A PHP migration checklist for healthcare lists every step needed to move a legacy PHP platform safely, from the initial decision and inventory through security controls, foundations, data and integrations, testing, cutover and decommissioning. It helps teams avoid missed tasks that commonly cause outages, data errors or compliance gaps.
Healthcare migrations involve many moving parts, and small omissions cause big problems later. This checklist organizes the essential steps in order, linking to detailed guides for each area. It complements our Legacy PHP Platform Assessment, which produces much of the evidence the early steps require.
Before You Start: Decision and Governance
Every successful migration begins with a clear decision and strong governance. Before any code moves, leadership should agree on why the platform is changing, which approach fits, who owns the program and how success will be measured. Skipping these steps leads to programs that drift, stall or lose funding halfway through. In healthcare, governance must also include compliance, clinical and financial stakeholders from the start. The items below should be complete before discovery and engineering work begins in earnest, so the migration rests on shared understanding and clear accountability across the organization.
Confirm the Decision to Migrate
Confirm that migration is the right path rather than patching or upgrading. Document the evidence, including support status, upgrade difficulty and business needs. Our decision framework for moving off PHP helps teams reach a defensible conclusion before committing budget. Write it down.
Choose the Migration Approach
Decide whether each part of the platform will be refactored, re-platformed or rewritten. Our guide to rewrite vs refactor vs re-platform explains the trade-offs. Record the chosen approach for each module along with the reasons behind it. Revisit choices as evidence grows.
Secure Funding and Approval
Prepare a business case covering costs, benefits and risks, and secure approval for at least the first phases. Our guide to building the business case explains how to present phased funding effectively to leadership and finance teams. Phased approval works best.
Assign Program Ownership
Name an executive sponsor and a program owner with authority to make decisions. Define owners for clinical rules, financial logic, compliance and integrations. Clear ownership prevents delays caused by questions waiting weeks for answers from committees or unavailable stakeholders. Publish the names.
Define Success Measures
Agree how success will be measured, such as closed audit findings, retired unsupported software, faster releases or improved patient experience. Measurable goals keep the program focused and make progress visible to leadership throughout every phase of the migration. Keep them few.
Plan Communication
Decide how progress, risks and changes will be communicated to leadership, clinicians, staff, partners and patients. Regular, honest communication maintains support and prevents surprises. Assign someone responsible for communication rather than leaving it to whoever has time. Silence breeds worry and rumor.
Discovery and Inventory Checklist
Discovery builds the factual foundation for every later decision. It reveals what the platform actually does, which systems it connects to, where data lives and which rules matter most. Incomplete discovery is the most common reason migrations run late, because hidden features and integrations surface during cutover rather than during planning. A thorough inventory takes weeks rather than months for most platforms, and it pays for itself many times over. The items below cover what discovery should capture before migration phases are planned in detail and estimates are finalized for leadership.
Inventory Routes and Features
List every page, endpoint, form and feature, along with usage data from logs and analytics. Usage data shows which features matter most and which can be retired, reducing migration scope and focusing effort where patients and staff actually spend their time.
Map Integrations
List every integration with its protocol, partner, data, volume and contacts. Include file transfers, HL7 feeds, APIs and webhooks. Our integration migration guide explains what to record and how to prioritize each interface. Partner readiness often controls the overall timing of the program.
Catalog Scheduled Jobs
Find every cron job and scheduled task across all servers, and document its purpose, timing and dependencies. Background work is easy to miss. Our cron jobs to queues guide explains how to inventory and migrate these jobs safely. Check every server.
Profile the Data
Review database schemas, data volumes, quality issues and relationships. Identify tables holding protected health information and data shared with other systems. Early profiling reveals cleanup work and helps estimate data migration effort and risk accurately. Record findings for business owners to review.
Identify Business Rules
Document clinical, financial, consent and privacy rules, including where they live in code. Interview staff about edge cases and workarounds. Hidden rules are the most common source of post-migration problems, so this step deserves careful attention and time. Staff knowledge matters.
