public static function loadClassFile($file) {
		$before = array_merge(get_declared_classes(), get_declared_interfaces());
		require_once $file;
		$after = array_merge(get_declared_classes(), get_declared_interfaces());

		$diff = array_diff($after, $before);

		#class was maybe already loaded
		if(!$diff) {
			foreach(array_merge(get_declared_classes(), get_declared_interfaces()) as $class) {
				$reflector = new \ReflectionClass($class);
				if($reflector->getFileName() == realpath($file)) {
					$result = $class;
					break;
				}
			}
			if(!isset($result))
				throw new \Exception('File '.$file.' does not contain any class.');
		}
		else
			$result = array_values($diff)[count($diff)-1];

		return $result;
	}