(PHP 4, PHP 5, PHP 7) Return the current process group identifier
(PHP 4, PHP 5, PHP 7) Determine if a file descriptor is an interactive terminal
(PHP 4, PHP 5, PHP 7) Pathname of current directory
(PHP 5 >= 5.2.0, PHP 7) Calculate the group access list
(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) Return the real group ID 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 >= 5.1.0, PHP 7) Create a special or ordinary file (POSIX.1)
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