(PHP 4, PHP 5, PHP 7)
imap_utf7_encode — Converts ISO-8859-1 string to modified UTF-7 text
imap_utf7_encode ( string $data ) : string
Converts data to modified UTF-7 text.
This is needed to encode mailbox names that contain certain characters which are not in range of printable ASCII characters.
data
An ISO-8859-1 string.
Returns data encoded with the modified UTF-7 encoding as defined in » RFC 2060, section 5.1.3 (original UTF-7 was defined in » RFC1642).
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https://www.php.net/manual/en/function.imap-utf7-encode.php