mb_internal_encoding
Can return 'neutral', which apparently means UTF-8.
mb_language
(PHP 4 >= 4.0.6, PHP 5)
mb_language — Set/Get current language
Parameters
-
language -
Used for encoding e-mail messages. Valid languages are "Japanese", "ja","English","en" and "uni" (UTF-8). mb_send_mail() uses this setting to encode e-mail.
Language and its setting is ISO-2022-JP/Base64 for Japanese, UTF-8/Base64 for uni, ISO-8859-1/quoted printable for English.
Return Values
If language is set and
language is valid, it returns
TRUE. Otherwise, it returns FALSE.
When language is omitted, it returns the language
name as a string. If no language is set previously, it then returns
FALSE.
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User Contributed Notes
mb_language - [2 notes]
Sohel Taslim ¶
5 years ago
It can help you to send an email as with Japanese contain.
<?php
mb_language("ja");
$subject = mb_convert_encoding($subject, "ISO-2022-JP","AUTO");
$subject = mb_encode_mimeheader($subject);
$result = mail($to, $subject, $body, $headers, $sendmail_params);
?>