PHP fork process - getting child output in parent

Question

I want to achieve the following:

Initialize an array. Child process adds some elements to the array. Parent process adds some elements to the array. Finally before

Answer 1

(sorry for crossposting)

I suggest a look at socket_create_pair().

In the PHP manual is a very short & easy example of interprocess communication (IPC) between a fork()-parent and the child.

And using serialize() und unserialize() You could even transfer complex data types like arrays...