Edit report at https://bugs.php.net/bug.php?id=61660&edit=1
ID: 61660
Updated by: laruence@php.net
Reported by: krtek4+php at gmail dot com
Summary: bin2hex(hex2bin($data)) != $data
Status: Open
Type: Bug
Package: Unknown/Other Function
Operating System: Debian Linux
PHP Version: 5.4.1RC1
Block user comment: N
Private report: N
New Comment:
I think it's better to well document this. or, add a prepend '0' , I will make a
patch for this.
Previous Comments:
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[2012-04-07 16:45:45] krtek4+php at gmail dot com
I'm aware that this is a problem with the internal reprensation of the binary
value which has to be aligned on 8 bits.
But with the actual implementation, we are losing informations.
A possible solution would be to pad the binary data with 0 on the left and when
converting back again to hex, remove the leading 0s.
At least, something should be said in the documentation about this shortcoming.
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[2012-04-07 15:46:35] krtek4+php at gmail dot com
Description:
------------
If you try to apply bin2hex on the result of hex2bin, when the length of the
initial data is an odd number, the resulting data are not the same as the
original.
$ php -v
PHP 5.4.1RC1 (cli) (built: Apr 6 2012 13:31:16)
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies
This is the original Debian package present in sid on the 7th April 2012
Test script:
---------------
<?php
$data = '12345';
var_dump($data, bin2hex(hex2bin($data)));
// outputs :
// string(5) "12345"
// string(4) "1234"
Expected result:
----------------
The output should be the same. (ie 12345 both times)
Actual result:
--------------
string(5) "12345"
string(4) "1234"
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Edit this bug report at https://bugs.php.net/bug.php?id=61660&edit=1