On 21 October 2026 two critical PHP engine flaws, together known as PHP2Shell, were disclosed with a 9.2 severity score. Every PHP version back to 5 is affected, and anything below 8.2 has no official fix, which leaves many older business apps exposed. Don't worry: we rebuild your PHP app on ASP.NET Core and take it live in 7 days. Read the full news story.
Our PHP to .NET migration services in USA and UK organisations are for businesses that have standardised on Microsoft. Your staff sign in with Microsoft 365, your data sits in SQL Server or Azure, and the one PHP app on a Linux box is the odd one out that nobody in IT wants to own. Moving it to .NET puts it on the same stack as everything else.
We rebuild the app in C# on ASP.NET Core, using a current long-term support release of .NET. Pages become Razor Pages or MVC views, or the back end becomes a Web API for an existing front end. Data moves through Entity Framework Core with code-first migrations, and staff log in with Microsoft Entra ID through the standard OpenID Connect middleware.
Techno Mantraa has more than a decade of web development experience. Our team in India keeps hours that cross over with the US East Coast and the UK, so your IT lead can reach us during the working day.
Why Microsoft shops move PHP apps to .NET
ASP.NET Core is open source, cross-platform and among the fastest mainstream web frameworks. For a company already paying for Microsoft tools, it also cuts the number of things IT has to support.
Single sign-on with Entra ID
Staff use the same Microsoft account they already have. Leavers lose access the moment IT disables them, with no separate PHP user list to forget.
One stack for IT to support
C#, Visual Studio, SQL Server and Azure DevOps are tools your team already knows, so patching, backups and audits follow one process.
Strong typing and tooling
C# catches type mistakes at build time, and Visual Studio or Rider make large refactors safe instead of guesswork.
What we rebuild in .NET
- PHP pages rebuilt as Razor Pages, MVC views or a Web API
- Database moved to Entity Framework Core, MySQL data migrated to SQL Server if you want
- Staff login through Microsoft Entra ID, customer login through ASP.NET Core Identity
- Existing password hashes verified on first login and upgraded in place
- Scheduled PHP scripts turned into hosted background services or Azure Functions
- Reports, PDFs and Excel exports
- Tests with xUnit for business rules
- Deployment to Azure App Service, IIS or Linux containers
Your 7-day PHP to ASP.NET Core schedule
Day 1: Inventory
We list each PHP page, form, table and job, note how users sign in today, and agree a fixed scope and price.
Days 2-4: Build in C#
ASP.NET Core project, EF Core models and migrations, then each module ported with its rules and validation.
Days 5-6: User testing
Your staff try the .NET version on a staging slot with their Microsoft logins while we check data and reports against PHP.
Day 7: Go live on your stack
We swap the staging slot into production on Azure or your IIS server, keep URLs where possible and stay on watch.
PHP app vs ASP.NET Core app
How the app looks to your IT team before and after.
| PHP app | ASP.NET Core app | |
|---|---|---|
| Sign-in | Separate username and password list | Microsoft Entra ID single sign-on |
| Language | PHP, often untyped | C# with full type checking |
| Database | MySQL with raw queries | EF Core on SQL Server, Azure SQL or MySQL |
| Hosting | A Linux server IT does not manage | Azure App Service, IIS or containers |
| Support | Old PHP release with no fixes | Microsoft support policy with LTS releases |
| Tooling | Basic editor | Visual Studio, Rider and Azure DevOps |
Why pick us for PHP to .NET
We read PHP well and write C# well, which is the mix this job needs.
No surprises for your staff
Screens, fields and reports stay where people expect them, so the switch to .NET feels like a login change, not new software to learn.
Free audit, then a fixed price that does not grow mid-project.
NDA before access, and all code delivered to your own repo.
PHP to .NET for American and British businesses
This offer is meant for firms in the United States and the United Kingdom that run on Microsoft 365 and Azure but still carry a PHP intranet, portal or line-of-business tool. We work in a window that meets US Eastern and UK office hours and reply on the same day.
Local .NET contractors charge high day rates. Our offshore team is far cheaper, agrees a fixed price up front, works under NDA and gives you one contact for the whole move.
Official sources: PHP supported versions · .NET (Microsoft)
Frequently asked questions
Straight answers about our PHP to .NET Migration service.
Most small and medium PHP apps are rebuilt on ASP.NET Core in 7 days. For very large systems we agree a phased plan, and the first part goes live within the same 7 days.
No. Modern .NET runs on Linux too. We can host on Azure App Service, IIS, Linux containers or your existing cloud, whichever your IT team prefers.
Yes. EF Core supports MySQL through a provider. Many clients take the chance to move to SQL Server or Azure SQL, but it is your choice.
It may not be. If your team lives on Linux and open-source tools, Laravel, Node.js or a PHP 8.4 upgrade may fit better. We say so in the audit.
Yes. Once live, the app runs on .NET with no PHP engine, so PHP2Shell does not apply. We also remove PHP from the old server after launch.
Yes. We plan around US Eastern and UK hours, answer the same day, sign your NDA and work for a fixed price with one project lead.
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