Record Versions and Infrastructure
Record PHP, framework, library, database and operating system versions, along with hosting details. This information shows urgent security exposure and shapes the target architecture. Our guide to unsupported PHP versions explains why versions matter. Unsupported versions should be flagged for urgent attention immediately.
Security and Compliance Checklist
Security and compliance must be built into the migration from the beginning, not checked at the end. Migration temporarily increases risk, because two systems run in parallel and data moves between them. Legacy platforms often carry known weaknesses that should be fixed immediately rather than waiting for migration to complete. Compliance teams need documentation throughout to update risk analyses and support audits. The items below ensure patient data stays protected during every phase, urgent risks are addressed early and the new platform meets current expectations for healthcare security and privacy.
Patch Urgent Vulnerabilities First
Address critical vulnerabilities in the current PHP platform before migration begins. Migration takes months, and patient data needs protection now. Our PHP2Shell guide shows why urgent patching cannot wait for longer modernization programs. Isolate anything that cannot be patched quickly, and document each exception.
Sign Business Associate Agreements
Confirm business associate agreements with every vendor and service that will access protected health information, including hosting, monitoring, identity and integration providers. Agreements must be in place before any engineer or service touches patient data in either system. Keep copies organized.
Plan Identity and Access
Design shared identity and consistent authorization across old and new systems. Our authentication migration guide explains how to keep users signed in safely while adding multi-factor authentication and stronger password handling. Consistent roles across both systems prevent accidental access to patient records.
Define Test Data Rules
Establish rules requiring synthetic or properly de-identified data in development and testing environments. Real patient data stays in production under production controls. Clear rules prevent one of the most common sources of healthcare data exposure during software projects. Enforce them strictly.
Plan Audit Logging
Design audit logging that covers both systems consistently, with shared formats and identifiers sent to a central store. Continuous audit trails support investigations and compliance throughout migration, when functionality is split between legacy and new platforms. Retention follows your policy.
Update the Risk Analysis
Document the migration architecture, data flows and controls, and update your HIPAA risk analysis accordingly. Our HIPAA risk assessment service helps formalize this documentation so auditors can see how risks are managed. Update it again at each major phase as the architecture changes.
Architecture and Foundations Checklist
Shared foundations make every later migration phase faster and safer. Building them first, before migrating business modules, avoids rework and ensures consistent security, monitoring and deployment practices across the new platform. Foundations include the target architecture, the routing layer that directs traffic between systems, deployment pipelines, observability and coding standards. Teams that skip foundations often rebuild them repeatedly for each module, wasting time and creating inconsistency. The items below should be in place before the first business module moves, giving every later phase a stable, well-understood base to build on.
Design the Target Architecture
Define services, data ownership, hosting, security controls and integration patterns for the new platform. Review the design with engineers, security and compliance teams. A clear target prevents each module from inventing its own patterns during migration. Document every decision. Share it widely.
Build the Routing Layer
Set up the routing layer that sends each request to either PHP or new services. Our strangler fig migration guide explains how this layer enables incremental migration with instant rollback for each route. Test rollback before the first module moves to production.
Set Up Delivery Pipelines
Build automated pipelines for testing, security scanning and deployment. Our healthcare CI/CD implementation work creates pipelines that make every release repeatable, traceable and safe to perform frequently during migration. Automated quality gates block releases that change behavior unexpectedly or fail security scans.
Establish Observability
Set up logging, metrics, tracing and alerting for both systems from the start. Observability lets teams compare performance, detect problems quickly and verify each cutover. Without it, teams cannot tell whether migrated modules behave as well as the originals. Baselines matter.
Define Coding Standards
Agree on coding standards, patterns, security practices and review requirements for the new codebase. Standards keep code consistent across teams and AI-assisted work. Our guide to AI-assisted PHP to TypeScript migration explains why standards matter. Reviews enforce them consistently across teams.
Harden the New Stack
Apply security hardening to the new runtime, frameworks and dependencies from the beginning. Our Node.js HIPAA security checklist covers supply chain controls, secrets management and logging for new services. Hardening early is far cheaper than retrofitting security after several modules have moved.
