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A practical trunk-based WordPress workflow keeps plugin, theme, block, and deployment code in one shared Git trunk, integrates small changes continuously, and promotes the same tested build from staging to production. It does not put posts, media, orders, or every WordPress setting in Git automatically, so database content and migrations need separate controls.

The reliable pattern is local development, short-lived pull requests, automated checks on every change, automatic deployment to a production-like staging site, explicit production approval, and a tested rollback plan. Feature flags let you merge incomplete functionality without exposing it to every visitor.

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What trunk-based development means for WordPress

Trunk-based development uses one shared integration branch, usually called trunk or main. Developers keep branches or pull requests short-lived, merge small changes frequently, and keep the trunk buildable. Continuous integration (CI) detects conflicts, failed tests, broken assets, and unsafe dependency changes soon after they are introduced rather than at the end of a long release cycle.

For a WordPress site, the trunk should contain the code that your team owns and deploys:

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  • Custom and internally maintained plugins.
  • Classic themes, block themes, child themes, and theme configuration.
  • Custom blocks and their JavaScript, CSS, and PHP build sources.
  • Composer, npm, and other dependency manifests and lockfiles.
  • Build configuration, web-server rules, deployment scripts, and infrastructure definitions that belong to the site.
  • Tests, coding standards, static-analysis configuration, and CI workflow files.

WordPress core itself is a PHP, MySQL, and JavaScript project with Node/npm tooling, local-development instructions, and automated tests. Your site repository can follow the same principle without placing the entire WordPress core repository under your team’s day-to-day feature workflow. Keep the core version and update policy explicit, then test core updates through the same environments.

The crucial boundary is that Git versions files, while much of WordPress’s operating state lives in a database. Posts, pages, media references, menus, widgets, settings, form entries, orders, user accounts, and plugin-generated records do not become safely versioned merely because the plugin that created them is in Git. A trunk workflow therefore combines code delivery with a separately documented content and database process.

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The environment path: local to production

Use the same promotion path for every change. Build an artifact once, validate it, and promote that artifact instead of rebuilding different code for each environment.

Environment Purpose Typical control What must be checked
Local Fast implementation and debugging Reproducible WordPress installation, matching PHP and Node versions where practical Unit or integration tests relevant to the change, local content fixtures, linting
Pull request CI Prevent an unreviewed change from entering trunk Required review and automated status checks Build, PHP and JavaScript tests, coding standards, dependency and security checks
Trunk CI Confirm that the integrated branch remains deployable Automatic build and artifact publication Full applicable test suite and a reproducible release artifact
Staging Production-like verification Automatic deployment of the validated trunk artifact Smoke tests, migrations, integrations, caching, cron, and representative content
Production Serve visitors and editors Manual approval, scheduled window, or equivalent gate Pre-deploy backup, release approval, post-deploy health checks, rollback readiness

WordPress.com’s GitHub Deployments documentation describes connecting a repository and syncing changes to staging or production, with automatic staging deployments and manual production deployments as the recommended control pattern. GitLab’s release guidance groups CI, environments, approvals, feature flags, and incremental rollouts into one delivery workflow.

Step 1: Make local development reproducible

Start with a local environment that another developer can recreate without guessing which PHP extensions, database version, WordPress release, or Node tooling you used. WordPress.com documents Studio as a local-development option, and the WordPress development repository documents local setup and its Node/npm toolchain. Other local stacks are possible; the important property is repeatability, not a particular vendor.

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Record the versions that affect behavior

  • PHP version and required extensions.
  • WordPress version and any minimum-version policy.
  • Database engine and supported version range.
  • Node.js and npm versions used to build assets.
  • Composer and npm lockfiles, if those package managers are used.
  • Web-server settings that affect permalinks, rewrites, uploads, or caching.

Put setup instructions in the repository. Include how to install dependencies, build assets, load a safe database fixture, run tests, and reset a local site. Never commit production passwords, API keys, salts, or customer data to make local setup easier.

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Step 2: Define what belongs in Git and what does not

Create a clear repository boundary before merging features. A common layout keeps each custom plugin or theme in its own directory, with shared build and deployment configuration at the repository root. The exact folders can differ, but every deployable file should have an owner and a review path.

Code that normally belongs in Git

  • PHP, JavaScript, CSS, block metadata, templates, and theme assets.
  • Source files and generated build output when your deployment process requires the output.
  • Dependency manifests and lockfiles.
  • Database migration code, migration versions, and rollback documentation.
  • CI definitions, deployment manifests, and environment-specific configuration templates.

