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Bug #25124 overload() messes with array member variables
Submitted: 2003-08-18 02:34 UTC Modified: 2004-02-24 10:05 UTC
Votes:7
Avg. Score:4.7 ± 0.7
Reproduced:5 of 5 (100.0%)
Same Version:3 (60.0%)
Same OS:2 (40.0%)
From: ian at ardes dot com Assigned:
Status: Not a bug Package: Class/Object related
PHP Version: 4CVS-2004-02-11 OS: *
Private report: No CVE-ID: None
 [2003-08-18 02:34 UTC] ian at ardes dot com
Description:
------------
Summary: When a class is overloaded with overload(), 
array member variables go wrong.

If you overload a class, then access to declared array 
member variables from within member functions (and 
anywhere else I think) stops working correctly.

The very simple class in the code should not change 
it's behaviour at all once it is overloaded.  But it 
does.

Reproduce code:
---------------
class Overloaded {
    var $_my_array = array();
    
    function Overloaded() {
        $this->_my_array[1] = '1st element';
    }
    
    function __get($nm, &$val) {
        return false;
    }
    
    function __set($nm, $val) {
        return false;
    }
}

$o1 = new Overloaded();
print ("before overload(): "); print_r($o1);

overload('Overloaded');

$o2 = new Overloaded();
print ("after overload():  "); print_r($o2);

Expected result:
----------------
before overload(): overloaded Object
(
    [_my_array] => Array
        (
            [1] => 1st element
        )

)
after overload(): overloaded Object
(
    [_my_array] => Array
        (
            [1] => 1st element
        )

)

Actual result:
--------------
before overload(): overloaded Object
(
    [_my_array] => Array
        (
            [1] => 1st element
        )

)
after overload():  overloaded Object
(
    [_my_array] => 1st element
)

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 [2004-02-17 15:52 UTC] andrei@php.net
Overloading of array indexes is not supported. This is expected behavior.
 [2004-02-17 16:37 UTC] sniper@php.net
Expected behaviour -> bogus.

 [2004-02-24 10:05 UTC] ian at ardes dot com
I thought that the overload functiality only applied to 
attributes that were not defined: defined attributes are 
passed over by the magic functions.

The example given is of a *defined* attribute being 
messed up, not an example of attempting to overload with 
array indexes.

If this is expected behavior, then I guess the 
disclaimer should read something like 'You cannot use 
array attributes on a class which is overloaded' rather 
than 'Overloading of array indexes is not supported'.

Thanks.
 
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