PHP2Shell, made public on 21 October 2026, is two critical flaws in PHP that can allow unauthenticated code execution, and the first known attempt came on 17 October, before the patch. Fixed builds exist only for PHP 8.2 onward. Don't worry: we can rebuild your PHP API in FastAPI and have it serving traffic in 7 days. See the PHP2Shell news story.
Our PHP to FastAPI migration services in USA and UK companies need are built for one job: turning a PHP back end into a fast, typed JSON API. FastAPI is a modern Python framework where you describe each request and response with Pydantic models and Python type hints. From those, it validates input, converts types, and writes interactive OpenAPI documentation at /docs automatically.
It also runs on ASGI with native async and await. An endpoint that calls a payment provider, a search service and the database can do so without tying up a worker, and Uvicorn serves many concurrent requests on modest servers. That makes FastAPI a natural back end for mobile apps, React or Vue front ends, partner integrations and AI features that call model APIs.
Techno Mantraa has more than a decade of web development experience. We work from India on hours that overlap the United States and the United Kingdom, set a fixed price up front and hand over a FastAPI service with tests and live docs.
Why FastAPI for your PHP API
FastAPI is focused. It does not try to render your whole website or give you an admin panel. If your PHP app mostly answers API calls, that focus is exactly what you want.
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: Catalogue the API
We list every PHP endpoint with its inputs, outputs and error cases, then agree scope and a fixed price.
Days 2-4: Write path operations
We define Pydantic schemas, connect SQLAlchemy to your database, and build endpoints with 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
We put FastAPI behind your API domain, keep the PHP service ready as a fallback, and watch latency and errors.
PHP API vs FastAPI
The biggest change is that types now drive validation, docs and editor help all at once.
| 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
We keep your API contract exactly as it is today, field names and status codes included, so no client app needs an update on launch day.
We tell you when FastAPI is the wrong tool
If you also need server-rendered pages and a staff admin, Django usually fits better. We point that out in the audit rather than forcing FastAPI onto every job.
Fixed price agreed before any build work starts.
NDA signed before code or API keys are shared.
FastAPI migration for USA and UK product teams
This service targets small and mid-sized companies in the United States and United Kingdom whose mobile app, SaaS product or partner integrations depend on a PHP API. We overlap the US Eastern morning and UK office hours, and every message gets an answer the same day.
Working with our offshore team in India means a FastAPI rebuild for a fraction of local rates, plus an NDA, a fixed price and one manager responsible for delivery.
Official sources: PHP supported versions · FastAPI
Frequently asked questions
Straight answers about our PHP to FastAPI Migration service.
For most small and medium PHP APIs, we finish in 7 days: one day to catalogue, three to build, two to test and launch on day seven. Very large APIs get a phased plan, with the first group of endpoints live within the same 7 days.
No. We keep URLs, field names, status codes and auth the same, and we test the new FastAPI responses against the PHP ones before launch, so existing app versions keep working.
Yes. With Uvicorn and async endpoints it handles high request volumes, and it is used in production by many large companies. For most APIs the database is the real limit, and we tune queries too.
FastAPI for a pure API with heavy outside calls or AI features. Django when you also need web pages, forms and a ready admin panel. We recommend one after reading your code.
Yes, once the PHP server is shut down. PHP2Shell is in the PHP engine and FastAPI runs on Python. We keep Python, FastAPI and their dependencies on supported versions.
Yes. We take FastAPI projects from across the United States and United Kingdom, work on overlapping hours, reply the same day and work to a fixed price under an NDA.
Is your PHP app still on an old version?
Send us the URL or the repository. We check it for the PHP2Shell flaw and old code for free, and tell you what a 7-day migration looks like.
Get a free migration audit