/**
* Returns an array of modules which need upgrading
*
* @return array
*/
public static function getOutdatedModules()
{
if (self::$_outdated_modules == null) {
self::$_outdated_modules = array();
foreach (self::getModules() as $module) {
if ($module->isOutdated()) {
self::$_outdated_modules[] = $module;
}
}
}
return self::$_outdated_modules;
}