Add a New Custom Field at registration in phpfox

{ // deep_execution_view

const authorName = "Ankit Agrawal";

const publishDate = "July 28, 2014";

(1)go to site admin
http://yoursite.com/index.php?do=/admincp/
(2)now go to
Users > Custom Fields > Add Custom Field
(3)here you can add custom fields
(4)save and clear cache

}