tbartels

<?php
// Force update our username (user_login)
global $wpdb;	

// method 1
#$sql = $wpdb->prepare("UPDATE {$wpdb->users} SET user_login = %s WHERE ID = %d", $user_email, $user_id);
#$wpdb->query($sql);    
// method 2
$wpdb->update($wpdb->users, array('user_login' => $user_email), array('ID' => $user_id));