Online PHP editor | rfc for ejrVt

@ 2022-05-10T07:50:51Z

<?php
class Str {
    /** PHPの組み込み関数の第一引数に使う値をプロパティとしてセット */
    public function __construct(
        public string $str
    ){}

    /**
     * このクラスで外部に公開していない名前のメソッドが呼ばれた場合に動作するマジックメソッド
     * @see https://www.php.net/manual/ja/language.oop5.overloading.php#object.call
     */
    public function __call($name, $arguments)
    {
        // 呼ばれたメソッド名の関数を第一引数を最初に与えたプロパティ、
        // 第二引数以降を呼ばれた際の引数として実行
        $result = $name($this->str, ...$arguments);
        // 関数の返り値が文字列ならば返り値を元に自身のインスタンスを生成して返却
        // 関数の返り値が文字列でないならば返り値をそのまま返却
        return is_string($result) ? new self($result) : $result;
    }
}
$s = new Str('hoge');
echo $s->substr(0, 2)
    ->strtoupper()
    ->str_pad(4, '0', STR_PAD_LEFT)
    ->str;
    // 00HO

Output for git.master, git.master_jit, rfc.property-hooks: 00HO

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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