(PHP 4 >= 4.1.0, PHP 5)
Returns the number of the signal that caused the child process to terminate. This function is only useful if pcntl_wifsignaled() returned TRUE.
The parameter status is the status parameter supplied to a successfull call to pcntl_waitpid().
See also pcntl_waitpid(), pcntl_signal() and pcntl_wifsignaled().