I’m using yappa-ng Photo Gallery since 2003. (yet another php photo album)

Unfortunately this software is no longer maintained and it’s not usable with modern php7+

I like yappa-ng  because it’s light, fast, and doesn’t need database or useless requirement
to manage your photos. You only need PHP and ImageMagick installed on server.
I manage more than 23,000 photos on my small personal FreeBSD server.

To continue to use this software, i have patch the php code, and my version is now PHP 7 compliant.

I also add a video preview to be able to see a thumbnail of video and Exif management of photos orientation to save time and avoid to rotate images manually.
(You need ffmpeg for the video preview)

You can download my patched source code here