(PHP 5 >= 5.4.0, PHP 7) Set the stream chunk size

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

(PHP 5 >= 5.1.0, PHP 7) Turns encryption on/off on an already connected socket

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

(PHP 5 >= 5.1.0, PHP 7) Restores a previously unregistered built-in wrapper