Not intended as a plug but you can even use php for network automation. I cobbled this together:

https://github.com/epiecs/phpmiko for connecting to devices and https://github.com/epiecs/mikodo for inventories and concurrency

The multi core coroutines comment is true but there are ways (to hack) around that.

The way I solved concurrency is just by forking and using sockets: https://github.com/epiecs/mikodo/blob/6bdcebe9fa7f44ffdedd82...

I use it at work atm does what it's supposed to. I also use Python as well but I wanted to know if it could be done in php :D