cvsup tags for older version of a port

[fbsd_user]

I was using php4-4.3.6_1  and every thing worked. Yesterday I
updated to php4-4.3.6_1  and now having problems. I want to return
to older version  php4-4.3.6_1

I tried this tag RELENG_4_9 but no go.

Is there a way to get older version of a port?