(PHP 4, PHP 5, PHP 7) Return the current process group identifier
(PHP 4, PHP 5, PHP 7) Set the UID of the current process
(PHP 5 >= 5.1.0, PHP 7) Create a special or ordinary file (POSIX.1)
(PHP 4, PHP 5, PHP 7) Get system name array posix_uname
(PHP 4, PHP 5, PHP 7) Return the effective user ID of the current process
(PHP 5 >= 5.1.0, PHP 7) Determine accessibility of a file
(PHP 4, PHP 5, PHP 7) Return the real group 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 4, PHP 5, PHP 7) Set the GID of the current process
(PHP 5 >= 5.2.0, PHP 7) Calculate the group access list
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