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Bug #29015 Incorrect behavior of member vars(non string ones)-numeric mem vars und others
Submitted: 2004-07-05 15:02 UTC Modified: 2005-04-28 19:41 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:0 (0.0%)
From: tomas_matousek at hotmail dot com Assigned:
Status: Closed Package: Scripting Engine problem
PHP Version: 5CVS-2005-03-06 OS: *
Private report: No CVE-ID:
 [2004-07-05 15:02 UTC] tomas_matousek at hotmail dot com
Description:
------------
If I try to use variable with non-string name (e.g. 
$x = 10; $$x = ...) the name is converted to a string using standard conversion rules. That's ok.
But this doesn't work on object's field which is IMHO a bug and it implies some a buggy behavior.
See the code bellow.

It seems that by:
$x = null;
$a->$x = "whatever";
one can somehow create a private variable (or something like that, don't know what ":private" means)!

Moreover, there is possibly a bug in get_object_vars when a field name is a numeric string (e.g. "10") (compare the first item of results of get_object_vars and var_dump).

Reproduce code:
---------------
function field_names_test()
{  
  $a = new stdClass();
  
  $x = 10;
  $a->$x = "int(10)";
  
  $x = "10";
  $a->$x = "string('10')";
  
  $x = "";
  $a->$x = "string('')";
  
  $x = null;
  $a->$x = "null";
  
  $x = 1.8;
  $a->$x = "double(1.8)";
  
  $x = false;
  $a->$x = "bool(false)";
  
  $x = array(1,2,3);
  $a->$x = "array(1,2,3)";
  
  var_dump(get_object_vars($a));
  var_dump($a);
}
field_names_test();

Expected result:
----------------
array(4) {
  ["10"]=>
  string(12) "string('10')"
  [""]=>
  string(11) "bool(false)"
  ["1.8"]=>
  string(11) "double(1.8)"
  ["Array"]=>
  string(12) "array(1,2,3)"
}
object(stdClass)#1 (4) {
  ["10"]=>
  string(12) "string('10')"
  [""]=>
  string(11) "bool(false)"
  ["1.8"]=>
  string(11) "double(1.8)"
  ["Array"]=>
  string(12) "array(1,2,3)"
}


Actual result:
--------------
array(3) {
  [10]=>
  string(12) "string('10')"
  ["1.8"]=>
  string(11) "double(1.8)"
  ["Array"]=>
  string(12) "array(1,2,3)"
}
object(stdClass)#1 (4) {
  ["10"]=>
  string(12) "string('10')"
  [":private"]=>
  string(11) "bool(false)"
  ["1.8"]=>
  string(11) "double(1.8)"
  ["Array"]=>
  string(12) "array(1,2,3)"
}


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 [2004-08-14 00:43 UTC] php at hristov dot com
AFAUK, internally the private member variables are stored in such a way that the first byte is \0, which maybe you emulate with your test case. ":private" means that the member var is private one.

shorter example for "creating" of a private variable :
php -r '$a=new stdclass();$a->$b=3;var_dump($a);'
and of "integer" member variable
php -r '$a=new stdclass();$b=3;$a->$b=3;var_dump($a);' 

andrey
 [2005-04-28 19:41 UTC] dmitry@php.net
Fixed in CVS HEAD and PHP_5_0.

Empty property and string properties started with '\0' are disallowed.
 
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