You can also look up for these other topics:
Framework
Coding Standards
Boilerplate
CMS
Tool
Security
Hacktoberfest
Self-hosted Image Hosting solution, your own Flickr/imgur alternative with your rules.
rodberAn easy to use, simple to manage, web photo gallery written in PHP.
UberGalleryThis is a Hotel Management System. Languages used are HTML, CSS, JavaScript, PHP and MySQL.
vaibhavverma9999