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@ 2017-04-26T02:26:40Z

<?php

declare(strict_types=1);

final class Immutable {
    private $data;
    private $mutable = true;
    
    public function __construct(array $args) {
        if (false === $this->mutable) {
            throw new \BadMethodCallException('Constructor called twice.');
        }
        $this->data = $this->sanitiseInput($args);
        $this->mutable = false;
    }
    public function getData(): array {
        return $this->data;
    }
    public function sanitiseInput(array $args): array {
        return array_map(function($x) {
            if (is_scalar($x)) return $x;
            else if (is_object($x)) return $this->sanitiseObject($x);
            else if (is_array($x)) return $this->sanitiseInput($x);
            else throw new \InvalidArgumentException('Resources cannot be made immutable.');
        }, $args);
    }
    private static function sanitiseObject(Immutable $object): Immutable {
        return clone $object;
    }
    public function __clone() {
        $this->data = $this->sanitiseInput($this->data);
    }
    public function __unset(string $id): void {}
    public function __set(string $id, $val): void {}
}

$a = new Immutable([new stdClass, 10, 'yayaya']);
$b = new Immutable([1]);

var_dump($a);
var_dump($b);

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught TypeError: Immutable::sanitiseObject(): Argument #1 ($object) must be of type Immutable, stdClass given, called in /in/p3o3m on line 22 and defined in /in/p3o3m:27 Stack trace: #0 /in/p3o3m(22): Immutable::sanitiseObject(Object(stdClass)) #1 [internal function]: Immutable->{closure}(Object(stdClass)) #2 /in/p3o3m(20): array_map(Object(Closure), Array) #3 /in/p3o3m(13): Immutable->sanitiseInput(Array) #4 /in/p3o3m(37): Immutable->__construct(Array) #5 {main} thrown in /in/p3o3m on line 27
Process exited with code 255.

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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