The problem
PHP applications on IIS need a working FastCGI handler and a PHP build compatible with the server.
Recommended approach
Use a supported PHP build, configure FastCGI and verify with a minimal phpinfo or CLI test before troubleshooting the application.
Step-by-step checklist
- Confirm PHP architecture matches IIS/PHP requirements.
- Install the required runtime dependencies.
- Configure FastCGI handler.
- Test a minimal PHP page.
- Review IIS and PHP logs for application errors.
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