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PHP final定義

Last updated at Posted at 2022-03-11

finalメソッド・final定数

PHPにおいて、finalで定義されたメソッドや定数は子クラスから上書きできない。

<?php
class BaseClass
{
  final function hoge()
  {
    // 処理
  }
}

class ChildClass extends BaseClass
{
  public function hoge() 
  {
    // 上書き処理
  }
}

// Results in Fatal error: Cannot override final method
// finalメソッドを上書きできない

finalクラス

final定義されたクラスは継承することができなくなる。

final class HogeClass
{
  // クラス内容
}

class ChildClass extends HogeClass
{
  // クラス内容
}

// Results in Fatal error: Class ChildClass may not inherit from final class (HogeClass)
// finalクラスは継承できない

参考

PHP: finalキーワード

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