PHP2Shell, made public on October 21, 2026, is two critical flaws in PHP rated 9.2 on CVSS v4.0. An exploit attempt was recorded four days before the patch, and official fixes ship only for PHP 8.2 onward. A FastAPI rebuild moves your API off PHP entirely, and most small and mid-sized APIs serve traffic within 7 days. See the PHP2Shell news story.
PHP to FastAPI migration services for US companies do one job: turn a PHP back end into a fast, typed JSON API. In FastAPI, a modern Python framework, each request and response is described with Pydantic models and type hints. From those, the framework validates input, converts types and publishes interactive OpenAPI documentation at /docs automatically.
FastAPI runs on ASGI with native async and await. One endpoint can call a payment provider, a search service and the database without tying up a worker, and Uvicorn serves many concurrent requests on modest servers. The same design suits back ends for mobile apps, React or Vue front ends, partner integrations and AI features that call model APIs.
Techno Mantra is an AI and web development company that builds AI applications, websites, SEO programs and custom CRM systems for businesses in the US, Canada and Australia. The handover is a FastAPI service with tests and live docs, priced before work starts.
Why FastAPI for your PHP API
If your PHP app mostly answers API calls, FastAPI fits. It makes no attempt to render a full website or supply an admin panel, so your codebase stays API only.
Validation from type hints
A Pydantic model defines the shape of each request once. Bad input gets a clear 422 error automatically, with no hand-written checks in each endpoint.
Docs that never go stale
Swagger UI and ReDoc pages are generated from the code, so your mobile team and partners always see the real, current API.
Async for slow outside calls
Endpoints that wait on third-party APIs or AI models can await them, so one slow provider does not block every other user.
What we deliver in FastAPI
- Every PHP endpoint rewritten as a FastAPI path operation
- Pydantic models for all request bodies and responses
- Database access with SQLAlchemy 2.0 or SQLModel on your existing tables
- Schema changes managed with Alembic migrations
- OAuth2 password flow with JWT tokens, keeping existing password hashes
- Shared logic such as auth and database sessions through FastAPI dependencies
- Background tasks or Celery workers for emails and long jobs
- Uvicorn or Gunicorn deployment in Docker with health checks
Seven days from PHP to FastAPI
Day 1: Catalog the API
Every PHP endpoint is listed with its inputs, outputs and error cases, then you confirm scope and price.
Days 2-4: Write path operations
Developers define Pydantic schemas, wire SQLAlchemy to your database and build endpoints, using async where it helps.
Days 5-6: Contract testing
pytest with HTTPX calls both APIs and compares the JSON, so mobile and front-end clients see no difference.
Day 7: Cut over
FastAPI takes over your API domain, the PHP service stays ready as a fallback, and latency and errors are tracked.
PHP API vs FastAPI
The biggest change: one set of type hints drives validation, docs and editor help.
| PHP API | FastAPI | |
|---|---|---|
| Input validation | Manual checks or a validation library | Automatic from Pydantic models |
| API documentation | Separate file, often outdated | OpenAPI, Swagger UI and ReDoc built in |
| Concurrency | One blocking worker per request | Async endpoints on an ASGI server |
| Dependencies | Globals or a service container | Depends() functions per endpoint |
| Server | PHP-FPM with Nginx or Apache | Uvicorn, often behind Nginx |
| Best fit | Pages and APIs mixed together | JSON APIs for apps, partners and AI features |
Why our team for FastAPI
Your API contract stays exactly as it is today, field names and status codes included, so no client app needs an update on launch day.
When FastAPI is the wrong choice
Django usually fits better when you also need server-rendered pages and a staff admin, and the audit says so instead of forcing FastAPI onto every job.
Fixed price agreed before any build work starts.
NDA on request before sharing code or API keys.
FastAPI migration for US product teams
This service targets small and mid-sized companies in the United States whose mobile app, SaaS product or partner integrations depend on a PHP API. Calls run during US Eastern hours, and each message is answered within one business day.
One manager owns delivery from catalog to cutover, backed by a team with 5,000+ projects delivered. The code, designs and accounts stay yours.
Official sources: PHP supported versions · FastAPI
Frequently asked questions
Straight answers about our PHP to FastAPI Migration service.
Most small and medium PHP APIs move in 7 days: one day to catalog, three to build, two to test, then launch. Large APIs follow a phased plan that puts the first group of endpoints in production by day seven.
No. Every URL, field, response code and login flow stays as it is, and the FastAPI responses are tested against the PHP ones before launch, so existing app versions keep working.
Yes. On Uvicorn with async endpoints it handles high request volumes. For most APIs the database sets the limit, so slow queries get tuned as part of the rebuild.
FastAPI for a pure API with heavy outside calls or AI features. Choose Django if pages, forms and a ready admin panel matter too. A read of your code decides.
Yes, once the PHP service is switched off. The flaws sit in the PHP engine, FastAPI runs on Python, and Python, FastAPI and their dependencies stay on supported versions.
Yes. FastAPI projects come from across the United States. Calls overlap US Eastern hours, the price is fixed, and an NDA is signed when you ask.
Is your PHP app still on an old version?
Send the URL or repository, under NDA if needed. The audit checks for the PHP2Shell flaw and outdated code and shows what a 7-day migration looks like.
Request a migration audit