Edit report at http://bugs.php.net/bug.php?id=51225&edit=1
ID: 51225
User updated by: tony at marston-home dot demon dot co dot uk
Reported by: tony at marston-home dot demon dot co dot uk
Summary: cannot define a class with the same name as an
interface
Status: Re-Opened
Type: Bug
Package: Class/Object related
Operating System: Windows XP
PHP Version: 5.2.13
New Comment:
I disagree. class_exists() SHOULD check if that name has already been
declared as an interface otherwise you get the following situation:
if (!class_exists('foobar') { // returns false
class foobar{} // fails because interface exists
}
On the one hand it is saying "a class with the name 'foobar' does not
exist" which is immediately followed by "you cannot create a class with
the name 'foobar' as it already exists". That is not logical to me.
Previous Comments:
------------------------------------------------------------------------
[2010-03-08 00:55:52] [email protected]
I think the error message ("Cannot redeclare class") should be clearer
about classes and interfaces sharing the same namespace, which is needed
as type hints would be conflicting otherwise, but class_exists (by
default) should only check classes in my opinion. Any change should
consider that there's also interface_exists() and they should be
consistent.
------------------------------------------------------------------------
[2010-03-08 00:28:39] [email protected]
Yes, I agree.
------------------------------------------------------------------------
[2010-03-08 00:23:50] tony at marston-home dot demon dot co dot uk
If an interface is a class, then it should show up in class_exists() and
get_declared_classes().
------------------------------------------------------------------------
[2010-03-08 00:02:25] [email protected]
Thats how the OO is designed, internally is interfaces just a class with
an additional flag.
So no bug here
------------------------------------------------------------------------
[2010-03-06 18:50:41] tony at marston-home dot demon dot co dot uk
Description:
------------
When I try to define a particular class it fails with "cannot redeclare
class ...". When I check with class_exists('...') it returns false, but
I still cannot create it. I eventually found some previous code which
uses the same name to define an interface.
Test script:
---------------
Interface Singleton{public static function instance();}
if (class_exists('Singleton')) {
$reason = 'class already exists';
} else {
class Singleton{
static function getInstance(){
return true;
}
}
}
Expected result:
----------------
If it is not possible to define a class and an interface with the same
name, then the class_exists() function should also include interface
names.
If it IS possible to have a class and an interface with the same name,
then the compiler should NOT reject the second reference.
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/bug.php?id=51225&edit=1
