(PHP 4, PHP 5, PHP 7, PHP 8)
imap_utf7_decode — Decodes a modified UTF-7 encoded string
$string): string|false
   Decodes modified UTF-7 string into ISO-8859-1 string.
  
This function is needed to decode mailbox names that contain certain characters which are not in range of printable ASCII characters.
   Returns a string that is encoded in ISO-8859-1 and consists of the same
   sequence of characters in string, or false
   if string contains invalid modified UTF-7 sequence
   or string contains a character that is not part of
   ISO-8859-1 character set.