(PHP 4, PHP 5, PHP 7, PHP 8)
imap_close — Close an IMAP stream
imapIMAP\Connection 实例。
flags
       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()
      
   总是返回 true。
  
   Throws a ValueError if flags
   is invalid.
  
| 版本 | 说明 | 
|---|---|
| 8.1.0 | 现在 imap参数接受 IMAP\Connection
  实例,之前接受有效的imapresource。 | 
| 8.0.0 | A ValueError is now thrown on invalid flagsparameter values. Previously,
       a warning was emitted and the function returnedfalse. | 
