Rupture de séquence à 1 niveau PHP Pdo, comment faire?

Code ci-dessous.

$query2 = $conn->prepare("select * from tbl_dwnline where (ref_id='$aids') and 'Level_ref=1'");

$query->execute();
$result = $query->fetchAll();

foreach($result as $row)
{
$id2 = $row['a_id'];

$req = $conn->prepare("select * from tbl_affiliate where (ref_id='$id2')'");

$req->execute();

$res = $req->fetchAll();

foreach($res as $line)
{
$id3 = $row['a_id'];
$nom= $row['firstname'];

$sqlsave = $conn->prepare("insert into tbl_dwnline ('ref_id','a_id','firstname') values ('$aids','$id3','$nom')");

$sqlsave->execute();
}