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The safest trunk-based workflow for WordPress is to merge small, reviewed code changes into one shared trunk, run automated checks on every change, deploy the same built artifact to staging, and require an explicit production gate. Keep plugins, themes, blocks, configuration, and deployment scripts in Git; manage posts, media, settings, orders, and other database state with a separate migration and content-synchronization process.
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What trunk-based development means in WordPress
Trunk-based development uses one shared integration branch, usually named trunk or main. Developers create short-lived branches or pull requests, merge them frequently, and keep the shared branch buildable. The goal is not to eliminate review or release controls. It is to reduce the time that incompatible work remains isolated.
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For a WordPress site, the trunk should contain the site code that your team owns: custom plugins, themes, block code, build configuration, dependency definitions, deployment scripts, and infrastructure configuration that can safely be versioned. WordPress core itself is a PHP, MySQL, and JavaScript project with Node/npm tooling, local setup instructions, and automated tests; its development repository also demonstrates keeping a working branch current with upstream trunk.
Editors can continue publishing while developers work. That is possible because code and runtime content are different classes of change. Git is excellent for PHP, JavaScript, CSS, templates, and configuration files. It does not automatically version every post revision, uploaded image, option value, order, form submission, or third-party integration record in the live database.
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The target workflow at a glance
| Stage | What happens | Control that matters |
|---|---|---|
| Local development | A developer changes code in a reproducible WordPress environment. | Match PHP, WordPress, database, extensions, Node, and build tooling closely enough to make results meaningful. |
| Pull request | A small change is reviewed before entering the shared trunk. | Required review, linting, tests, asset builds, dependency validation, and security checks. |
| Trunk CI | The merged revision is built and tested again. | Keep the branch deployable; publish a versioned artifact rather than rebuilding differently at each destination. |
| Staging | The validated artifact is deployed to a production-like environment. | Automatic deployment is useful for fast feedback; verify database and content assumptions explicitly. |
| Production release | An approved artifact is promoted during a controlled window or immediately when risk is low. | Manual approval, restricted permissions, monitoring, and a tested rollback path. |
| Progressive exposure | New behavior is enabled for selected users or traffic after deployment. | Feature flags, measurable success criteria, and a fast disable switch. |
GitLab’s delivery guidance groups continuous integration, environments, approvals, feature flags, and incremental rollouts as complementary controls. WordPress.com’s GitHub Deployments documentation likewise supports repository-connected staging and production synchronization. Those controls can be implemented with different hosting providers; the operating principles remain the same.
Step 1: Build a reproducible local WordPress environment
Match the important runtime components
Document the PHP version, WordPress version, database engine and version, required PHP extensions, Node/npm versions, and any command-line tools used to build assets. Pin dependency versions with the lockfiles appropriate to your PHP and JavaScript package managers. A developer should be able to clone the repository, install dependencies, load a known database snapshot, and reach a working site without hand-editing production files.
WordPress.com documents Studio as a local-development tool, while the WordPress development repository documents local setup and the Node/npm toolchain. You may use those or another reproducible environment; the critical requirement is that setup is documented and repeatable.
Separate local secrets from the repository
- Keep local database credentials and API keys in ignored environment files or a local secret manager.
- Commit a safe example configuration that names required variables without containing real values.
- Use disposable accounts and test payment credentials locally.
- Never copy production secrets into a developer database or commit them to Git.
Make local data useful but non-sensitive
Use a sanitized content snapshot when tests depend on realistic menus, custom post types, or block data. Record which imports and search-replacement steps are required. Media files can be large; keep them in an approved artifact or development storage location instead of silently adding a complete production media library to Git.
Step 2: Put the right WordPress assets in Git
Version code and delivery configuration
- Custom plugins, including activation and upgrade routines.
- Custom themes, templates, block definitions, and front-end source files.
- Build manifests, package definitions, lockfiles, lint rules, and test configuration.
- Deployment scripts, environment manifests, and database migration code.
- Documentation for setup, smoke tests, release approval, and recovery.
Keep generated assets either reproducibly buildable in CI or deliberately stored as release artifacts. Do not let an administrator’s direct edit to a production theme become the only copy of a change. If an emergency edit is unavoidable, capture it in the repository immediately and let the normal review process examine it afterward.
Use short-lived branches
Branch from the current trunk, make one coherent change, and open a pull request early. Merge once the checks and review are complete, then delete the branch. Long-running branches accumulate conflicts and make it difficult to know whether a plugin, theme, or build change still works with the current trunk.
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Incomplete work does not require a long-lived branch. Put unfinished paths behind a feature flag, a capability check, or another safe default so the code can be integrated while the user-visible behavior remains disabled.
