(PHP 4 >= 4.1.0, PHP 5, PHP 7) Return a string describing a socket error

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Sends data to a connected socket

(PHP 4, PHP 5, PHP 7) Turn implicit flush on/off

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

(PECL ssh2 >= 0.9.0) Return list of negotiated methods

(PHP 4, PHP 5, PHP 7) Get protocol number associated with protocol name

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Create a socket (endpoint for communication)

(PECL geoip >= 1.0.2) Get the Internet Service Provider (ISP) name

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Flush (send) the output buffer

(PHP 4, PHP 5, PHP 7) Decodes URL-encoded string