imap_mail_move, imap_mail_copy not working

I am using PHP's IMAP function to redirect mail. I am using the function given in the documentation imap_mail_move, imap_mail_copy. but this is not working, it returns false. the that i am using,

$mbox = '{'.$server.':'.$port.'/'.$tls.'}'.$mailbox;
$stream = imap_open($mbox,$username,$password);

$forward_mail_id = "mymail@gmail.com";
$msglist = "1,2,3";

$copy_status = imap_mail_move($stream , $msglist, $forward_mail_id);

but function returns false. I want the mail in my webservers INBOX to be forwarded to my gma开发者_开发问答il's ID.

1. If you are using TLS sessions, make sure that the connection is successful.

2. Try

   $copy_status = imap_mail_move($stream , $msglist, $forward_mail_id, CP_UID);
   

   $msglist then should consist of UIDs, not sequence numbers, of course.