How to list all registered users on your wordpress site
In my latest project i was required to add a community touch to a site by listing the Name, Email, Nickname, URI and Gravatar of all the registered users on the site. I came with the following solution : I made a new page template called users and added the following lines of php to the template :
/*
First we set how we’ll want to sort the user list.
* ID – User ID number.
* user_login – User Login name.
* user_nicename – User Nice name ( nice version of login name ).
* user_email – User Email Address.
* user_url – User Website URL.
* user_registered – User Registration date.
*/
$sort= "user_registered";
//the default avatar to display in case gravatar is not available for a user
$default = "http://www.somewhere.com/some-directory/some-image.png";
//the size of the gravatar , here 96px
$size = 96;
//Build the custom database query to fetch all user IDs
$all_users_id = $wpdb->get_col( $wpdb->prepare(
"SELECT $wpdb->users.ID FROM $wpdb->users ORDER BY %s ASC"
, $sort ));
//we got all the IDs, now loop through them to get individual IDs
foreach ( $all_users_id as $i_users_id ) :
// get user info by calling get_userdata() on each id
$user = get_userdata( $i_users_id );
//GETTING INFO FROM EACH USERS
//get the user’s email ID
$email = $user->user_email;
//build the gravatar URL
$grav_url = "http://www.gravatar.com/avatar.php?
gravatar_id=".md5( strtolower($email) ).
"&default=".urlencode($default).
"&size=".$size;
//get the user’s full name
$user_fullname=$user->first_name . ‘ ‘ . $user->last_name;
//get the user’s URI
$user_url=$user->user_url;
//get the user’s nickname
$user_nickname=$user->nickname;
//get the user’s description ( the biographical info field, )
$user_profile=$user->description;
?>
<!– Now here you can display each users info using the variables defined above –>
<?php
endforeach; // end the users loop.
?>
Hope you found it useful, cheers 
, WORDPRESS ROCKS