State that needs a separate policy

  • Posts, pages, revisions, comments, users, and media records.
  • WooCommerce-style orders or other transactional data.
  • Form submissions, analytics records, and plugin-owned tables.
  • Site options, widget placements, navigation changes, and editorial settings.
  • Uploaded media files and any external object-storage references.

Decide whether each database change is migrated, synchronized selectively, recreated from code, or left as environment-owned state. Document which environment is authoritative for editorial content. A staging refresh from production can overwrite test content; a production-to-staging copy can also expose personal data unless it is scrubbed.

Step 3: Use short-lived branches and frequent merges

Develop one small, reviewable change at a time. A branch should represent a focused behavior or fix, not an entire quarter of work. Open a pull request early when your team benefits from design feedback, but merge only after the automated checks and required review pass.

  1. Create a branch from the current trunk.
  2. Implement the smallest coherent change, including tests and any migration documentation.
  3. Run the same build and test commands locally that CI will run.
  4. Push the branch and open a pull request with the expected behavior, affected environments, and rollback notes.
  5. Resolve review comments promptly and rebase or update the branch from trunk if it has drifted.
  6. Merge after required checks pass. Delete the branch so unfinished work does not become a second long-lived integration line.

When a feature cannot be completed in one merge, separate deployability from visibility. Merge the underlying code behind a feature flag, keep the default disabled, and follow up with smaller changes. This preserves trunk health without exposing unfinished behavior.

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Step 4: Build a CI pipeline that understands WordPress

Run CI on pull requests and on trunk. The pipeline should fail quickly on cheap checks, then run slower integration tests against a disposable WordPress installation.

Recommended check layers

  1. Formatting and linting: Check PHP coding standards, JavaScript, CSS, JSON, YAML, and block metadata.
  2. Dependency validation: Install from lockfiles, detect unexpected changes, and flag known vulnerable packages according to your security tooling.
  3. Build: Compile block and theme assets with the repository’s Node/npm scripts and verify that the generated files are complete.
  4. PHP tests: Run unit tests and, where useful, WordPress integration tests against supported PHP and database versions.
  5. JavaScript tests: Run component, block-editor, and browser tests appropriate to the code.
  6. Static and security analysis: Check unsafe input handling, escaping, authorization, nonce use, and accidental secrets.
  7. Packaging: Produce one immutable artifact containing the exact code that will be deployed.

Keep CI configuration under review like application code. Restrict who can change workflows, require review for changes that alter deployment permissions, and make secrets available through the CI or hosting secret store rather than repository files.

Step 5: Deploy trunk automatically to staging

After trunk CI succeeds, deploy the produced artifact to staging automatically. Automatic staging deployment shortens feedback time and prevents a separate manual packaging step from introducing drift.

Staging verification checklist

  • Confirm the expected code and dependency versions are present.
  • Run database migrations in the documented order.
  • Test administrator login, editorial publishing, previews, and scheduled posts.
  • Submit important forms and verify email, webhook, and third-party integrations.
  • Exercise search, permalinks, redirects, feeds, and any multilingual or membership paths the site uses.
  • Check payments or checkout in a safe test mode; never use live transactions for routine verification.
  • Verify page caching, object caching, CDN behavior, image handling, and cache invalidation.
  • Confirm cron jobs, queues, scheduled imports, and background processing.
  • Inspect logs and error monitoring for new warnings or fatal errors.

Staging should resemble production in PHP, WordPress, database, extensions, web-server behavior, Node build tooling, and caching. It does not have to be identical in scale, but differences that can change code paths must be visible and intentional.

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Step 6: Handle database migrations without breaking old code

Deploying PHP files and changing database structure are related but not identical operations. Prefer backward-compatible migrations so the old release can continue running while the new release is being rolled out.

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A safer migration sequence

  1. Deploy code that can read both the old and new data shape.
  2. Run an additive migration, such as creating a nullable column or new table, without deleting data.
  3. Backfill data in a controlled, observable job if required.
  4. Switch behavior through a feature flag or follow-up release.
  5. Remove obsolete fields only after the rollback window has passed and backups are verified.

Record who runs each migration, how completion is detected, how long it may take, and what the reversal procedure is. A code rollback cannot undo an irreversible schema or content mutation. Backups or provider snapshots are needed for data recovery, and restoring them can itself cause data loss if new production edits are discarded.

Step 7: Gate and promote production releases

Production should not deploy merely because a pull request merged. Add an explicit gate: a manual approval, a scheduled maintenance window, or a change-management control appropriate to the site’s risk.

