(PHP 7) Set system resource limits bool posix_setrlimit

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

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

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

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

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

(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