Online PHP editor | rfc for OVvKR

@ 2026-07-14T14:51:06Z

<?php

// Weakmaps accepts objects and arrays as keys
$source = new Weakmap();
$key = (object) ['a' => 2];
$source[$key] = 1;

// Yield may emit objects and arrays as keys
$source = function () {
    yield (object) ['a' => 3] => 1;
};
// This is just for illustration
$source = $source();

// An iterator may return objects and arrays as keys(mixed, in fact)
class myIterator implements Iterator {
    private int $position = 0;

    public function rewind(): void { $this->position = 0; }
    public function current(): mixed { return 1; }
    public function key(): mixed {
        return (object) ['a' => 4];
    }
    public function next(): void { ++$this->position; }
    public function valid(): bool { return $this->position == 0; }
}
$source = new myIterator();

foreach($source as $key => $value) {
    print get_class($key); // Stdclass
    print $value;        // 1
}

Output for git.master, git.master_jit: stdClass1

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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