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Bug #70733 int/string conversion bug in arrays
Submitted: 2015-10-17 15:43 UTC Modified: 2015-12-23 23:18 UTC
Votes:1
Avg. Score:3.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:0 (0.0%)
From: bfanger at gmail dot com Assigned:
Status: Duplicate Package: Scripting Engine problem
PHP Version: irrelevant OS: El Capitan
Private report: No CVE-ID: None
 [2015-10-17 15:43 UTC] bfanger at gmail dot com
Description:
------------
Reading and writing to an array could lead to new array entries (with an integer key) instead of overwriting the value.

This even leads weird json output using which uses same key twice, but that's an other issue.

Test script:
---------------
$object = json_decode('{"200": true}');
$data = get_object_vars($object);
$data['200'] = false;
echo json_encode($data, JSON_PRETTY_PRINT);


Expected result:
----------------
{
    "200": false
}

Actual result:
--------------
{
    "200": true,
    "200": false
}

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 [2015-10-17 16:27 UTC] ab@php.net
-PHP Version: 7.0.0RC5 +PHP Version: irrelevant
 [2015-10-17 16:27 UTC] ab@php.net
Reproduced even with 5.5.

Thanks.
 [2015-10-18 07:19 UTC] laruence@php.net
actually, this is not something new...

because, there are string "200" and interge 200 in the same array.

which is an knew issue.
 [2015-10-18 09:29 UTC] bfanger at gmail dot com
@laruence But the code snippet doesn't use integers anywhere, but php7 somehow decides to use the integer 200 instead of the given '200'.

PHP 5.3, 5.3, 5.4, 5.5, 5.6 doesn't have this issue.
 [2015-10-18 11:35 UTC] laruence@php.net
that is get_object_vars now reuse the same array of the properties table of stdclass..

like: 
<?php
$object = json_decode('{"200": true}');
$data = (array)($object);
var_dump($data);
$data['200'] = false;
var_dump($data);
echo json_encode($data, JSON_PRETTY_PRINT);


this will result the same result both on php-5.6 and php7

:<
 [2015-11-28 11:23 UTC] bfanger at gmail dot com
So the bug is even older, when you use `(array)` instead of `get_object_vars()` :-(
Sound like an opportunity to fix it in PHP7 which suppose to have better types. ;-)

I've found some workarounds make the following code work reliably across php versions:


$data["200"] = false;


Workaround 1: 
  $data = unserialize(serialize((array) $object));

Workaround 2: 
  $data = unserialize(serialize(get_object_vars($object)));

Workaround 3:
  $data = json_decode(json_encode($object), true);
 [2015-12-23 23:18 UTC] ajf@php.net
-Status: Open +Status: Duplicate
 [2015-12-23 23:18 UTC] ajf@php.net
Duplicate of bug #66173
 
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