( resource process [, int signal] )
Signals a process (created using
proc_open()) that it should terminate.
proc_terminate() returns immediately and does not wait
for the process to terminate.
signal 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
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.