The Symfony Process Component helps with executing commands in sub-processes by providing easy access to standard and error output in real-time. It is especially handy for dealing with long running sub-processes due to its feature to run them asynchronously, while still providing access to their full and incremental output. It additionally supports signals, provides the PID of a sub-process and allows the definition of process timeouts.

Symfony is a PHP framework, a set of tools and a development methodology.