Piwik\Plugins\UsersManager\Model::updateUserFields PHP Method

    private function updateUserFields($userLogin, $fields)
    {
        $set = array();
        $bind = array();
        foreach ($fields as $key => $val) {
            $set[] = "`{$key}` = ?";
            $bind[] = $val;
        }
        $bind[] = $userLogin;
        $db = $this->getDb();
        $db->query(sprintf('UPDATE `%s` SET %s WHERE `login` = ?', $this->table, implode(', ', $set)), $bind);
    }