What are CodeIgniter to Laravel migration steps?

Six steps. One, code audit of the existing CodeIgniter codebase, including dependency inventory and database schema review. Two, Laravel architecture proposal with the new ERD and module structure. Three, build the new Laravel app alongside the CodeIgniter app with feature parity, shipping in two week sprints. Four, data migration scripts that move records from CodeIgniter tables to the new Laravel schema. Five, shadow testing where both apps run with mirrored traffic to verify behaviour. Six, cutover with 301 redirects, DNS switch, and CodeIgniter retired. Most CodeIgniter migrations take three to five months.