PHP Major-Version Upgrade Program Playbook
Upgrade PHP across major versions as a program. Assess compatibility, apply automated refactors, raise static-analysis levels and typing, then roll out in stages with canary deployment.
Major PHP versions tighten type handling, remove deprecated functions, and bring real performance gains. This program upgrades PHP applications across versions using automated refactoring tools and rising static-analysis levels to make the move safe and to leave the codebase stronger than it started.
Phase-by-Phase
Compatibility Assessment. Scan for deprecated syntax and removed functions, audit Composer dependencies for version constraints, and baseline test coverage. The report turns vague upgrade anxiety into a concrete task list.
Automated Rectoring. Apply automated refactoring rule sets to mechanically modernize syntax, fix changes in type juggling and comparison semantics, and update Composer packages. Pre-commit hooks and CI keep the codebase consistent as changes land.
Static Analysis and Typing. Raise the static-analysis level incrementally, adding property, parameter, and return types. Adopt new language features like enums, readonly properties, and match expressions where they clarify the code. Security scanning runs in CI throughout.
Staged Rollout. Validate on staging, canary in production while watching the four golden signals, then decommission the old runtime. Blue-green deployment provides a clean rollback path.
Team and Roles
An architect sets static-analysis targets and typing standards. Backend engineers run the refactoring and resolve dependency conflicts. QA owns coverage and regression. DevOps manages CI gates and the staged rollout.
Risks and Mitigations
Changes in type juggling and comparison semantics cause subtle bugs; targeted tests and static analysis catch them. Dependency incompatibility is identified in the assessment and resolved before code changes pile up. Silent regressions are guarded by the coverage baseline. Coordinate so all engineers work against the same upgrade branch.
Success Criteria
Success is a higher static-analysis level, maintained or improved coverage, steady deployment frequency, and strong MTTR through rollout. The old PHP runtime should be fully retired.
Tooling
Use automated refactoring tooling, a static analyzer in CI, pre-commit hooks, and canary deployment. Laravel or the existing framework hosts the app, with MySQL and Redis as data and cache backends, packaged in Docker.