DokuWiki is a mature, open-source PHP wiki engine designed for simplicity and ease of use. It provides a full wiki content management system with features including page creation/editing, revision history, access control lists (ACL), full-text search, media management, RSS/Atom feeds, a plugin system, and multiple authentication backends (plain, LDAP, Active Directory, PDO). The architecture is monolithic but highly modular, with a clear action dispatcher, an event-driven plugin system, a custom parser supporting both native DokuWiki syntax and GitHub Flavored Markdown (GFM), and a template system. Entry points include doku.php (main page request), feed.php, install.php, and various CLI tools (bin/). The codebase is well-structured with namespaced classes, extensive test coverage (PHPUnit), and a strong emphasis on internationalization (over 50 language packs). It is actively maintained with regular commits, CI pipelines, and a large plugin ecosystem.