Description:
------------
---
From manual page: http://www.php.net/function.imap-fetch-overview#refsect1-
function.imap-fetch-overview-returnvalues

imap_fetchoverview returns all the header fields but for message id there is no 
value, below is the code i am using-:
<?php 

$m_username="example@gmail.com";
$m_password="xxxxx";

$mbox=imap_open('{imap.gmail.com:993/imap/ssl}[Gmail]/Spam', $m_username, 
$m_password);
$MC = imap_check($mbox);

// Fetch an overview for all messages in SPAM
$overview = imap_fetch_overview($mbox,"1:{$MC->Nmsgs}",0);
echo '<pre>';
print_r($overview);
exit;
?>
below is it's output-:
Array
(
    [0] => stdClass Object
        (
            [subject] => hello test
            [from] => ABCD 
            [to] => example@gmail.com
            [date] => Mon, 24 Jun 2013 15:01:07 +0100
            [message_id] => 
            [size] => 1821
            [uid] => 2814
            [msgno] => 1
            [recent] => 0
            [flagged] => 0
            [answered] => 0
            [deleted] => 0
            [seen] => 0
            [draft] => 0
            [udate] => 1372082473
        )

    [1] => stdClass Object
        (
            [subject] => hello test
            [from] => ABCD 
            [to] => example@gmail.com
            [date] => Mon, 24 Jun 2013 15:10:03 +0100
            [message_id] => 
            [size] => 20823
            [uid] => 2815
            [msgno] => 2
            [recent] => 0
            [flagged] => 0
            [answered] => 0
            [deleted] => 0
            [seen] => 0
            [draft] => 0
            [udate] => 1372083053
---
for some other email id this code returns message id but not for all emails out 
of 77 message id is returned for 20