Une valeur ne m'est pas renvoyée...

<?php

$jour = date('d');
$mois = date('m');
$annee = date('Y');
$aujourd_hui = mktime(0, 0, 0, $mois, $jour, $annee);
$times_m_5mins = time()-(60*5);

$times_m_24h = time() -(60*60*24);

$pdo_options[PDO::ATTR_ERRMODE] = PDO::ERRMODE_EXCEPTIon', $pdo_options);
$dnns = $bdd->query('select count(ip) as nb from connectes where ip="'.$_SERVER['REMOTE_ADDR'].'"')->fetchColumn();

if($dnns['nb']> 0)
{
$dnns = $bdd->prepare('update connectes set timestamp="'.time().'" where ip="'.$_SERVER['REMOTE_ADDR'].'"');
$dnns->execute();
}
else
{
$dnns = $bdd->prepare('insert into connectes (ip, timestamp) values ("'.$_SERVER['REMOTE_ADDR'].'", "'.time().'")');
$dnns->execute();
}

$dnns2 = $bdd->query('select count(ip) as nb_entrees from connectes WHERE timestamp >="'.$times_m_5mins.'"')->fetchColumn();
$dnns3 = $bdd->query('select count(ip) as nb_jour from connectes WHERE timestamp >="'.$times_m_24h.'"')->fetchColumn();
$dnns4 = $bdd->query('select count(ip) as nbtot from connectes')->fetchColumn();

?>