Platformsh\Cli\SelfUpdate\ManifestStrategy::getCurrentRemoteVersion PHP Method

    public function getCurrentRemoteVersion(Updater $updater)
    {
        $versions = array_keys($this->getAvailableVersions());
        if (!$this->allowMajor) {
            $versions = $this->filterByLocalMajorVersion($versions);
        }
        if (!$this->ignorePhpReq) {
            $versions = $this->filterByPhpVersion($versions);
        }
        $versionParser = new VersionParser($versions);
        $mostRecent = $versionParser->getMostRecentStable();
        // Look for unstable updates if explicitly allowed, or if the local
        // version is already unstable and there is no new stable version.
        if ($this->allowUnstable || $versionParser->isUnstable($this->localVersion) && version_compare($mostRecent, $this->localVersion, '<')) {
            $mostRecent = $versionParser->getMostRecentAll();
        }
        return version_compare($mostRecent, $this->localVersion, '>') ? $mostRecent : false;
    }