WordPress at a glance
function is not described

_maybe_update_themes() WP 2.7.0

Check themes versions only after a duration of time.

This is for performance reasons to make sure that on the theme version checker is not run on every page load.

No Hooks.

Return

Nothing (null).

Usage

_maybe_update_themes();

Code of maybe update themes: wp-includes/update.php VER 5.0.3

<?php
function _maybe_update_themes() {
	$current = get_site_transient( 'update_themes' );
	if ( isset( $current->last_checked ) && 12 * HOUR_IN_SECONDS > ( time() - $current->last_checked ) )
		return;
	wp_update_themes();
}