  1. Confirm staging smoke tests and migration checks are complete.
  2. Review the artifact identifier, changed components, database operations, flags, and rollback plan.
  3. Take or verify a restorable database and file backup according to the host’s capabilities.
  4. Approve deployment of the already-tested artifact; do not rebuild from a moving branch.
  5. Run post-deploy health checks for front-end pages, login, publishing, forms, payments, search, cron, and key integrations.
  6. Monitor logs, response errors, queues, and business metrics during the observation window.

WordPress.com states: “For convenience and maximum control over your production site, we recommend setting up: Manual deployments for production sites. Automatic deployments for staging sites.” That division gives editors and operators a deliberate decision point without slowing every staging test.

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Feature flags and progressive exposure

A feature flag separates code integration from user exposure. The code can be present in trunk and staging while a flag keeps it disabled for visitors. Enable it for internal users, a test cohort, or a limited percentage only when monitoring and rollback are ready.

Use flags responsibly

  • Give each flag an owner, purpose, default value, and removal date.
  • Ensure the disabled path is tested, not just the new path.
  • Avoid putting payment, permission, or data-integrity decisions behind an untested client-side flag.
  • Log flag changes and restrict who can change production values.
  • Remove the flag and dead code after the rollout succeeds.

GitLab documents feature flags and incremental rollouts as release controls, and trunk-based development guidance treats feature flags as a way to integrate incomplete work safely.

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Rollback, recovery, and failure handling

When code is faulty but data is safe

Redeploy the last known-good artifact, invalidate relevant caches, and rerun smoke tests. Keep the failed artifact and logs for diagnosis. Do not rewrite history to hide the bad deployment; make the corrective change through the normal trunk process.

When a migration or content change is harmful

Stop further writes if necessary, follow the documented migration reversal, and use a verified backup or provider snapshot when logical reversal is unsafe. Coordinate the recovery so editors know which content may be lost or need re-entry.

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When staging passes but production fails

Compare environment versions, PHP extensions, secrets, cron configuration, cache layers, traffic-dependent integrations, and production-only data. Record the difference and add a test or parity check before the next release.

Choosing the right level of process

Situation Reasonable starting workflow Add controls when
Small team, low-risk brochure site One trunk, short pull requests, automated build and tests, automatic staging, manual production approval Editors, integrations, or traffic make failures costly
Content-heavy publication Trunk-based code delivery plus explicit production-content synchronization and database backups Multiple editorial teams or frequent schema changes require migration automation
Commerce or membership site Production gate, strong integration tests, feature flags, observability, and tested recovery Use progressive exposure and stricter approvals for payment or identity changes
Large engineering team Required checks, protected trunk, artifact promotion, ownership rules, and documented release windows Coordinate multi-service dependencies and staged rollouts

Evaluate the workflow by merge frequency, branch lifetime, automated coverage, staging fidelity, preview speed, approval time, rollback time, feature-flag capability, and the clarity of code-versus-content responsibilities. There is no authoritative adoption rate or defect-reduction percentage specific to trunk-based WordPress workflows, so choose controls based on your site’s actual failure cost rather than a promised benchmark.

Common mistakes to avoid

  • Using Git as a database backup: Repository history does not restore orders, submissions, or post edits.
  • Long-lived feature branches: They accumulate conflicts and defer integration risk.
  • Rebuilding for each environment: Different dependency resolution can produce different artifacts.
  • Skipping staging because the change is “small”: WordPress hooks, caching, and plugin interactions can make a tiny code change operationally large.
  • Running destructive migrations during deploy: Prefer additive, observable steps with a recovery plan.
  • Leaving flags forever: Stale flags multiply test paths and confuse operators.
  • Putting secrets in workflow files: Use protected secret storage and least-privilege deploy credentials.
  • Assuming rollback means code only: Data changes may require backups or a separately tested reversal.

A practical first implementation

  1. Create a repository containing custom plugins, themes, blocks, build files, tests, and deployment configuration.
  2. Document supported PHP, WordPress, database, Node, and npm versions.
  3. Add a protected trunk and require pull-request review.
  4. Implement CI for linting, dependency installation, asset builds, tests, and security checks.
  5. Publish one build artifact from trunk CI.
  6. Connect the repository to an automatic staging deployment.
  7. Write and automate a smoke-test checklist for the site’s critical paths.
  8. Define database ownership, migration sequencing, backups, and content-refresh rules.
  9. Add a manual production approval and redeploy-based rollback.
  10. Introduce feature flags only where progressive exposure reduces a real release risk, and assign removal dates.

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