[PHP-BUG] Bug #71183 [NEW]: mb_detect_encoding wrong with Windows-1252

From:             martin at sutunam dot com
Operating system: Ubuntu
PHP version:      5.5.30
Package:          mbstring related
Bug Type:         Bug
Bug description:mb_detect_encoding wrong with Windows-1252

Description:
------------
mb_detect_encoding doesn't detect string with Windows-1252 ( cp1252 )
encoding. 

The function is supposed to return the first compatible encoding within
the provided encoding list as second param.

Even with an ASCII string like 'aaa', it refuse the Windows-1252
encoding.

Test script:
---------------
<?php
$enc = 'Windows-1252';
if (!in_array($enc, mb_list_encodings())) {
    die($enc.' not supported');
}

$val = '100 '. 0x80; // € sign in cp1252
echo mb_detect_encoding($val, $enc.',ISO-8859-1', true).PHP_EOL;

$val = 'aaa';
echo mb_detect_encoding($val, $enc.',ISO-8859-1', true).PHP_EOL;

Expected result:
----------------
Windows-1252
Windows-1252

Actual result:
--------------
ISO-8859-1
ISO-8859-1

-- 
Edit bug report at https://bugs.php.net/bug.php?id=71183&edit=1
-- 
Try a snapshot (PHP 5.4):   https://bugs.php.net/fix.php?id=71183&r=trysnapshot54
Try a snapshot (PHP 5.5):   https://bugs.php.net/fix.php?id=71183&r=trysnapshot55
Try a snapshot (trunk):     https://bugs.php.net/fix.php?id=71183&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=71183&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=71183&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=71183&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=71183&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=71183&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=71183&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=71183&r=notwrong
Not enough info:            https://bugs.php.net/fix.php?id=71183&r=notenoughinfo
Submitted twice:            https://bugs.php.net/fix.php?id=71183&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=71183&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=71183&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=71183&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=71183&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=71183&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=71183&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=71183&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=71183&r=mysqlcfg