PHP スキル: PHP プログラム内の一部の悪いコードを賢く回避する方法

class User {
  public $username;
  public $password;
  
  public $otherInfo = [];
  
  
  public function readUserInfo() {
    return [
      'username' => $this->username,
      'password' => $this->password,
    ];
  }
  
  public function addAtri($info) {
    array_push($this->otherInfo, $info);
  }
}

$user = new User();
$user->userRealName = "hello world";

 class WebOperate {
   public function doOprate(User $user) {
     $user->userRealName = "hello world";
     next($user);
   }
 }

 class IndexController {
   public function index(User $user) {
     return $user->userRealName;
   }
 }

 class Teacher extends User {
   public function sayHello() {
     return "hello world";
   }
 }

 class IndexController {
   public function index(Teacher $user) {
     return $user->userRealName;
   }
 }

class WebOperate {
  public function doOprate(User $user) {
    $user->addAtri([
      'userRealName' => 'hello world',
    ]);
    next($user);
  }
}

public function addNewUser() {
    $res = $this->addData();
    if ($res) {
      return true;
    } else {
      return [
        'error' => 1,
        'errormsg' => "没有添加成功"
      ];
    }
  }

class Operate{
  public $operateRes = [
    0 => '成功',
    1 => '添加失败',
    2 => '未知错误',
  ];
  
  
  public function addNewUser() {
    $res = $this->addData();
    if ($res) {
      return 0;
    } else if ($res > 1) {
      return 1;
    }
    return 2;
  }
  
}

$opera = new Operate();
$res = $opera->addNewUser();
return $opera->operateRes[$res];

class Operate{
  public function addNewUser() {
    $res = $this->addData();
    $result = new Result();
    if ($res) {
      $result->errno = 0;
      $result->errmsg = "成功";
    } else if ($res > 1) {
      $result->errno = 1;
      $result->errmsg = "失败";
    }
    $result->errno = 2;
    $result->errmsg = "未知错误";
    return $result;
  }
  
}

class Result {
  public $errno;
  public $errmsg;
}