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

(PHP 7) Set system resource limits bool posix_setrlimit

(PHP 5 >= 5.1.0, PHP 7) Determine accessibility of a file

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

(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) Alias of

(PHP 4, PHP 5, PHP 7) Pathname of current directory

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

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