Write a PHP function 'getTLD' that accepts a domain name (such as www.google.com) as a single string argument and returns the top-level domain, the right-most portion, of that domain (com).

Note that fully qualified domains actually end in a period (www.google.com.). It is optional when displayed and often not included. Your fuction, however, should account for this as shown in the third example.

getTLD("iit.edu"); // returns "edu" getTLD("www.bob.smith.info"); // returns "info" (even though it is not just three characters) getTLD("w3.org."); // returns "org" (without the trailing period)