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run code in 500+ PHP versions simultaneously

@ 2024-02-23T07:51:30Z

<?php

declare(strict_types=1);

final readonly class Version
{
    private string $version;

    private function __construct(
        string $version
    ){
        // TODO: ensure is valid
        $this->version = $version;
    }

    public static function fromString(string $string): self
    {
        return new self($string);
    }
}

final readonly class Example
{
    private ?Version $modifiedVersionForCloning = null;

    public function __construct(
        public Version $version
    ) {}

    public function __clone()
    {
        $this->version = $this->modifiedVersionForCloning;
        $this->modifiedVersionForCloning = null;
    }

    public function lol(string $version): self
    {
        $this->modifiedVersionForCloning = Version::fromString($version);
        $clone = clone $this;

        return $clone;
    }
}

$example = new Example(Version::fromString('8.2'));

var_dump($example->lol('8.3'));

Output for rfc.property-hooks, git.master, git.master_jit: Fatal error: Readonly property Example::$modifiedVersionForCloning cannot have default value in /in/DJhth on line 24
Process exited with code 255.

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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