DNS Functions

One of the wonderful things about PHP is the large amount of useful functions that it contains , here we will look at a couple of DNS functions . gethostbyaddr() and gethostbyname() . Unlike other languages you dont need a third party component in PHP .

gethostbyaddr() example

This example gets the Internet host name corresponding to a given IP address . We are getting the IP address of whoever is looking at the page .

<?php
$ip = gethostbyaddr($REMOTE_ADDR);
echo $ip;
?>

and here is the result

38.103.63.59

gethostbyname() example

With this function we get the IP address corresponding to a given Internet host name , in this example www.microsoft.com and get the ip address of it.

<?php
$ipaddress = gethostbyname("www.microsoft.com");
echo "$ipaddress";
?>

and here is the result

207.46.19.254