Online PHP editor | rfc for IDhRY

@ 2022-11-17T14:44:01Z

<?php

/* readonly */ class ImmutableCounter {
    public function __construct(private readonly int $count) {}

    public function add1(): self { return new self($this->count + 1); }

    public function value(): int { return $this->count; }
}

// assuming the proposed RFC is in place, this is now possible:
class MutableCounter extends ImmutableCounter {
    public function __construct(private int $count) {}

    public function add1(): self { return new self(++$this->count); }

    public function value(): int { return $this->count; }
}

$counter1 = new ImmutableCounter(0);
$counter2 = $counter1->add1();
$counter3 = $counter2->add1();

var_dump([$counter1->value(), $counter2->value(), $counter3->value()]);

$mutableCounter1 = new MutableCounter(0);
$mutableCounter2 = $mutableCounter1->add1();
$mutableCounter3 = $mutableCounter2->add1();

var_dump([$mutableCounter1->value(), $mutableCounter2->value(), $mutableCounter3->value()]);

Output for git.master, git.master_jit: array(3) { [0]=> int(0) [1]=> int(1) [2]=> int(2) } array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(2) }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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