Signals a process (created using
proc_open()) that it should terminate.
proc_terminate() returns immediately and does not wait
for the process to terminate.
proc_terminate() allows you terminate the process and
continue with other tasks. You may poll the process (to see if it has
stopped yet) by using the proc_get_status() function.
However this is only possible with PHP 5.2.2 or newer, as previous versions
destroyed the given process resource.
processThe proc_open() resource that will be closed.
signalThis optional parameter is only useful on POSIX operating systems; you may specify a signal to send to the process using the kill(2) system call. The default is SIGTERM.