Ciclo mooolto particolare

[DottorZed]

Ecco ho risolto:

$i=0;
foreach ($tabella as $nometab)
{
    $query="SELECT COUNT(user) AS conto FROM $nometab";
    $result = mysql_query($query, $db);
    $row = mysql_fetch_array($result);
    $conto[$i] = $row[conto];
    $i++;

}
echo array_sum($conto);