? во вложенных списках

header("Content-type: text/html; charset=utf-8"

mysql_query("set names utf8");

<?php
 
header("Content-type: text/html; charset=utf-8");
 
mysql_query("set names utf8");
$mysqli = new mysqli("", "", "", "");
if ($mysqli->connect_errno) {
    echo "Не удалось подключиться к MySQL: " . $mysqli->connect_error;
}
 
switch ($_POST['action']){
    case "showRegionForInsert":
        $res = $mysqli->query("SELECT * FROM `tbl_region` WHERE `id_country`='".$_POST['id_country']."' ORDER BY `region` ASC");
        $country = "<select id='region' size='1' name='region'>";
        while ($row = $res->fetch_assoc()){
            $country .= "<option value='".$row['id_region']."'>".$row['region']."</option>";
        }
        $country .= "</select>";
        echo $country;
    break;
 
    case "showCityForInsert":
        $res = $mysqli->query("SELECT * FROM `tbl_city` WHERE `id_region`='".$_POST['id_region']."' ORDER BY `city` ASC");
        $citi = "<select id='citi' size='1' name='citi'>";
        while ($row = $res->fetch_assoc()){
            $citi .= "<option value='".$row['link']."'>".$row['city']."</option>";
        }
        $citi .= "</select>";
        echo $citi;
    break;
};
 
?>