Unity在线排行榜教程

在本教程中，我将展示如何在 Unity 的游戏中实现在线排行榜。

这是上一个教程的延续：Unity 使用 PHP 和 MySQL 登录系统。

拥有排行榜是通过增加游戏竞争力来提高可玩性的好方法。

和以前一样，本教程需要一台带有 cPanel 的服务器以及 PHP 和 MySQLi（MySQL 的改进版本）。

请随意检查经济实惠的优质 VPS 托管或更便宜的 共享托管 替代方案。

那么让我们继续吧！

对现有脚本进行修改

如果您按照上面的教程进行操作，您现在将拥有一个名为 'SC_LoginSystem' 的脚本。我们将通过添加一些代码来实现排行榜功能。

  • 打开 'SC_LoginSystem' 脚本

首先，我们首先添加必要的变量：

    //Leaderboard
    Vector2 leaderboardScroll = Vector2.zero;
    bool showLeaderboard = false;
    int currentScore = 0; //It's recommended to obfuscate this value to protect against hacking (search 'obfuscation' on sharpcoderblog.com to learn how to do it)
    int previousScore = 0;
    float submitTimer; //Delay score submission for optimization purposes
    bool submittingScore = false;
    int highestScore = 0;
    int playerRank = -1;
    [System.Serializable]
    public class LeaderboardUser
    {
        public string username;
        public int score;
    }
    LeaderboardUser[] leaderboardUsers;

注意：currentScore 变量是您将在游戏中用于跟踪玩家分数的变量。该值将提交到 server 并存储在数据库中，建议对该值进行 obfuscate 以防止黑客攻击。

接下来，我们添加 2 个枚举器，负责提交分数和检索排行榜。在脚本末尾最后一个括号结束之前添加以下代码：

    //Leaderboard
    IEnumerator SubmitScore(int score_value)
    {
        submittingScore = true;

        print("Submitting Score...");

        WWWForm form = new WWWForm();
        form.AddField("email", userEmail);
        form.AddField("username", userName);
        form.AddField("score", score_value);

        using (UnityWebRequest www = UnityWebRequest.Post(rootURL + "score_submit.php", form))
        {
            yield return www.SendWebRequest();

            if (www.isNetworkError)
            {
                print(www.error);
            }
            else
            {
                string responseText = www.downloadHandler.text;

                if (responseText.StartsWith("Success"))
                {
                    print("New Score Submitted!");
                }
                else
                {
                    print(responseText);
                }
            }
        }

        submittingScore = false;
    }

    IEnumerator GetLeaderboard()
    {
        isWorking = true;

        WWWForm form = new WWWForm();
        form.AddField("email", userEmail);
        form.AddField("username", userName);

        using (UnityWebRequest www = UnityWebRequest.Post(rootURL + "leaderboard.php", form))
        {
            yield return www.SendWebRequest();

            if (www.isNetworkError)
            {
                print(www.error);
            }
            else
            {
                string responseText = www.downloadHandler.text;

                if (responseText.StartsWith("User"))
                {
                    string[] dataChunks = responseText.Split('|');
                    //Retrieve our player score and rank
                    if (dataChunks[0].Contains(","))
                    {
                        string[] tmp = dataChunks[0].Split(',');
                        highestScore = int.Parse(tmp[1]);
                        playerRank = int.Parse(tmp[2]);
                    }
                    else
                    {
                        highestScore = 0;
                        playerRank = -1;
                    }

                    //Retrieve player leaderboard
                    leaderboardUsers = new LeaderboardUser[dataChunks.Length - 1];
                    for(int i = 1; i < dataChunks.Length; i++)
                    {
                        string[] tmp = dataChunks[i].Split(',');
                        LeaderboardUser user = new LeaderboardUser();
                        user.username = tmp[0];
                        user.score = int.Parse(tmp[1]);
                        leaderboardUsers[i - 1] = user;
                    }
                }
                else
                {
                    print(responseText);
                }
            }
        }

        isWorking = false;
    }

接下来是排行榜 UI。在 void OnGUI() 之后添加以下代码：

    //Leaderboard
    void LeaderboardWindow(int index)
    {
        if (isWorking)
        {
            GUILayout.Label("Loading...");
        }
        else
        {
            GUILayout.BeginHorizontal();
            GUI.color = Color.green;
            GUILayout.Label("Your Rank: " + (playerRank > 0 ? playerRank.ToString() : "Not ranked yet"));
            GUILayout.Label("Highest Score: " + highestScore.ToString());
            GUI.color = Color.white;
            GUILayout.EndHorizontal();

            leaderboardScroll = GUILayout.BeginScrollView(leaderboardScroll, false, true);

            for (int i = 0; i < leaderboardUsers.Length; i++)
            {
                GUILayout.BeginHorizontal("box");
                if(leaderboardUsers[i].username == userName)
                {
                    GUI.color = Color.green;
                }
                GUILayout.Label((i + 1).ToString(), GUILayout.Width(30));
                GUILayout.Label(leaderboardUsers[i].username, GUILayout.Width(230));
                GUILayout.Label(leaderboardUsers[i].score.ToString());
                GUI.color = Color.white;
                GUILayout.EndHorizontal();
            }

