thank you for sharing the static binary and explanation .
i am using musl to do static binary build and able to get most of the binary in static build. It is only when i try to compile php using musl gcc that i run into problem. i assume you are using gcc to create these static binary ?

May i know are you able to share tutorial on how to compile php into static binary build and your email contact . i can follow up on question in regard to compilation privately rather post on public message board.