Description:
------------
1. The version number of the PHP package or files you are using.
Latest PHP 5.4 for Windows

2. A short script that reproduces the problem
<test script>

Sometimes, it produce this error on log file:
Warning: mb_convert_encoding(): Unable to detect character encoding in XXX.php 
on line XXX

It seems that 'auto' is not expanding to "ASCII,JIS,UTF-8,EUC-JP,SJIS".

This is a temporary fix for me:
[TYPE A]
$out_strs = mb_convert_encoding($out_strs, "UTF-8", "ASCII,JIS,UTF-8,EUC-
JP,SJIS");

or,
[TYPE B]
mb_language("Japanese");
$out_strs = mb_convert_encoding($out_strs, "UTF-8", "auto");


Test script:
---------------
I'm Englishman, so I'm added this in php.ini;
mbstring.language = English
mbstring.internal_encoding = UTF-8

And the source code is;
$out_strs = mb_convert_encoding($out_strs, "UTF-8", "auto");

Expected result:
----------------
auto SHOULD expand to ASCII,JIS,UTF-8,EUC-JP,SJIS.
Why should I change mbstring.language = English to Japs?