I see similar parallels, but where as PHP shared hosting often meant one server handling multiple sites upon request, FaaS seems to be more generic with multipl

I see similar parallels, but where as PHP shared hosting often meant one server handling multiple sites upon request, FaaS seems to be more generic with multiple (virtual) server instances handling multiple site functions upon request. So while each site was a PHP monolith on shared hosting, a FaaS architecture could be many smaller units of code, spun up on demand to handle a specific need of a service, possibly across multiple servers.