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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
 [2006-11-08 17:36 UTC] mp at webfactory dot de
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:

Actual result:

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


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 [2006-11-08 18:26 UTC]
Sara should have a patch as soon as she gets online
 [2006-12-12 23:26 UTC]
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
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]
The function needs to be passed an object not a name of an 
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