 'posts' );
	}
}