The imap_headerinfo() function in PHP

Posted on Sep 01, 2022

Learn how the imap_headerinfo() function works in PHP

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The PHP imap_headerinfo() function is used to get the header of an email message using the IMAP protocol.

The syntax of the function is as follows:

    IMAP\Connection $imap,
    int $message_num,
    int $from_length = 0,
    int $subject_length = 0
): stdClass|false

The function parameters are as follows:

  • $imap - object instance of the IMAP\Connection class (required)
  • $message_num - the message number you want to read the header from (required)
  • $from_length - the length of characters for the from property (optional)
  • $subject_length - the length of characters for the subject property (optional)

The function will return an object containing the header information. When thereโ€™s an error, it returns false.

To create an $imap object, you need to call the imap_open() function.

The code template for using the imap_headerinfo() is as follows:

// ๐Ÿ‘‡ establish IMAP connection
$url = "{localhost:993/imap/ssl}INBOX";
$id = "";
$pwd = "your email password";
$imap = imap_open($url, $id, $pwd);
print("Connection established. \n");

// ๐Ÿ‘‡ fetching header info with imap_headerinfo()
print("Headers of all messages: \n");
$res = imap_headerinfo($imap, 1);	

// ๐Ÿ‘‡ close the IMAP connection

When you successfully connected to the email server, you should see the header info printed on the screen.

An example of the header object is as follows:

stdClass Object (
[date] => Thu, 22 Aug 2022 20:10:52 +0000 
[message_id] => [toaddress] => **** 
[to] => Array ( ... ) 
[fromaddress] => Sender [from] => Array ( ... ) 
[reply_toaddress] => Sender [reply_to] => Array ( ... ) 
[senderaddress] => Sender [sender] => Array ( ... ) 
[Recent] => [Unseen] => U [Flagged] => 
[Answered] => [Deleted] => [Draft] => [Msgno] => 2 
[MailDate] => 22-Aug-2022 20:10:52 +0000 
[Size] => 4858 [udate] => 1661173852 

Now youโ€™ve learned how the imap_headerinfo() function works in PHP. Nice work! ๐Ÿ‘

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