Step 3: Make CI prove that trunk is deployable
Checks for every pull request
- Install PHP and JavaScript dependencies from locked versions.
- Build production assets and fail if the build produces uncommitted or missing files.
- Run PHP linting and the project’s unit or integration tests.
- Run JavaScript tests, formatting checks, and linting for blocks and front-end code.
- Validate plugin and theme headers, configuration syntax, and dependency changes.
- Run security checks appropriate to the codebase, including scanning dependencies and checking for accidentally committed credentials.
- Publish the build output as a uniquely identified artifact.
Tests should cover the behavior that can break a WordPress release: plugin activation and deactivation, custom post types, block rendering, REST endpoints, scheduled jobs, authentication and capability checks, cache invalidation, and integrations used by the site. A small site may begin with linting, a build, and focused tests; expand coverage as failures reveal unprotected paths.
Run the same or stricter checks on trunk
Pull-request checks protect the merge. A second run on the merged trunk catches mistakes caused by the exact combination of changes that now exists in the integration branch. If trunk fails, stop adding unrelated work, identify the offending revision, and either fix it forward or revert it quickly. The value of trunk-based development depends on restoring a buildable branch promptly.
Build once, promote the artifact
Do not rebuild source code separately for staging and production if you can avoid it. Build a versioned artifact in CI, record its commit identifier, and promote that same artifact. This prevents a different dependency resolution, Node version, or generated bundle from reaching production than the one tested in staging.
Step 4: Deploy trunk to staging automatically
Connect the repository to a staging environment or use a CI job that deploys the approved trunk artifact. Automatic staging deployment gives developers rapid feedback without granting every contributor production access. WordPress.com recommends this pattern in its GitHub Deployments guidance.
Keep staging production-like
- Use compatible PHP, WordPress, database, and extension versions.
- Exercise the same object, page, and full-page caching layers where practical.
- Configure cron, queues, webhooks, email delivery, search, and payment integrations with safe test endpoints.
- Apply the same build and deployment scripts used for production, with environment-specific secrets injected at runtime.
Staging data still needs a policy. Refreshing it from production can expose personal information and can overwrite test content. Define who may refresh it, how data is sanitized, and which records or media must be preserved for testing.
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Step 5: Run a release-focused staging check
Smoke-test the paths that earn or protect revenue
- Log in as an administrator, editor, and ordinary user where those roles exist.
- Create, edit, preview, schedule, and publish representative content.
- Render key templates and blocks on desktop and mobile viewports.
- Submit forms, complete a test transaction, and confirm the expected webhook or email behavior.
- Check search, redirects, cache purges, image handling, and structured data if the site relies on them.
- Verify scheduled events, background jobs, third-party APIs, and monitoring alerts.
Record the expected result for each check. A failed smoke test should identify whether the problem is code, configuration, stale cache, missing data, a migration, or an external service. That classification determines whether to fix forward, rerun deployment, or stop the release.
Step 6: Promote to production behind an explicit gate
Production should not be an accidental side effect of a successful pull request. Require a named approver, a scheduled release window, or another explicit control. Restrict the production deployment job to a small group and protect changes to the workflow files themselves with review.
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Prepare the release record
- Commit identifier and artifact identifier.
- Included plugin, theme, block, and configuration changes.
- Required database or option migrations and their expected duration.
- Smoke-test results and approver.
- Monitoring to watch immediately after release.
- Exact rollback artifact and data-recovery procedure.
Step 7: Use feature flags for incomplete or risky behavior
A feature flag separates deployment from exposure. The code can reach staging and production while a new checkout, block, search implementation, or integration remains disabled. Enable it for internal users, a small audience, or a measured percentage of traffic, then expand only when the agreed checks pass.
Design flags to fail safely
- Choose a disabled default if the flag service is unavailable.
- Keep the old path operational until the new path has been validated.
- Log which path was selected without recording sensitive personal data.
- Define an owner and removal date so temporary flags do not become permanent complexity.
- Document whether a flag is evaluated per request, per session, or per account.
Incremental rollout is not a substitute for tests or backups. It limits exposure, but a bad migration or incompatible schema change can still affect every request.
