(PHP 5 >= 5.2.1, PHP 7) Shutdown a full-duplex connection

(PHP 5, PHP 7) Accept a connection on a socket created by

(PHP 5 >= 5.1.0, PHP 7) Creates a pair of connected, indistinguishable socket streams

(PHP 5, PHP 7) Retrieve the name of the local or remote sockets

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Retrieves header/meta data from streams/file pointers