(PHP 4, PHP 5, PHP 7, PHP 8)
imap_undelete — Unmark the message which is marked deleted
Removes the deletion flag for a specified message, which is set by imap_delete() or imap_mail_move().
imapAn IMAP\Connection instance.
message_nums
       A string representing one or more messages in IMAP4-style sequence format
       ("n", "n:m", or combination of these
       delimited by commas).
      
flags
   Returns true on success or false on failure.
  
| Version | Description | 
|---|---|
| 8.1.0 | The imapparameter expects an IMAP\Connection
  instance now; previously, a resource was expected. |