Connect to gmail via IMAP using functions from the IMAP module http://php.net/manual/en/book.imap.php
$mbox = imap_open("{imap.example.org:143}INBOX", "username", "password") or die("can't connect: " . imap_last_error()); $MC = imap_check($mbox); // Fetch an overview for all messages in INBOX $result = imap_fetch_overview($mbox,"1:{$MC->Nmsgs}",0); $seen = 0; $unseen = 0; foreach ($result as $overview) { if($overview->seen){ $counter++; } else { $unseen++; } } imap_close($mbox); echo "Seen $seen, unseen $unseen"
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