            GUILayout.EndScrollView();
        }
    }

在 void OnGUI() 内添加以下代码（在右括号之前）：

        //Leaderboard
        if (showLeaderboard)
        {
            GUI.Window(1, new Rect(Screen.width / 2 - 300, Screen.height / 2 - 225, 600, 450), LeaderboardWindow, "Leaderboard");
        }
        if (!isLoggedIn)
        {
            showLeaderboard = false;
            currentScore = 0;
        }
        else
        {
            GUI.Box(new Rect(Screen.width / 2 - 65, 5, 120, 25), currentScore.ToString());

            if (GUI.Button(new Rect(5, 60, 100, 25), "Leaderboard"))
            {
                showLeaderboard = !showLeaderboard;
                if (!isWorking)
                {
                    StartCoroutine(GetLeaderboard());
                }
            }
        }

最后，void Update()，它将包含一个代码，负责在玩家得分发生变化时提交该得分。在脚本开头的所有变量后面添加以下代码：

    //Leaderboard
    void Update()
    {
        if (isLoggedIn)
        {
            //Submit score if it was changed
            if (currentScore != previousScore && !submittingScore)
            {
                if(submitTimer > 0)
                {
                    submitTimer -= Time.deltaTime;
                }
                else
                {
                    previousScore = currentScore;
                    StartCoroutine(SubmitScore(currentScore));
                }
            }
            else
            {
                submitTimer = 3; //Wait 3 seconds when it's time to submit again
            }

            //**Testing** Increase score on key press
            if (Input.GetKeyDown(KeyCode.Q))
            {
                currentScore += 5;
            }
        }
    }

请注意 **Testing** 部分，因为我们没有可玩的游戏，所以我们只需按 Q 来增加分数（如果您已经有带有评分系统的游戏，您可以稍后将其删除，例如.收集硬币+1点等）

当您按下“播放”并登录时，您应该注意到 2 个新元素：'Leaderboard' 按钮和屏幕顶部的分数值。

现在我们开始创建一个 MySQL 表。

创建 MySQL 表

用户分数将存储在单独的 MySQL 表中。

  • 登录控制面板
  • 单击数据库部分下的 "phpMyAdmin"

  • 单击您在上一教程中创建的数据库，然后单击 SQL 选项卡

  • 将以下代码粘贴到查询编辑器中，然后单击 "Go"
SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET AUTOCOMMIT = 0;
START TRANSACTION;
SET time_zone = "+00:00";

--
-- Table structure for table `sc_user_scores`
--

CREATE TABLE `sc_user_scores` (
  `row_id` int(11) NOT NULL,
  `user_id` int(11) NOT NULL,
  `user_score` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

--
-- Indexes for table `sc_user_scores`
--
ALTER TABLE `sc_user_scores`
  ADD PRIMARY KEY (`row_id`),
  ADD UNIQUE KEY `user_id` (`user_id`);

--
-- AUTO_INCREMENT for table `sc_user_scores`
--
ALTER TABLE `sc_user_scores`
  MODIFY `row_id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=1;
COMMIT;

上面的查询将创建一个名为 'sc_user_scores' 的新表，该表将存储最高分数以及 user_id 作为对主 'sc_users' 表的引用。

最后一部分是实现服务器端逻辑。

实现服务器端逻辑

服务器端逻辑将由 PHP 脚本组成，负责接收/存储分数并检索排行榜。

第一个脚本是 score_submit.php。

  • 创建一个新的 PHP 脚本并将以下代码粘贴到其中：

分数_提交.php

<?php
	if(isset($_POST["email"]) && isset($_POST["username"]) && isset($_POST["score"])){
		$errors = array();
		
		$email = $_POST["email"];
		$username = $_POST["username"];
		$submitted_score = intval($_POST["score"]);
		$user_id = -1;
		$current_highscore = -1;

		//Connect to database
		require dirname(__FILE__) . '/database.php';
		
		//Check if the user already registered, retrieve its user_id and score value (if exist)
		if ($stmt = $mysqli_conection->prepare("SELECT u.user_id, 
			(SELECT user_score FROM sc_user_scores WHERE user_id = u.user_id LIMIT 1) as user_score 
			FROM sc_users u WHERE u.email = ? AND u.username = ? LIMIT 1")) {
			
			/* bind parameters for markers */
			$stmt->bind_param('ss', $email, $username);
				
