(PHP 4, PHP 5, PHP 7)
imap_undelete — Unmark the message which is marked deleted
imap_undelete ( resource $imap_stream , int $msg_number [, int $flags = 0 ] ) : bool
Removes the deletion flag for a specified message, which is set by imap_delete() or imap_mail_move().
imap_stream
An IMAP stream returned by imap_open().
msg_number
The message number
flags
Returns true on success or false on failure.
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https://www.php.net/manual/en/function.imap-undelete.php