WordPress at a glance
function is not described

update_category_cache() WP 1.5.0

Deprecated in 3.1.0. It is no longer supported and can be removed in future releases. It is recommended to replace this function with the same one.

Update the categories cache.

This function does not appear to be used anymore or does not appear to be needed. It might be a legacy function left over from when there was a need for updating the category cache.

No Hooks.

Return

true/false. Always return True

Usage

update_category_cache();

Code of update category cache: wp-includes/deprecated.php WP 5.2.2

<?php
function update_category_cache() {
	_deprecated_function( __FUNCTION__, '3.1.0'  );

	return true;
}