$query = mysql_query("select * from site_tasks_helper");
$rs = mysql_fetch_array($query);
$streams_last_verified = $rs["streams_last_verified"];
if (time() > strtotime("+5 minutes", $streams_last_verified)) {
    exec("/web/cgi-bin/php5 -f /path/update_streams.php > /dev/null  &", $arrOutput );
}