Generate Users List per site for WPMU

gistfile1.php

function tell_all() {
    global $wpdb;
    $all_sites = $wpdb->get_col( "SELECT blog_id FROM {$wpdb->blogs} WHERE archived = FALSE" ); // Hide archived sites
    $list = array();
    foreach( $all_sites as $site ) {
        $args = array(
            'blog_id' => $site,
            'fields' => 'user_email',
            'role' => 'Editor',
        );
        $url = get_blogaddress_by_id( $site );
        $list[$url] = array();
        $editors = get_users( $args );
        $args['role'] = 'Administrator';
        $administrators = get_users( $args );
        $users = array_merge( $editors, $administrators );
        foreach( $users as $user ) {
          $user_info = get_userdata($user);
  $user_name = $user_info->display_name;
  $user_email = $user_info->user_email;
  $user_roles = implode(', ', $user_info->roles);
  $user_roles = $user_roles ? '['.$user_roles.']' : '';
            $list[$url][$user] = $user_name .", ". $user_email . $user_roles;
        }

    }
    return $list;
}
$list = tell_all();

$sites = array_keys($list);

$i = 1;
echo '<table>';
foreach ($sites as $site) {
    echo '<tr>';
    echo '<td>'.$i.'</td>';
    echo '<td>'.$site.'</td>';
    echo '<td>';
    foreach($list[$site] as $users){
      echo $users.'</br>';
    }
    echo '<td>';
    echo '</tr>';
    $i++;
}
echo '</table>';

The user information could include link to email, etc.

Based on https://wordpress.stackexchange.com/questions/101043/generate-a-user-list-per-site-to-communicate-upgrade-plans