(PHP 5 >= 5.3.0, PHP 7, PHP 8)
imap_utf8_to_mutf7 — Encode a UTF-8 string to modified UTF-7
Encode a UTF-8 string to modified UTF-7 (as specified in RFC 2060, section 5.1.3).
注意:
This function is only available, if libcclient exports utf8_to_mutf7().
stringA UTF-8 encoded string.
Returns string converted to modified UTF-7,
或者在失败时返回 false.