(PHP 4, PHP 5)
imap_clearflag_full — Clears flags on messages
This function causes a store to delete the specified flag to the flags set for the messages in the specified sequence.
由 imap_open() 返回的 IMAP 流。
A sequence of message numbers. You can enumerate desired messages with the X,Y syntax, or retrieve all messages within an interval with the X:Y syntax
The flags which you can unset are "\Seen", "\Answered", "\Flagged", "\Deleted", and "\Draft" (as defined by » RFC2060)
options are a bit mask and may contain the single option:
成功时返回 TRUE， 或者在失败时返回 FALSE.