(PHP 4, PHP 5, PHP 7, PHP 8)
imap_headerinfo — Read the header of the message
$imap,$message_num,$from_length = 0,$subject_length = 0Gets information about the given message number by reading its headers.
imapAn IMAP\Connection instance.
message_numThe message number
from_length
       Number of characters for the fetchfrom property.
       Must be greater than or equal to zero.
      
subject_length
       Number of characters for the fetchsubject property
       Must be greater than or equal to zero.
      
defaulthost
   Returns false on error or, if successful, the information in an object with following properties:
   
personal, adl,
      mailbox, and host
     
    personal, adl,
      mailbox, and host
     
    personal, adl,
      mailbox, and host
     
    personal, adl,
      mailbox, and host
     
    personal, adl,
      mailbox, and host
     
    personal, adl,
      mailbox, and host
     
    personal, 
      adl, mailbox, and 
      host
     
    R if recent and seen, N
      if recent and not seen, ' ' if not recent.
     
    U if not seen AND not recent, ' ' if seen
      OR not seen and recent
     
    F if flagged, ' ' if not flagged
     
    A if answered, ' ' if unanswered
     
    D if deleted, ' ' if not deleted
     
    X if draft, ' ' if not draft
     
    from_length
      characters
     
    subject_length characters
     
    | Version | Description | 
|---|---|
| 8.1.0 | The imapparameter expects an IMAP\Connection
  instance now; previously, a validimapresource was expected. | 
| 8.0.0 | The unused defaulthostparameter has been removed. | 
