PHP MySQL无法创建新用户

Question

我在Unity3d中有一个注册表格，如下所示：

IEnumerator CreateAccount()
    {
        //Sending messages to php script
        Debug.Log("button pressed");
        WWWForm Form = new WWWForm();

        Form.AddField("emailPost", CEmail);
        Form.AddField("passwordPost", CPassword);

        WWW CreateAccountWWW = new WWW(CreateAccountUrl, Form);
        // Wait for the php to send a response
        yield return CreateAccountWWW;
        if (CreateAccountWWW.error != null)
        {
            Debug.LogError("Cannot Connect to Account Creation");
            Debug.Log(CreateAccountWWW.error);
        }
        else
        {
            Debug.Log(CreateAccountWWW.text);
            string CreateAccountReturn = CreateAccountWWW.text;
            if (CreateAccountReturn == "Success")
            {
                Debug.Log("Success: Account created");
                currentMenu = "Login";
            }
        }
    }

我的协程看起来像这样：

<?php
$db_name = "mydata";
$mysql_username = "root";
$mysql_password = "";
$server_name = "localhost";
$conn = mysqli_connect($server_name, $mysql_username, $mysql_password, $db_name);
if($conn){
    echo "Connection Succesful";
}
else{
    echo "Connection Not Succesful";
}
?>

我的连接PHP文件如下所示：

<?php
require "conn.php";
$Email = $_POST["emailPost"];
$Password = $_POST["passwordPost"];

if(!$Email || !$Password){
    echo "Empty";
}else{
    $SQL = "SELECT * FROM users WHERE Email = '" . $Email ."'";
    $Result = mysqli_query($conn,$SQL) or die("DB Error");
    $Total = mysqli_num_rows($Result);
    if($Total == 0){
        $insert = "INSERT INTO 'users' ('Email', 'Password') VALUES ('" . $Email . "', MD5('" . $Password . "'))";
        $SQL1 = mysqli_query($conn, $insert);
        echo "Success";
    }else{
        echo "AlreadyUsed"; //if user exists
    }
}

?>

最后我创建新用户的PHP如下所示：

users

我还有一张我的数据库图片：

一切似乎工作得很好，因为我到处都成功触发了。但是新数据不会进入我的{{1}}表。

我做错了什么？