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Bug #39435 wrong instanceof results
Submitted: 2006-11-08 17:36 UTC Modified: 2006-12-13 15:22 UTC
From: mp at webfactory dot de Assigned: pollita (profile)
Status: Closed Package: Class/Object related
PHP Version: 5.2.0 OS: any
Private report: No CVE-ID: None
View Developer Edit
 [2006-11-08 17:36 UTC] mp at webfactory dot de 
Description:
------------
instanceof produces wrong results when the first operand is not an object instance but a class name or a string containing a class name.


Reproduce code:
---------------
var_dump(Iterator instanceof Traversable);
var_dump("Iterator" instanceof Traversable); 

Expected result:
----------------
bool(true)
bool(true)

Actual result:
--------------
bool(false)

Fatal error: Invalid opcode 138/1/1. in ...

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 [2006-11-08 18:26 UTC] johannes@php.net 
Sara should have a patch as soon as she gets online
 [2006-12-12 23:26 UTC] pollita@php.net 
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.

This has been changed to throw a proper error message rather than the uninformative one given.  Perhaps in future versions this can be changed to allow constant strings giving the expected output, but not currently.
 [2006-12-13 08:40 UTC] mp at webfactory dot de 
Checked PHP 5.2.1-dev (cli) (built: Dec 13 2006 08:24:06).

var_dump(Iterator instanceof Traversable) now returns false, also with non-builtin (userland) classes, but should be true.

var_dump("Iterator" instanceof Traversable) now gives an fatal error "instanceof expects an object instance, constant given". It should accept the first operand as a string just like is_subclass_of does and check if the class named "Iterator" subclasses/implements the other operand.

$x = "Iterator";
var_dump($x instanceof Traversable) returns false. If $x is not an object but a string it might want to behave like the former case (string constant)?
 [2006-12-13 15:22 UTC] iliaa@php.net 
The function needs to be passed an object not a name of an 
object.
 
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