(PECL geoip >= 0.2.0) Get the two letter country code

(PECL geoip >= 1.0.4) Returns the time zone for some country and region code combo

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

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

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Return the nesting level of the output buffering mechanism

(PHP 5, PHP 7) Send a cookie without urlencoding the cookie value

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

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

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

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Accepts a connection on a socket