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页面错误代码：

SQL Error: SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known

Warning: Undefined variable $mysql in .../phplogin/register.php on line 11

Fatal error: Uncaught Error: Call to a member function prepare() on null in .../www/phplogin/register.php:11 Stack trace: #0 {main} thrown in .../phplogin/register.php on line 11

register.php 中的代码 [pw、pw2 和用户名等变量在文件的 html 部分中定义，我无法在此处插入]：

<?php
    if(isset($_POST['submit'])) {require("mysql.php");
        $stmt = $mysql->prepare("SELECT * FROM accounts WHERE USERNAME = :user");// Check username
        $stmt->bindParam(":user", $_POST['username']);
        $stmt->execute();
        $count = $stmt->rowCount();
        if($count == 0) {
            // Username not used
            if($_POST['pw'] == $_POST['pw2']) {
                //User anlegen
                $stmt = $mysql->prepare("INSERT INTO accounts (USERNAME, PASSWORD) VALUES (:user, :pw");
                $stmt->bindParam(":user", $_POST['username']);
                $hash = password_hash($_POST['pw'], PASSWORD_BCRYPT);
                $stmt->bindParam(":pw", $hash);
                $stmt->execute();
                echo "Dein Account wurde angelegt"; // Added account into database
            } else {
                echo "Passwörter stimmen nicht überein"; // pw and pw2 are not the same
            }
        } else {
            echo "Username bereits vergeben"; // Username used already
        }
    }
    ?>

mysql.php 中的代码：

<?php
$host = '[the host]';
$name = '[the database name]';
$user = '[the user]';
$password = '[the user password]';

try {
    $mysql = new PDO("mysql:host=§host;dbname=$name", $user, $password);
} catch (PDOException $e) {
    echo "SQL Error: ".$e->getMessage();
}
?>

我在自由式计划中使用托管程序，所以我不能只重新启动数据库服务器。

我写这个来创建表：CREATE TABLE accounts (USERNAME varchar(255) UNIQUE, PASSWORD varchar(255));

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