Online PHP editor | rfc for 9MjGI

@ 2022-04-26T05:06:28Z

<?php

interface HasMethodReturnIntOrString
{
    public function methodA(): int|string;
}
interface HasMethodReturnIntOrFloat
{
    public function methodA(): int|float;
}

/**
 * 返り値が int|string 型であるメソッド methodA の実装を約束するインターフェイスと
 * 返り値が int|float 型であるメソッド methodA の実装を約束するインターフェイスの
 * 両方を実装するクラス
 */
class HasMethodReturnInt implements HasMethodReturnIntOrString, HasMethodReturnIntOrFloat
{
    /**
     * 返り値が int|string 型 と int|float 型の両方を満たすメソッド
     * つまり (int|string) & (int|float) の計算結果である int 型の値を返すメソッド
     * @return int
     */
    public function methodA(): int
    {
        return 0;
    }

//   片方の型を満たせない場合↓の様にPHPがエラーを出力します
//   Fatal error: Declaration of HasMethodReturnInt::methodA(): string must be compatible with HasMethodReturnStringOrFloat::methodA(): int|float in ***\tmp.php on line 28
//    public function methodA(): string|int
//    {
//        return 0;
//    }
}

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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