数据库字段的依赖性

public function getUser($id) {
    $user = $this->db->getSingleRecord(\"SELECT user_id,  user_login, user_email FROM users WHERE user_id = ?\", $id);

    return $user;
}

login: {$user[\'user_login\']|escape} <br />

public function getUser($id) {
    $user = $this->db->getSingleRecord(\"SELECT user_id,  user_login, user_email FROM users WHERE user_id = ?\", $id);

    if (empty($user))
      // return empty array
      return $user;
    else
      return array(\'user_id\' => $user[\'user_id\'], \'user_login\' => $user[\'user_login\'], \'user_email\' => $user[\'user_email\']);
}