Waiting, Terminating, And Killing

By default all background processes register a shutdown function that forces the PHP script to wait for job to complete before shutting down. You can call ->wait() on a Process instance if you need to wait until it has finished.

You can also use ->terminate() and ->kill() on a Process to send terminate and kill signals.

->wait(), ->terminate(), and ->kill() are also available on the Manager instance and will wait for, terminate, or kill every process.