(PHP 4, PHP 5, PHP 7) Return the current process identifier

(PHP 4, PHP 5, PHP 7) Return info about a group by name

(PHP 4, PHP 5, PHP 7) Get process times array

(PHP 4, PHP 5, PHP 7) Return info about a user by username

(PHP 4, PHP 5, PHP 7) Return info about a user by user id

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

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

(PHP 4, PHP 5, PHP 7) Return the parent process identifier

(PHP 4, PHP 5, PHP 7) Determine if a file descriptor is an interactive terminal

(PHP 4, PHP 5, PHP 7) Return login name string