(PHP 3, PHP 4, PHP 5)
Closes the imap stream.
imap_stream
An IMAP stream returned by imap_open().
flag
If set to CL_EXPUNGE, the function will silently expunge the mailbox before closing, removing all messages marked for deletion. You can achieve the same thing by using imap_expunge()
如果成功则返回 TRUE,失败则返回 FALSE。