Data and Integration Checklist
Data and integrations carry the highest risk in most healthcare migrations. Patient records, appointments, claims and payments must arrive intact, and partners must keep receiving accurate messages throughout. Mistakes can affect patient care and revenue directly. Planning these areas carefully, with validation, partner coordination and rollback options, keeps risk manageable. Many teams keep the existing database during early phases and move integrations one at a time. The items below cover what must be planned and completed for data and integrations before and during each migration phase. Plan these areas early.
Decide the Database Strategy
Decide whether to keep the existing database initially, refactor its schema or move to another engine. Our MySQL to PostgreSQL guide explains when moving databases makes sense and how to protect patient data. Many teams keep the existing database initially to reduce early risk.
Define Data Ownership
Assign each table or domain to one owning system responsible for writes, with others reading through defined interfaces. Clear ownership prevents conflicting updates and corrupted records while both systems run in parallel during migration. Document every assignment. Enforce it in reviews.
Plan Data Validation
Define validation methods, including row counts, checksums, business totals and clinical spot checks. Agree who signs off results for each data domain. Validation plans should be ready before migration rehearsals begin, not improvised during cutover. Agree sign-off owners before rehearsals start.
Book Partner Testing Windows
Contact integration partners early, confirm testing requirements and book testing windows. Partner schedules often control migration timing, so early engagement prevents delays. Record partner contacts and escalation paths for use during cutover. Some partners require several weeks of notice before testing.
Prepare Message Queuing
Plan how inbound messages and transactions will be queued and replayed during cutovers, so nothing is lost while connections switch. Message queuing protects results, referrals and claims from disappearing during the brief moments when systems change. Test replay order carefully.
Plan Background Job Cutover
For each scheduled job, plan the switch from cron to the new queue system, ensuring exactly one system runs each job at any time. Dry runs and output comparisons should confirm correctness before each switch happens. Never let jobs overlap.
Testing and Cutover Checklist
Testing proves that migrated functionality behaves exactly like the original, and careful cutover moves users without disruption. In healthcare, both must be thorough, because errors affect patient care, finances and compliance. Characterization tests, parallel running, staged rollout and rehearsed rollback form the core of a safe approach. Cutovers should be planned around clinical schedules, billing cycles and partner availability, with clear go and no-go criteria. The items below should be complete for every migration phase, from the first low-risk module through the final, most critical clinical and financial functionality. Quality comes first.
Write Characterization Tests
Capture current behavior for every module before migrating it, especially clinical, financial and consent logic. Our characterization testing guide explains techniques for building these tests efficiently in legacy PHP codebases. Run them automatically on every change, so behavior differences are caught before release.
Run Parallel Comparisons
For critical logic, run old and new implementations side by side on real requests and compare outputs automatically. Investigate and resolve every difference before cutover, involving business owners when clinical or financial outcomes are affected. Document every resolution. Track results daily.
Rehearse Cutovers
Rehearse each cutover in a production-like environment with realistic data volumes and traffic. Rehearsals reveal timing problems, missing steps and rollback gaps. Update runbooks after each rehearsal so the real cutover follows a proven, documented procedure. Practice builds confidence. Repeat as needed.
Plan Zero-Downtime Switches
Use routing switches, feature flags and staged rollout to avoid planned outages. Our zero-downtime migration guide explains techniques for cutting over clinical systems without disrupting patients or staff. Schedule cutovers during quieter periods, and keep rollback ready for every switch.
Define Go and No-Go Criteria
Agree in advance what must be true to proceed with each cutover and what triggers a stop or rollback. Predefined criteria remove pressure to continue when something looks wrong, protecting patients and operations during critical moments. Write them down beforehand.
Verify After Every Cutover
Monitor technical metrics, business outcomes, clinical workflows and integrations closely after each cutover. Ask staff to confirm key workflows. Declare success only after a defined stabilization period, then remove the replaced PHP code for that functionality. Patience pays off here.
