Description:
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---
From manual page: http://www.php.net/function.mb-encode-mimeheader
---

> charset specifies the name of the character set in which str is represented in.

I assume "input parameter $str is encoded with $charset" from this sentence, but $charset specifies the character set which is used for the output encoding (i.e. the name will be shown in between "=?" and "?B?" of the MIME header), the input encoding is mb_internal_encoding().

At least, Japanese translation can be read "$charset is the character set name of $str". I think it's wrong.


> mb_internal_encoding() should be set to same encoding.

$str should be represented in same encoding as mb_internal_encoding().

$charset is not related to mb_internal_encoding(), so this sentence should be in the description of $str.

Test script:
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mb_internal_encoding('UTF-8');
mb_language('ja');
$str = "\xe3\x81\x82"; // Japanese string

echo mb_encode_mimeheader($str, 'ISO-2022-JP'); 
// =?ISO-2022-JP?B?GyRCJCIbKEI=?=
echo mb_encode_mimeheader($str, 'UTF-8');
// =?UTF-8?B?44GC?=