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Request #28016 is_resource() returns false for resources of type "Unknown"
Submitted: 2004-04-15 21:15 UTC Modified: 2016-09-29 11:50 UTC
Votes:11
Avg. Score:4.3 ± 0.7
Reproduced:9 of 9 (100.0%)
Same Version:4 (44.4%)
Same OS:4 (44.4%)
From: php at ter dot dk Assigned: cmb (profile)
Status: Closed Package: *General Issues
PHP Version: * OS: *
Private report: No CVE-ID: None
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 [2004-04-15 21:15 UTC] php at ter dot dk 
Description:
------------
(version of PHP is 4.3.6, not 4.3.6RC3, but I wasn't able to select that)

If a resource for some reason is of type "Unknown", is_resource() returns false. Though, gettype() still returns "resource" as type, as always.

This behaviour in is_resource() has changed between 4.3.5 and 4.3.6.

I'm guessing here, but the new behaviour could be related to changes introduced to fix bug 27822 (which was fixed in between 4.3.5 and 4.3.6).

In my example I'm using php-imlib to gain an object of type "Unknown". Even though it isn't an official extension, there still is some inconsistency between gettype() returning "resource" and is_resource() returning false. In other words, it's the inconsistency between is_resource() and gettype() I see as the bug.

Example is also available at: http://stock.ter.dk/resource_error.php

Reproduce code:
---------------
$i = imlib_create_image(100,200);
var_dump($i);
var_dump(gettype($i));
var_dump(is_resource($i));


Expected result:
----------------
resource(2) of type (Unknown)
string(8) "resource"
bool(true)


Actual result:
--------------
resource(2) of type (Unknown)
string(8) "resource"
bool(false)

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 [2004-04-15 22:35 UTC] sniper@php.net 
Derick, IMO, the fix for bug #27822 was incorrect. 
Resource is still a resource even if it's closed..
Or you need to unset the variable with any 'close'.. :)
 [2004-04-16 03:15 UTC] derick@php.net 
No, the fix was correct. Close() in this case destroyed the resource data in the variable, so it's no longer a resource anymore. I think the correct thing to do here is to make gettype() not show "resource" either.
 [2004-04-16 08:37 UTC] php at ter dot dk 
But will it solve the problem in my situation? After all, I do have a resource by hand, and would be pretty sad if other functions wouldn't recognize it as a resource.

I do agree though that making gettype not return "resource" for a closed resource (since is_resource() already does that). I just don't like the idea that these functions might not recognize my resource at all.

- Peter Brodersen
 [2004-04-16 11:05 UTC] derick@php.net 
If the imlib extension gives it a proper name then it should work fine, so I think it's also a bug there.
 [2004-04-16 15:11 UTC] sniper@php.net 
Derick: I agree, just change gettype() too.

And imlib / other extensions using the wrong way in registering resources should be fixed. The 'non-named' resource is meant for something else..
 [2004-07-19 19:16 UTC] php at afdelingp dot dk 
I have created a patch for Piotr Pawlow's version of php_imlib 0.3, fixing this issue for imlib (though I think the PHP behavior is strange at best).

http://www.afdelingp.dk/files/php-4.3.8-imlib-rsrc.diff

Best regards,
Morten K. Poulsen
 [2010-12-20 14:00 UTC] jani@php.net
-Package: Feature/Change Request +Package: *General Issues -PHP Version: 5CVS, 6CVS (2008-10-28) +PHP Version: *
 [2013-01-06 16:05 UTC] derick@php.net
-Status: Assigned +Status: Open -Assigned To: derick +Assigned To:
 [2014-08-22 12:09 UTC] justinasu at gmail dot com 
this is still reproducible in PHP 5.4.30, how is this not fixed yet?
 [2016-09-29 11:50 UTC] cmb@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: cmb
 [2016-09-29 11:50 UTC] cmb@php.net 
> In other words, it's the inconsistency between is_resource() and
> gettype() I see as the bug.

And this inconsistency has been resolved long ago, see
<https://3v4l.org/qnk41>, so this ticket can be closed.
 
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