			/* execute query */
			if($stmt->execute()){
				
				/* store result */
				$stmt->store_result();

				if($stmt->num_rows > 0){
				
					/* bind result variables */
					$stmt->bind_result($user_id_tmp, $score_tmp);

					/* fetch value */
					$stmt->fetch();
					
					$user_id = $user_id_tmp;
					$current_highscore = $score_tmp;

				}else{
					$errors[] = "User not found.";
				}
				
				/* close statement */
				$stmt->close();
				
			}else{
				$errors[] = "Something went wrong, please try again.";
			}
		}else{
			$errors[] = "Something went wrong, please try again.";
		}
		
		//Submit new score
		if(count($errors) == 0){
			if(is_null($current_highscore) || $submitted_score > $current_highscore){
				
				if(is_null($current_highscore)){
					//Insert new record
					if ($stmt = $mysqli_conection->prepare("INSERT INTO sc_user_scores (user_id, user_score) VALUES(?, ?)")) {
						
						/* bind parameters for markers */
						$stmt->bind_param('ii', $user_id, $submitted_score);
							
						/* execute query */
						if($stmt->execute()){
							
							/* close statement */
							$stmt->close();
							
						}else{
							$errors[] = "Something went wrong, please try again.";
						}
					}else{
						$errors[] = "Something went wrong, please try again.";
					}
				}else{
					//Update existing record
					if ($stmt = $mysqli_conection->prepare("UPDATE sc_user_scores SET user_score = ? WHERE user_id = ? LIMIT 1")) {
						
						/* bind parameters for markers */
						$stmt->bind_param('ii', $submitted_score, $user_id);
							
						/* execute query */
						if($stmt->execute()){
							
							/* close statement */
							$stmt->close();
							
						}else{
							$errors[] = "Something went wrong, please try again.";
						}
					}else{
						$errors[] = "Something went wrong, please try again.";
					}
				}
				
			}else{
				$errors[] = "Submitted score is lower than the current highscore, skipping...";
			}
		}
		
		if(count($errors) > 0){
			echo $errors[0];
		}else{
			echo "Success";
		}
	}else{
		echo "Missing data";
	}
?>

最后一个脚本是 leaderboard.php。

  • 创建一个新的 PHP 脚本并将以下代码粘贴到其中：

排行榜.php

<?php
	//Retrieve our score along with leaderboard
	if(isset($_POST["email"]) && isset($_POST["username"])){
		$returnData = array();
		
		$email = $_POST["email"];
		$username = $_POST["username"];

		//Connect to database
		require dirname(__FILE__) . '/database.php';
		
		//Get our score and rank
		$returnData[] = "User";
		if ($stmt = $mysqli_conection->prepare("SELECT us.user_score,
			(SELECT COUNT(row_id) FROM sc_user_scores WHERE user_score >= us.user_score LIMIT 1) as rank
			FROM sc_user_scores us
			WHERE us.user_id = (SELECT user_id FROM sc_users WHERE email = ? AND username = ? LIMIT 1) LIMIT 1")) {
			
			/* bind parameters for markers */
			$stmt->bind_param('ss', $email, $username);
				
			/* execute query */
			if($stmt->execute()){
				
				/* store result */
				$stmt->store_result();

				if($stmt->num_rows > 0){
				
					/* bind result variables */
					$stmt->bind_result($score_tmp, $user_rank);

					/* fetch value */
					$stmt->fetch();
					
					//Append 
					$returnData[0] .= "," . $score_tmp . "," . $user_rank;

				}
				
				/* close statement */
				$stmt->close();
				
			}
		}
		
		//Get top 100 players
		if ($stmt = $mysqli_conection->prepare("SELECT u.username, us.user_score 
			FROM sc_users u RIGHT JOIN sc_user_scores us ON u.user_id = us.user_id 
			WHERE u.user_id IS NOT NULL ORDER BY us.user_score DESC LIMIT 100")) {
				
			/* execute query */
			if($stmt->execute()){
				
				$result = $stmt->get_result();

				while ($row = $result->fetch_assoc())
				{
					$returnData[] = $row["username"] . "," . $row["user_score"];
				}
				
				/* close statement */
				$stmt->close();
				
			}
		}
		
		//The returned string will use '|' symbol for separation between player data and ',' for separation inside the player data
		echo implode('|', $returnData);
	}else{
		echo "Missing data";
	}
?>
  • 将score_submit.php 和leaderboard.php 上传到您在上一教程中上传PHP 脚本的同一文件夹中。

一切设置完毕后，当您单击排行榜时，它应该加载您的分数/排名以及根据分数排名前 100 名的玩家：

unity3dunity编程phpmysqlmysqli教程登录注册数据库csharp排行榜插件排序顶部ongui
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