(PHP 3, PHP 4, PHP 5)
This function removes the deletion flag for a specified message, which is set by imap_delete() or imap_mail_move().
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.
See also: imap_delete(), and imap_mail_move().
In PHP 3.0.15, this function suffers from the same 3-arguments-only problem that imap_delete() has. I've found that adding "NIL" as the third parameter works just fine.