I'm trying to implement this on my existing project but i get this error: <img width="479" alt="Screenshot 2024-01-04 at 11 35 48" src="https://github.com/bufferhead-code/nextjs-use-php/assets/128377763/d5606b92-46bf-4ef9-821d-3da89a547508"> How do i enable 'use php' directive in my existing project? Does this really work or its a kind of a joke? Can i run cURL in here? Can i use this in my production app hosted on vercel?