int
run(callable|null $callback = null)
Runs the process. The callback receives the type of output (out or err) and some bytes from the output in real-time. It allows to have feedback from the independent process during execution. The STDOUT and STDERR are also available after the process is finished via the getOutput() and getErrorOutput() methods.
Parameters callable|null $callback A PHP callback to run whenever there is some output available on STDOUT or STDERR Return Value