There is two way you can follow:
1. Looping through the messages
$count = imap_num_msg($connection);
for($msgno = 1; $msgno <= $count; $msgno++) {
$headers = imap_headerinfo($connection, $msgno);
if($headers->Unseen == 'U') {
... do something ...
}
}
2. Using imap_search
There's a flag called UNSEEN which you can use to search for the unread emails. You would call the imap_search function with the UNSEEN flag like so:
$result = imap_search($connection, 'UNSEEN');
If you need to combine this with more search flags, for example searching for messages from me@example.com, you could do this:
$result = imap_search($connection, 'UNSEEN FROM "me@example.com"');
For a complete list of the available flags, refer to the criteria section of the imap_search manual page on the PHP website (www.php.net/imap_search)
Source: http://www.electrictoolbox.com/php-imap-unread-messages/
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