Modernizing a 10+ Year Old PHP Application into Laravel 12 (Historical Text Archive Case Study)

When you inherit a PHP application that has been running for over a decade, stability and technical debt often grow together. That was the situation with the Historical Text Archive (HTA), a long-running content site containing hundreds of historical articles, primary sources, and educational material. Over time, the original codebase became harder to maintain, harder to extend, and increasingly difficult to integrate with modern tooling. Rather than continue patching the legacy system, we decided to modernize the platform using Laravel 12 while preserving the data structure and URLs that search engines already trust. HTA is publicly available here: https://historicaltextarchive.org Goals of the Migration We wanted to improve: maintainability security search functionality extensibility performance developer experience while keeping: existing URLs intact article IDs stable database structure understandable SEO authority preserved Challenges of Legacy PHP The original application was bui