Extend or remove some fields in User Profiles

WordPress user profiles include several contact fields (e-mail address, a URL, AIM, Yahoo, and Google Talk) and these built-in contact fields are not always useful. It is possible to extend or remove some fields with just a few lines of code in functions file. In the following code we will add a Twitter field and remove AIM, Yahoo IM, Google Talk/Jabber.

// Change user contact fields profile
function change_user_profile( $contactmethods ) {
// Add Twitter field
$contactmethods['twitter'] = 'Twitter Name (no @)';
// Remove AIM, Yahoo IM, Google Talk/Jabber
unset($contactmethods['aim']);
unset($contactmethods['yim']);
unset($contactmethods['jabber']); 

return $contactmethods;
}
add filter('user contactmethods','change_user_profile',10,1);