(PHP 3 >= 3.0.13, PHP 4, PHP 5)
Returns the login name of the user owning the current process. See posix_getpwnam() for information how to get more information about this user.
Note that this function returns the owner that the process *started* as. Even if you call posix_setuid (or posix_seteuid) it will still report the username the process started as. use get_current_user() to get the effective real user.