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

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

(PHP 5, PHP 7) Fetch DNS Resource Records associated with a hostname

(PHP >= 5.3.0) Gets the host name string gethostname

(PHP 4, PHP 5, PHP 7) Alias of

(PHP 4, PHP 5 < 5.4.0) Initializes all syslog related variables

(PHP 5, PHP 7) Alias of

(PHP 5 >= 5.1.0, PHP 7) Converts a packed internet address to a human readable representation

(PHP 5 >= 5.4.0, PHP 7) Call a header function

(PHP 4, PHP 5, PHP 7) Alias of