Components_Component_Base::getPreviousVersion PHP Method

    public function getPreviousVersion()
    {
        $previousVersion = null;
        $currentVersion = $this->getVersion();
        $currentState = $this->getState();
        $versions = $this->getPackageXml()->getVersions();
        usort($versions, function ($a, $b) {
            return version_compare($a['version'], $b['version']);
        });
        foreach ($versions as $version) {
            // If this is a stable version we want the previous stable version,
            // otherwise use any previous version.
            if ($currentState == 'stable' && $version['stability'] != 'stable') {
                continue;
            }
            if (version_compare($version['version'], $currentVersion, '>=')) {
                return $previousVersion;
            }
            $previousVersion = $version['version'];
        }
        return $previousVersion;
    }