(PHP 4 >= 4.3.0, PHP 5, PHP 7) Get current buffer contents and delete current output buffer

(PHP 4, PHP 5, PHP 7) Turn on output buffering

(PHP 4, PHP 5, PHP 7) Send a raw HTTP header

(PHP 4, PHP 5, PHP 7) Get port number associated with an Internet service and protocol

(PHP 5 >= 5.5.0, PHP 7) Send a message int

(PECL ssh2 >= 0.9.0) Retrieve fingerprint of remote server

(PHP 4, PHP 5, PHP 7) Clean (erase) the output buffer and turn off output buffering

(PHP 4, PHP 5, PHP 7) URL-encode according to RFC 3986

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Sets socket options for the socket

(PECL ssh2 >= 0.9.0) Execute a command on a remote server