problemi accesso alla casella imap

[astros3]

$stream = imap_open(
    "{imap.googlemail.com:993/imap/ssl/novalidate-cert}",
    $user,
    $pass
);
$MC = imap_check($stream);
$privacy = true;

foreach (imap_fetch_overview($stream,"1:{$MC->Nmsgs}") as $msg) {
    $overview = imap_fetch_overview(
        $stream,
        $msg->uid,
        FT_UID
    );
    $to = $overview[0]->to;// RIGA 18

    printf(
        "To: %s (UID: %s)\n",
        !$privacy ? $to : '...',
        $msg->uid
    );
}

// asset()?
asset();// boh, mai sentita prima 

To: ... (UID: 31761)
To: ... (UID: 31762)
To: ... (UID: 31763)
PHP Notice:  Undefined property: stdClass::$to in /mnt/shared-ntfs/Downloads/imap-google/test.php on line 18
To: ... (UID: 31764)
PHP Notice:  Undefined property: stdClass::$to in /mnt/shared-ntfs/Downloads/imap-google/test.php on line 18
PHP Fatal error:  Uncaught Error: Call to undefined function asset() in /mnt/shared-ntfs/Downloads/imap-google/test.php:28
Stack trace:
#0 {main}
  thrown in /mnt/shared-ntfs/Downloads/imap-google/test.php on line 28