(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
pcntl_wtermsig — Returns the signal which caused the child to terminate
Returns the number of the signal that caused the child process to
terminate. This function is only useful if
parameter is the status parameter supplied to a successful
call to pcntl_waitpid().
Returns the signal number.
If the functionality is not supported by the OS,
false is returned.