WordPress content and database changes need a separate plan
Classify each change before merging
| Change | Typical control |
|---|---|
| Plugin, theme, block, PHP, JavaScript, CSS, build file | Git review, CI, artifact promotion, and code rollback. |
| Posts, pages, menus, media, editorial revisions | Editorial workflow, export or synchronization policy, and backups. |
| Options, roles, rewrite rules, indexes, custom tables, schema | Versioned migration code with a compatibility and reversal plan. |
| Orders, form submissions, memberships, analytics records | Operational data controls; never overwrite casually during deployment. |
Make migrations backward-compatible
When possible, deploy code that can read both the old and new representation, run the migration, verify it, and only then remove the old path. For example, add a new option or column first, teach the plugin to write both formats, backfill existing rows in a controlled job, switch reads, and remove compatibility code in a later release. Document how to stop or reverse each stage.
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Code rollback cannot undo an irreversible content or schema mutation. Take a tested database backup or provider snapshot before a high-risk migration, and state who can restore it, how long restoration is expected to take, and what new content created after the backup would be lost.
Environment parity, secrets, and permissions
Keep local, staging, and production close enough that CI failures mean something. Exact parity is not always possible, especially for managed services, so record known differences and test the behaviors they can affect. A staging site that lacks the production cache, PHP extension, cron runner, or payment callback is not validating the complete release.
- Inject database credentials, API tokens, salts, and signing keys from the CI or hosting secret store.
- Use separate credentials for local, staging, and production.
- Grant deployment rights according to role; contributors do not need production access to merge code.
- Require review for CI workflow, deployment, and permission-file changes.
- Rotate credentials after a suspected exposure and invalidate old tokens.
Rollback and incident recovery
Code failure with unchanged data
Stop the rollout, disable the relevant feature flag if one exists, and redeploy the last known-good artifact. Preserve logs and the failed artifact for diagnosis. Fix the issue in a new change rather than patching production invisibly.
Migration or content failure
Pause jobs that may amplify the problem, preserve the current database state, and follow the documented recovery plan. Restore a backup or snapshot only after deciding how to reconcile legitimate content created since it was taken. A database restore is a data operation, not merely a Git revert.
Deployment-system failure
Keep an independent way to identify and retrieve the last known-good artifact. If the CI provider is unavailable, do not improvise by rebuilding on an unrecorded workstation; use the documented emergency procedure and capture every manual action for later review.
Choosing the right level of process
| Concern | Small team starting out | Larger or higher-risk site |
|---|---|---|
| Branching | One trunk with short pull requests and required review. | One trunk with stricter ownership rules and smaller change batches. |
| CI | Build, lint, focused tests, dependency and secret checks. | Broader integration, browser, performance, and security suites. |
| Staging | Automatic deployment after trunk passes. | Automatic deployment plus production-like data, integrations, and approval evidence. |
| Production | Manual approval and a known rollback artifact. | Multiple approvers, scheduled windows, progressive rollout, and formal incident monitoring. |
| Database | Documented migrations and a verified backup. | Backward-compatible expand-and-contract migrations, rehearsal, and measured recovery objectives. |
A smaller team does not need every enterprise control on day one. It does need a buildable trunk, automated checks that catch its common failures, a staging environment, and a production rollback path. Add stronger approvals, progressive flags, and broader tests as the site’s risk and team size increase.
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Common failure modes and fixes
“The branch passed, but staging is broken.”
Compare the artifact, runtime versions, environment variables, database state, cache, and scheduled jobs. If staging rebuilt dependencies instead of promoting the tested artifact, correct the pipeline first.
“Editors’ changes disappeared after deployment.”
The deployment likely treated a database dump or content export as disposable code. Separate code promotion from content synchronization, define ownership for each table or record type, and back up before imports.
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The migration was not designed for reversal or compatibility. Keep old and new representations readable during the transition, test the rollback procedure on a copy, and document data reconciliation before release.
“Feature flags are multiplying.”
Assign an owner and removal date to every flag. Delete stale code paths after rollout; otherwise the trunk becomes harder to test than the branch model it replaced.
Implementation checklist
- Define the shared trunk and a maximum lifetime for short-lived branches.
- Commit custom WordPress code, build files, migrations, and deployment configuration.
- Document local setup, supported runtime versions, and safe test data.
- Require pull-request review and automated build, test, lint, dependency, and security checks.
- Build a uniquely identified artifact and promote it unchanged to staging and production.
- Deploy trunk automatically to staging and run a written smoke-test suite.
- Require explicit production approval with restricted permissions.
- Keep secrets outside Git and separate credentials by environment.
- Classify every database and content change before release.
- Use backward-compatible migrations, verified backups, and a documented recovery path.
- Use feature flags for incomplete or risky behavior, with monitoring and removal dates.
This workflow keeps integration frequent without pretending that WordPress databases behave like source files. The trunk governs code; CI and staging expose integration problems; approvals and flags control exposure; and explicit data procedures protect the content and transactions that Git cannot roll back.
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