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Bug #57461 Error with escaped backslash
Submitted: 2006-12-28 07:36 UTC Modified: 2013-02-18 00:35 UTC
Avg. Score:4.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: alex at passant dot org Assigned:
Status: No Feedback Package: json (PECL)
PHP Version: 5.2.0 RC4 OS: Debian
Private report: No CVE-ID: None
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From: alex at passant dot org
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 [2006-12-28 07:36 UTC] alex at passant dot org
When a string contains \\, json_decode returns no result (while \/ works fine).

Reproduce code:
  "head": {
    "vars": ["site", "name"]
  "results": {
    "distinct": true,
    "bindings": [
        "site": { "type": "uri", "value": "" },
        "name": { "type": "literal", "value": "B:\\datenbrei" }

Expected result:
stdClass Object
    [head] => stdClass Object
            [vars] => Array
                    [0] => site
                    [1] => name


    [results] => stdClass Object
            [distinct] => 1
            [bindings] => Array
                    [0] => stdClass Object
                            [site] => stdClass Object
                                    [type] => uri
                                    [value] =>

                            [name] => stdClass Object
                                    [type] => literal
                                    [value] => B:\datenbrei





Actual result:


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 [2008-12-18 21:46 UTC]
I can't reproduce this with 5.2.6.

$a = array('name' => 'B:\datenbrei');

string(24) "{"name":"B:\\datenbrei"}"
object(stdClass)#1 (1) {
  string(12) "B:\datenbrei"
 [2012-08-02 11:44 UTC] lonny at lonnylot dot com
I can reproduce this on 5.4.5-dev - your test is wrong. You need to have two backslashes, not one
 [2012-08-30 15:04 UTC] lonnyk at gmail dot com
The issue stems from the fact that when you set a string in a PHP script and it 
contains \\. The \\ is _almost_ *always* interpreted by PHP and stored internally 
as a single \. Because a backslash always needs to be escaped in a json object 
decoding the string always fails.

Currently the only ways to set a string in your script is to either triple escape 
your backslash (\\\) or use a NOWDOC.

The only other option I can come up with is to allow json_decode to take invalid 
json strings (and valid json strings). Here is what that patch would look like:

I'm not sure if it would be better to accept invalid json strings or if it would 
be better to just make a note of this in the PHP documentation.
 [2013-02-18 00:35 UTC] pecl-dev at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Open". Thank you.
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