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Legacy modernization — guides and action plans

Posts about modernizing old PHP systems: code audits, refactoring, characterization tests, the strangler fig pattern, technical debt and PHP 8 upgrades. All written from the perspective of production projects — without rewriting from scratch.

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Legacy code modernization, step by step Legacy code audit — scope, cost and modernization plan Legacy code refactoring guide Strangler fig pattern — modernization without a rewrite Characterization tests for legacy code Technical debt management PHP migration and upgrade guide — 5.6/7.x to 8.x

23.10.2026 • 8 min

PHP Migration Checklist — 30 Points Before Deployment [2026]

30 items across five phases — from dependency inventory to post-deployment monitoring — with an acceptance criterion per phase and a list of the mistakes such a check eliminates. A migration plan template and a contractor inspection tool.

PHP Legacy

20.10.2026 • 15 min

PHP Migration & Upgrade Guide — 5.6/7.x to 8.x Action Plan [2026]

A PHP migration to 8.x removes security risks and speeds the application up without touching business code. The step-by-step path — from compatibility audit and tests, through Rector, to monitored deployment. With a support-date table, costs and a checklist.

PHP Performance Legacy

20.10.2026 • 8 min

Strangler Fig — Replacing an Old System Module by Module [2026]

Strangler Fig inverts rewrite risk: new code grows around the old and takes over functions one by one. How the interception layer works, how to sequence modules and which pitfalls to avoid.

Laravel PHP Legacy

20.10.2026 • 7 min

Characterization Tests — Safeguarding Legacy Code [2026]

Characterization tests document what old code does — bugs included — and give you a safety net for refactoring. The step-by-step method, PHP examples and the golden master variant.

PHP Legacy

20.10.2026 • 7 min

Technical Debt — How to Measure and Repay It [2026]

Technical debt is the cost of future work hidden in code. Where it comes from, how to measure it with four metrics and how to plan repayment without blocking product development.

PHP Legacy

20.10.2026 • 8 min

Legacy Code Audit — Scope, Timeline and Cost [2026]

A legacy code audit answers what works, what is a risk and where to start modernization. Five audit areas, the step-by-step process, cost and how to read the roadmap report.

PHP Legacy

20.10.2026 • 8 min

Legacy Code Refactoring — A Practical Guide [2026]

Legacy code refactoring improves the structure of old code without changing its behavior — and without stopping production. The order, techniques and tools that work in old PHP.

PHP Legacy

21.04.2026 • 14 min

Legacy Code Modernization — Step-by-Step Action Plan [2026]

Modernize legacy PHP code without a rewrite: audit and dependency map, characterization tests, modular refactoring and CI/CD. The full action plan with tools, timeline and costs.

PHP API Legacy

Legacy modernization — guides and action plans

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