这个问题在这里已经有答案了：

我可以在php中混合mysql api吗(4个答案）
四年前关门了。
我无法从mysql数据库加载信息。我想从我的数据库中加载数据，并将其与php变量进行比较，但它不起作用。每当我加载页面时，都会看到一个白色页面。

有人能帮我吗？

<?php
define('DB_SERVER', '');
define('DB_USERNAME', '');
define('DB_PASSWORD', '');
define('DB_DATABASE', '');

$db = mysqli_connect(DB_SERVER,DB_USERNAME,DB_PASSWORD,DB_DATABASE);

if($_SERVER["REQUEST_METHOD"] == "POST") {

    $myusername = mysqli_real_escape_string($db,$_POST['login']);
    $mypassword = mysqli_real_escape_string($db,hash('ripemd160', $_POST['pass']));
    $sql = "SELECT username, password, active FROM User WHERE username = '$myusername' and password = '$mypassword'";
    $result = mysqli_query($db, $sql);
    while($row = mysql_fetch_assoc($result)) 
    {
        $username = $row['username'];
        $password = $row['password'];
        $active = $row['active'];

        if($username == $myusername){
            if($active == 1)
            {
                session_start();
                $_SESSION["login"] = $myusername;
                echo $_SESSION["login"];

                header("Location: http://www.example.de"); 
            }
            else
            {
            echo "please verify your email";    
            }
        }
    }   
}
else 
{
    header("Location: http://www.fapsite.de/Main/Home/Views/Login/WrongPassword.php");
}

?>