使用php从mysql取数据没有结果

Question

我正在尝试从mysql输出数据，这是一件非常简单且基本的事情，但是尽管数据库包含数据，但输出为空

enter image description here

require 'dbHandler.inc.php';
$city = mysqli_real_escape_string($conn, $_POST['cityName']);
$rowReturned = array();
print_r($_POST);
$sqlText = "SELECT * FROM batdongsan WHERE city =? ";
echo $sqlText;
echo $city;

if($sqlStatement = mysqli_prepare($conn, $sqlText)) {
    mysqli_stmt_bind_param($sqlStatement, "s", $city);
    mysqli_stmt_execute($sqlStatement);
    $result = mysqli_stmt_get_result($sqlStatement);
    while($row = mysqli_fetch_assoc($result)){
        echo "Tran Duy Hung";
    }
    mysqli_stmt_close($sqlStatement);
    mysqli_close($conn);

输出在这里

successfully connect to the db
Array ( [cityName] => Hà Nội [address] => [minPrice] => [maxPrice] => [searchSubmit] => )
SELECT * FROM batdongsan WHERE city =? Hà Nội

Answer 1

此后。...

require 'dbHandler.inc.php';

将其放在您的mysqli_real_connect（）或mysqli_connect（）调用之后...

        @mysqli_query ( $conn, "SET NAMES 'utf8mb4' COLLATE 'utf8mb4_unicode_ci';");