PHP Sql代码没有运行

Question

尝试获取连接SQL数据库并进行身份验证的代码。

它一直返回“无效的用户名/密码组合”。

以下是代码：

<?php
require_once 'login.php';
$connection = new mysqli( $hn, $un,$pw, $db);
if ($connection->connect_error) die($connection->connect_error);

if (isset($_SERVER['PHP_AUTH_USER']) &&
isset($_SERVER['PHP_AUTH_PW'])) {
    $un_temp= sanitize($_SERVER['PHP_AUTH_USER']);
    $pw_temp= sanitize($_SERVER['PHP_AUTH_PW']);

    $query  = "SELECT * FROM users WHERE username='$un_temp'";
    $result = $connection->query($query);
    if (!$result) die($connection->error);
    else{
        $row = $result->fetch_array(MYSQLI_NUM);

        $salt1 = "qm&h*";
        $salt2 = "pg!@";
        $token = hash('ripemd128', "$salt1$pw_temp$salt2");

        if ($token == $row[3]) echo "$row[0] $row[1] : 
            Hi $row[0], you are now logged in as '$row[2]'";
            else die("Invalid username/password combination");
    }
} else {
    header('WWW-Authenticate: Basic realm="Restricted Section"');
    header('HTTP/1.0 401 Unauthorized');
    die ("Please enter your username and password");
}

$connection->close();

function sanitize($var) {
    $value = stripslashes($var);
    $value = strip_tags($var);
    $value = htmlentities($var);
    return $value;
}
?>