shared memory? Does it exist in PHP?

I have an architectural question. Does Codeigniter or PHP have any functionality for interprocess communication? Here is what I mean by this. I am spawning multiple copies of a controller called back_end. Each time a message comes over CORs I spawn a controller  by sending https://URL/back_end/myFunc().  They start up fine, do their thing, and go away. I'd like each of those copies to be able to read and write a single area of shared ram (the way we used to do it in the mini days). My server, btw is running Ubuntu. 

Now I could get use linked list built in shared Ram or maybe another one of the other IP communication constructs.

proof that an old dog can learn new tricks