Decommissioning and After Migration
Migration is not complete until the legacy PHP platform is fully retired and the new platform is operating smoothly under long-term ownership. Decommissioning is often rushed or forgotten, leaving old servers running with outdated software, unused credentials and copies of patient data. After migration, the new platform also needs ongoing maintenance, monitoring and improvement to avoid becoming the next legacy system. The items below close out the migration properly, reduce lingering risk and set the organization up to keep its platform current, secure and adaptable for years to come. Finish properly.
Archive Legacy Data
Archive data from the legacy platform according to retention requirements, keeping it accessible for legal, clinical and audit needs. Document where archives live, who can access them and how long they will be kept before secure deletion. Test archive access too.
Revoke Credentials and Access
Revoke database credentials, API keys, partner connections and user accounts tied to the legacy platform. Lingering credentials create security risk. Confirm with partners that old endpoints and connections are no longer in use before shutting them down. Verify every removal.
Shut Down Infrastructure
Shut down legacy servers and services securely, wiping storage according to policy. Document decommissioning steps for compliance records. Our PHP upgrade services team can help with any modules intentionally left on supported PHP. Leaving old servers running wastes money and keeps unnecessary security exposure alive.
Update Documentation
Update architecture diagrams, runbooks, data flow documentation and risk analyses to reflect the final state. Accurate documentation supports audits, onboarding and future changes, and removes confusion caused by references to systems that no longer exist. Assign an owner for it.
Plan Ongoing Maintenance
Set up routines for runtime updates, dependency patching, monitoring and security testing. Regular small updates prevent the new platform from falling behind. Our migration services include care plans for this ongoing work. Budget for it every year so updates never get postponed.
Review Lessons Learned
Hold a review covering what worked, what did not and what to change next time. Share findings with leadership and teams. Lessons learned improve future projects and help the organization handle its next modernization challenge more effectively. Act on the findings.
Frequently Asked Questions
Healthcare technology teams often ask where to start, which steps are most commonly missed and how long the checklist takes to complete. The answers below reflect our experience guiding healthcare organizations through PHP migrations of different sizes. They are general guidance, and the order and depth of each step depend on your platform, risks and resources. If you would like help applying this checklist to your platform, our team can assess your current state and identify which items need attention first and how to sequence the rest. There is no obligation.
Where should we start the checklist?
Start with the decision and governance steps, then discovery. These provide the evidence and ownership every later step depends on. Urgent security issues should be addressed in parallel, regardless of where you are in the checklist. Momentum follows clarity. Begin today.
Which steps are most often missed?
Scheduled jobs, hidden business rules, partner testing windows, test data rules and decommissioning are missed most often. Each causes problems later, so give them explicit owners and deadlines in your plan. Review these items again before every migration phase begins.
Do small applications need the full checklist?
Yes, though each step may be smaller. Even simple applications have integrations, data and users that need protecting. Scaling each step to your platform keeps the process proportionate without skipping important safeguards. Proportion matters more than skipping steps. Scale thoughtfully.
How long does it take to work through the checklist?
It depends on platform size and complexity. Our migration timeline guide gives indicative ranges by application size and explains which phases take longest. An assessment narrows estimates for your platform, so leadership can plan budgets and staffing with confidence. Plan accordingly.
Can we complete steps in parallel?
Many steps can run in parallel, such as discovery and urgent security fixes, or foundations and early testing. Dependencies matter, though. Foundations should exist before modules migrate, and validation plans before data moves. Plan dependencies explicitly in your schedule. Coordinate carefully.
Who should own the checklist?
The program owner should own the overall checklist, with named owners for each area such as security, data, integrations and testing. Shared visibility keeps everyone aware of progress and blockers. Review progress at every phase meeting. Keep it visible. Ownership matters.
Tell Us About Your Migration
Tell us where your PHP migration stands today and which steps concern you most. We will help you prioritize the checklist for your platform. We will also suggest which steps to tackle first, with no obligation to proceed. Book a free consultation.