(PHP 4, PHP 5, PHP 7) Return the group set of the current process

(PHP 4, PHP 5, PHP 7) Set the UID of the current process

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Alias of

(PHP 4, PHP 5, PHP 7) Set the GID of the current process

(PHP 4, PHP 5, PHP 7) Return the effective user ID of the current process

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Retrieve the system error message associated with the given errno

(PHP 5 >= 5.2.0, PHP 7) Calculate the group access list

(PHP 4, PHP 5, PHP 7) Get system name array posix_uname

(PHP 5 >= 5.1.0, PHP 7) Create a special or ordinary file (POSIX.1)

(PHP 4, PHP 5, PHP 7) Return the real group ID of the current process