3v4l.org

run code in 500+ PHP versions simultaneously

@ 2026-01-25T11:56:28Z

<?php


declare(strict_types=1);

#[Attribute(Attribute::TARGET_PROPERTY)]
class TestAttribute
{
    public function __construct(
        public $callback
    ) {}
}


final class Clock
{
    public function format(string $format): string
    {
        return $format;
    }
}

final class Example
{
    // This version FAILS (Fatal error: Constant expression contains invalid operations)
    //#[TestAttribute(static fn (Clock $clock) => $clock->format('Y-m-d H:i:s'))]

    // This version PASSES
    #[TestAttribute(static function (Clock $clock) {
        return $clock->format('Y-m-d H:i:s');
    })]
    public ?Clock $created_at = null;
}

$ref = new ReflectionProperty(Example::class, 'created_at');
$attr = $ref->getAttributes(TestAttribute::class)[0]->newInstance();

var_dump($attr->callback instanceof Closure);

Output for git.master_jit: bool(true)
Output for git.master: Process exited with code 139.

This tab shows result from various feature-branches currently under review by the php developers. Contact me to have additional branches featured.

Active branches

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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

preferences:dark modelive previewkey bindings

47.99 ms | 492 KiB | 3 Q