PHP. Руководство по PHP. 2005
pcntl_wexitstatus
pcntl_wexitstatus
Description
int pcntl_wexitstatus (int status)Returns the return code of a terminated child. This function is only useful if pcntl_wifexited() returned TRUE.
Параметр status - это
переменная, переданная по ссылке в функцию pcntl_waitpid().
See also pcntl_waitpid() and pcntl_wifexited().
pcntl_waitpid
pcntl_wifexited