imap_msgno
(PHP 4, PHP 5, PHP 7)
imap_msgno — Gets the message sequence number for the given UID
说明
   imap_msgno
    ( resource 
  $imap_stream
   , int $uid
   ) : int
   Returns the message sequence number for the given 
   uid.
  
This function is the inverse of imap_uid().
返回值
   Returns the message sequence number for the given 
   uid.