(PHP 4 >= 4.1.0, PHP 5, PHP 7) Shuts down a socket for receiving, sending, or both

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Opens a socket on port to accept connections

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

(PECL geoip >= 1.0.1) Determine if GeoIP Database is available

(PHP 5 >= 5.4.0, PHP 7) Get or Set the HTTP response code

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

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

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

(PHP 4, PHP 5, PHP 7) Decodes data encoded with MIME base64

(PECL ssh2 >= 0.9.0) Connect to an SSH server