imap_msgno(PHP 4, PHP 5) imap_msgno — Gets the message sequence number for the given UID Описание
   int imap_msgno
    ( resource $imap_stream
   , int $uid
   ) 
  Returns the message sequence number for the given uid. This function is the inverse of imap_uid(). Возвращаемые значенияReturns the message sequence number for the given uid.  | 
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