Changes the root directory of the current process to directory. Zwraca TRUE w przypadku sukcesu, FALSE w przypadku porażki..
Notatka: It's not wise to use this function when running in a webserver environment, because it's not possible to reset the root directory to / again at the end of the request. This function will only function correct when you run PHP as command line too. (CLI)
Notatka: Ta funkcja nie jest dostępna na platformie Windows.