$arr = array();
foreach($b as $bdeger) {
$temp = array();
foreach($a as $adeger) {
$temp[] = $adeger;
}
$arr[$bdeger] = $temp;

}

$sql = "";
foreach($arr as $t=>$tkey) {
foreach($t as $bb) {
$sql . = "insert into tablo (a,b) values('".$bb."','".$tkey."')";
}

}