[Colin F]

PHP Code:

$showinvisible = 1; 
// Get who has already viewed this thread 
$currentthread = $DB_site->query_first("SELECT whoviewed FROM ".TABLE_PREFIX."thread WHERE threadid = $threadid"); 
$userinfo = fetch_userinfo($bbuserinfo['userid']); 
if (!$userinfo['invisible'] OR $showinvisible) 
{ 
    if (!empty($currentthread['whoviewed'])) 
    {
        $vieweduserids = explode(",", $currentthread['whoviewed']);
        if (!in_array($bbuserinfo['userid'], $vieweduserids)) 
        {
            $adduserid = ",".$bbuserinfo[userid];
            $DB_site->query("UPDATE " . TABLE_PREFIX . "thread SET whoviewed = CONCAT(whoviewed, '$adduserid') WHERE threadid = $threadid"); 
        } 
    } 
    else 
    { 
        $DB_site->query("UPDATE " . TABLE_PREFIX . "thread SET whoviewed = $bbuserinfo[userid] WHERE threadid = $threadid"); 
    } 
}

// Who has viewed this thread? 
if (empty($currentthread['whoviewed'])) 
{ 
    $thread['viewers'] = '('.strtolower($vbphrase['none']).')'; 
} 
else 
{ 
    $result = $DB_site->query("SELECT userid, username FROM " . TABLE_PREFIX . "user WHERE userid IN ($currentthread[whoviewed])"); 
    $viewers = array(); 
    while ($user = $DB_site->fetch_array($result)) 
    { 
            array_push($viewers, "<a href=\"member.php?".$session['sessionurl'] . "u=".$user['userid'] . "\">" . htmlspecialchars($user['username']) .    "</a>"); 
    } 
    $thread['viewers'] = implode(", ", $viewers); 
} 


Try this maybe...