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To: "PHP internals" <internals@lists.php.net>, "Rasmus Schultz"
 <rasmus@mindplay.dk>
References: <CADqTB_gy-P21DP-HepzgO-W6QT5SpFZFvyYBDWEicOvoUJ9pCA@mail.gmail.com>
Date: Sat, 04 Jun 2016 22:45:59 +0300
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Message-ID: <op.yijs6x1yc9evq2@nikita-pc>
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Subject: Re: [PHP-DEV] can't reflection on DateTime properties?
From: inefedor@gmail.com ("Nikita Nefedov")

On Sat, 04 Jun 2016 22:36:19 +0300, Rasmus Schultz <rasmus@mindplay.dk>  
wrote:

> I wrote a library that can serialize/unserialize PHP object graphs to  
> JSON
> data.
>
> Somebody reported it doesn't work on the DateTime class.
>
> Does this deliberately not work?
>
>     $date = new DateTime();
>
>     var_dump($date);
>
> outputs:
>
>     object(DateTime)#1 (3) {
>       ["date"]=>
>       string(19) "2016-06-04 19:30:19"
>       ["timezone_type"]=>
>       int(3)
>       ["timezone"]=>
>       string(3) "UTC"
>     }
>
> however, this...
>
>     $reflection = new ReflectionClass('DateTime');
>
>     var_dump($reflection->getProperties());
>
> outputs:
>
>     array(0) {
>     }
>
> The object clearly has properties corresponding to it's internal state,  
> but
> reflection doesn't seem to report them?
>
> Also, what comes out of var_dump() appears to be something intended for
> human consumption? I'm guessing that's not the actual internal state of  
> the
> object - most likely the internal state consists of the "timezone_type"  
> and
> an integer timestamp?

Yes, DateTime/DateTimeImmutable classes define custom `get_properties`  
zend_class_entry handler:  
http://lxr.php.net/xref/PHP_MASTER/ext/date/php_date.c#2162
Which is called whenever you `var_dump()` it or foreach over the object or  
call a `get_object_vars()` on it: https://3v4l.org/tNJXN

But reflection on the other hand directly uses  
`zend_class_entry->properties_info` table which DateTime does not have:  
http://lxr.php.net/xref/PHP_MASTER/ext/reflection/php_reflection.c#4574