Php 数据库连接无法正常工作

我正在为“刺客”游戏建立一个网站，目前我正在为该网站注册。我正在学习服务器端设置，似乎在使用“register.php”将个人凭据添加到SQL数据库时遇到了问题。当我运行该站点时，register.php页面根本不会出现。你能帮我修改register.php的代码吗？谢谢大家!

<?php 
require_once ("Includes/simplecms-config.php"); 
require_once  ("Includes/connectDB.php");
include("Includes/header.php"); 

if (isset($_POST['submit'])){
    $username = $_POST['username'];
    $email = $_POST['email'];
    $query = "INSERT INTO users (username, password, email, key, iv_size, salt) VALUES (?, ?, ?, ?, ?, ?)";

    function RandomString($length)
    {
        $characters = ’0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ’;
        $randstring = '';
        for ($i = 0; $i < $length; $i++) {
            $randstring = $characters[rand(0, strlen($characters))];
        }
        return $randstring;
    }
    $code = RandomString(25);
    mail($email, "Your code for the Assassin game.", "Your code is: $code");
    $salt = RandomString(8);
    $hashedcode = "";
    for($i=0;$i<5;i++){
        $hashedcode = sha1($hashedcode.$code.$salt);
    }

    $key = pack('H*', "bcb04b7e103a0cd8b54763051cef08bc55abe029fdebae5e1d417e2ffb2a00a3");
    $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);

    $encryptedname = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $name, MCRYPT_MODE_CBC, $iv);
    $encryptedemail = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $email, MCRYPT_MODE_CBC, $iv);
    $encryptedname_base64 = base64_encode($encryptedname);
    $encryptedemail_base64 = base64_encode($encryptedemail);

    $statement = $databaseConnection->prepare($query);
    $statement->bind_param('ssssssi', $encryptedname_base64, $hashedcode, $encryptedemail_base64, $key, $iv_size, $salt);
    $statement->execute();
    $statement->store_result();

    $creationWasSuccessful = $statement->affected_rows == 1 ? true : false;
    if ($creationWasSuccessful)
    {
        $userId = $statement->insert_id;

        $addToUserRoleQuery = "INSERT INTO users_in_roles (user_id, role_id) VALUES (?, ?)";
        $addUserToUserRoleStatement = $databaseConnection->prepare($addToUserRoleQuery);

        $userRoleId = 2;
        $addUserToUserRoleStatement->bind_param('dd', $userId, $userRoleId);
        $addUserToUserRoleStatement->execute();
        $addUserToUserRoleStatement->close();

        $_SESSION['userid'] = $userId;
        $_SESSION['username'] = $username;
        header ("Location: index.php");
    }
    else
    {
        echo "Failed registration";
    }
}
?>

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下一行末尾缺少分号：

mail($email, "Your code for the Assassin game.", "Your code is: $code")//here

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打开错误报告

错误报告（E_ALL）；ini设置（“显示错误”，1）问题是，我不能让它报告错误，因为它只给我一个白色的空白页。我无法通过错误报告查看代码中的错误开始通过在代码中放入“var_dump（$variable_name）”，一次一个，然后移动它来查看代码。或使用“die”（“我在这里”）。\uuuuuu文件\uuuuuu行\uuuuuuu）。从顶部开始！这是我得到“空白页”时使用的。它起作用了！：-）非常感谢。我会继续这样做，试着找出哪里出了问题！仅供参考，PHP在运行完整脚本之前会对其进行解析。所以，您可以将所有函数、类等放在脚本末尾，并在它们前面加上“return”或“exit”语句。使代码看起来更清晰，结构更清晰，更易于维护。