PHP查询未运行000webhost托管

Question

我写了一个php文件作为我项目的一部分。我使用xampp来模拟数据库并测试我的php。以下代码在xampp上运行完美，但在我托管数据的000webhost上运行不正常。凭证是可以的，因为它响应操作失败回声。此外，xampp和000webhost上的数据库也是精确副本。感谢。

    <?php
$dbuser = "a7564419_giot";
$dbhost = "mysql11.000webhost.com";
$dbpass = "xxxx";
$dbname = "a7564419_giot";

//$dbuser = "root";
//$dbpass = "";
//$dbhost = "localhost";

//$dbname = "test_db";

$dberror = "Conncection failed!";
$conn = mysqli_connect($dbhost, $dbuser, $dbpass,$dbname) or die($dberror);


    //$url = $_GET['url'];
    //$url = (int)$url;


            //$name = $_GET['Username'];
            //$pass = $_GET['Password'];
            //$add = $_GET['Address'];
            //$Dev1 = (int)$_GET['Device1'];
            //$Dev2 = (int)$_GET['Device2'];
            //$Dev3 = (int)$_GET['Device3'];
            //$Dev4 = (int)$_GET['Device4'];
            $query = "INSERT INTO 'users' (un, pw) VALUES ('manav1', 'abc')";
            $result = mysqli_query($conn, $query) OR die("Operation Failed!!");
mysqli_close($conn);
?>