(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5, PHP 7) Reads bytes from a file descriptor

(PHP 4 >= 4.3.0, PHP 5 <= 5.0.5, PHP 7) Sets terminal attributes and baud rate for a serial port

(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5, PHP 7) Gets stat information about the file descriptor fd

(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5, PHP 7) Writes data to fd with optional truncation at length

(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5, PHP 7) Closes the file descriptor given by fd

(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5, PHP 7) Opens a file (creating it if necessary) at a lower level than

(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5, PHP 7) Performs a c library fcntl on fd

(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5, PHP 7) Seeks to pos on fd from whence

(PHP 4 >= 4.2.0, PHP 5 <= 5.0.5, PHP 7) Truncates file descriptor fd to offset bytes