PHP would serve WordPress when it's run as a standalone Wasm application.

Wasm container images are much smaller than the traditional ones. Even the alpine version of the php container is bigger than the Wasm one.

With WASI SDK we can build a Wasm module out of PHP's codebase, written in C. After that, it takes a very simple Dockerfile based on scratch for us to make an OCI image that can be run with Docker+Wasm.

Docker Desktop now includes support for WebAssembly. It is implemented with a containerd shim that can run Wasm applications using a Wasm runtime called WasmEdge. This means that instead of the typical Windows or Linux containers which would run a separate process from a binary in the container image, you can now run a Wasm application in the WasmEdge runtime, mimicking a container. As a result, the container image does not need to contain OS or runtime context for the running application - a single Wasm binary suffices.