Core_Command::get_updates PHP Method

    private function get_updates($assoc_args)
    {
        wp_version_check();
        $from_api = get_site_transient('update_core');
        if (!$from_api) {
            return array();
        }
        $compare_version = str_replace('-src', '', $GLOBALS['wp_version']);
        $updates = array('major' => false, 'minor' => false);
        foreach ($from_api->updates as $offer) {
            $update_type = Utils\get_named_sem_ver($offer->version, $compare_version);
            if (!$update_type) {
                continue;
            }
            // WordPress follow its own versioning which is roughly equivalent to semver
            if ('minor' === $update_type) {
                $update_type = 'major';
            } else {
                if ('patch' === $update_type) {
                    $update_type = 'minor';
                }
            }
            if (!empty($updates[$update_type]) && !Comparator::greaterThan($offer->version, $updates[$update_type]['version'])) {
                continue;
            }
            $updates[$update_type] = array('version' => $offer->version, 'update_type' => $update_type, 'package_url' => !empty($offer->packages->partial) ? $offer->packages->partial : $offer->packages->full);
        }
        foreach ($updates as $type => $value) {
            if (empty($value)) {
                unset($updates[$type]);
            }
        }
        foreach (array('major', 'minor') as $type) {
            if (true === \WP_CLI\Utils\get_flag_value($assoc_args, $type)) {
                return !empty($updates[$type]) ? array($updates[$type]) : false;
            }
        }
        return array_values($updates);
    }