(PHP 3>= 3.0.15, PHP 4 , PHP 5)imap_utf7_encode -- Converts ISO-8859-1 string to modified UTF-7 text.
Converts data to modified UTF-7 text. Note that data is expected to be encoded in ISO-8859-1.
This is needed to encode mailbox names that contain certain characters which are not in range of printable ASCII characters.
See also: imap_utf7_decode().