Carbon Notice Error: serialize(): __sleep should return an array only containing the names of instance-variables to serialize

[dercoder]

Hi,

I get this notice message when I try to use a Carbon DateTime in a closure. It is working! Its just an Notice Error. So its not really important.

I tested it on: Linux PHP 7.3 Windows PHP 7.2

To test it: https://github.com/dercoder/closure-carbon-issue

php test_carbon.php

PHP Notice:  serialize(): __sleep should return an array only containing the names of instance-variables to serialize. in closure-carbon-issue\vendor\opis\closure\src\SerializableClosure.php on line 155
PHP Stack trace:
PHP   1. {main}() closure-carbon-issue\test_carbon.php:0
PHP   2. serialize() closure-carbon-issue\test_carbon.php:20
PHP   3. Opis\Closure\SerializableClosure->serialize() closure-carbon-issue\test_carbon.php:20
PHP   4. serialize() closure-carbon-issue\vendor\opis\closure\src\SerializableClosure.php:155

[GrahamCampbell]

Do you see this issue on PHP 7.4 too?

[dercoder]

Yes, i get more errors here:

PHP Notice:  serialize(): "date" returned as member variable from __sleep() but does not exist in /mnt/c/Users/PhpstormProjects/closure-carbon-issue/vendor/opis/closure/src/SerializableClosure.php on line 155
PHP Notice:  serialize(): "timezone_type" returned as member variable from __sleep() but does not exist in /mnt/c/Users/PhpstormProjects/closure-carbon-issue/vendor/opis/closure/src/SerializableClosure.php on line 155
PHP Notice:  serialize(): "timezone" returned as member variable from __sleep() but does not exist in /mnt/c/Users/PhpstormProjects/closure-carbon-issue/vendor/opis/closure/src/SerializableClosure.php on line 155
PHP Fatal error:  Uncaught Error: Invalid serialization data for DateTime object in /mnt/c/Users/PhpstormProjects/closure-carbon-issue/vendor/nesbot/carbon/src/Carbon/Traits/Serialization.php:131
Stack trace:
#0 /mnt/c/Users/PhpstormProjects/closure-carbon-issue/vendor/nesbot/carbon/src/Carbon/Traits/Serialization.php(131): DateTime->__wakeup()
#1 [internal function]: Carbon\Carbon->__wakeup()
#2 /mnt/c/Users/PhpstormProjects/closure-carbon-issue/test_carbon.php(21): unserialize()
#3 {main}
  thrown in /mnt/c/Users/PhpstormProjects/closure-carbon-issue/vendor/nesbot/carbon/src/Carbon/Traits/Serialization.php on line 131

PHP 7.4.6 (cli) (built: May 14 2020 10:03:35) ( NTS ) Copyright (c) The PHP Group Zend Engine v3.4.0, Copyright (c) Zend Technologies with Zend OPcache v7.4.6, Copyright (c), by Zend Technologies

[sorinsarca]

Since test_datetime.php works, I suspect that the problem is in carbon library.

[dercoder]

The regular serialize() code is working with Carbon: https://github.com/dercoder/closure-carbon-issue/blob/master/test_carbon.php#L12

[sorinsarca]

I'm afraid that the problem is in PHP itself. The DateTime class is broken, and starting with PHP 7.4 some properties are not shown by the reflection. See https://3v4l.org/joLur

<?php

$date = new DateTime();
$reflection = new ReflectionObject($date);
$props = [];

foreach ($reflection->getProperties() as $p) {
    $props[] = $p->getName();
}

var_dump($props);

So we never set the date, timezone and timezone_type properties because we cannot see them using reflection, resulting your error:

PHP Notice:  serialize(): "date" returned as member variable from __sleep() but does not exist in /mnt/c/Users/PhpstormProjects/closure-carbon-issue/vendor/opis/closure/src/SerializableClosure.php on line 155
PHP Notice:  serialize(): "timezone_type" returned as member variable from __sleep() but does not exist in /mnt/c/Users/PhpstormProjects/closure-carbon-issue/vendor/opis/closure/src/SerializableClosure.php on line 155
PHP Notice:  serialize(): "timezone" returned as member variable from __sleep() but does not exist in /mnt/c/Users/PhpstormProjects/closure-carbon-issue/vendor/opis/closure/src/SerializableClosure.php on line 155
PHP Fatal error:  Uncaught Error: Invalid serialization data for DateTime object in /mnt/c/Users/PhpstormProjects/closure-carbon-issue/vendor/nesbot/carbon/src/Carbon/Traits/Serialization.php:131

[dercoder]

I understand. The utput of PHP 8 is the same like PHP 7.4

When you serialize it, the properties are in the string:

var_dump(serialize(new DateTime()));

# string(128) "O:8:"DateTime":3:{s:4:"date";s:26:"2020-08-26 01:11:27.025541";s:13:"timezone_type";i:3;s:8:"timezone";s:16:"Europe/Amsterdam";}"

Do you got any ideas? Workaround?

[dercoder]

I found also this: https://bugs.php.net/bug.php?id=79041

[didix16]

Hi there, is any workarround about this? I'm trying to store data inside a cache to improve laravel page speed but I cannot due serialize(): "date" returned as member variable from __sleep() but does not exist problem.

Thanks in advance