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Unity Login System With PHP and MySQL

0 Comments - Oct 25, 2019
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In this tutorial, I will be showing how to create a login system in Unity using PHP and MySQL.

This tutorial requires a server with cPanel along with PHP and MySQLi (improved version of MySQL).

Do not have a server yet? Feel free to check the affordable premium hosting by Liquid Web or a cheaper alternative here.

Step 1: Set Up MySQL Database

  • Login into cPanel
  • Click on MySQL Databases in the DATABASES section

  • Under the "Create New Database" section type the name for your database then click "Create Database"

After the database is created we need to create a user that will be associated with it:

  • Type Username under the "MySQL Users" section then type the password (or preferably use the Password Generator to generate a strong password). Don't forget to save the password somewhere, it will be needed later.

Lastly, we need to assign a user to a database with a specific set of permissions.

  • Under the "Add User To Database" section select the newly created user and database then click "Add"

After clicking "Add" you will be presented with a list of Privileges. Only select the privileges that you are planning to use in the future. The most common are DELETE, SELECT, INSERT, and UPDATE:

  • Click "Make Changes" to finalize

Step 2: Create MySQL Table

MySQL table will store the values provided by the users, such as username, email, password, etc.

  • Click on "phpMyAdmin" under DATABASES section

  • Click on the newly created database then click on the SQL tab

  • Paste the code below into the query editor then click "Go"
SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET AUTOCOMMIT = 0;
START TRANSACTION;
SET time_zone = "+00:00";

--
-- Table structure for table `sc_users`
--

CREATE TABLE `sc_users` (
  `user_id` int(11) NOT NULL,
  `username` varchar(20) CHARACTER SET utf8 NOT NULL,
  `email` varchar(254) CHARACTER SET utf8 NOT NULL,
  `password` char(60) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
  `registration_date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

--
-- Indexes for table `sc_users`
--
ALTER TABLE `sc_users`
  ADD PRIMARY KEY (`user_id`),
  ADD UNIQUE KEY `username` (`username`),
  ADD UNIQUE KEY `email` (`email`);

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

The query above will create a new table 'sc_users' which will store the user data.

Step 3: Program Server-Side Logic

Server-side logic will consist of PHP scripts that will receive and process the Post data from Unity.

The first file is database.php which will connect to MySQL database using PHP MySQLi extension.

database.php

<?php
	$host = "localhost"; // Host name 
	$db_username = "DATABASE_USER"; // Mysql username 
	$db_password = "USER_PASSWORD"; // Mysql password 
	$db_name = "DATABASE_NAME"; // Database name 

	$mysqli_conection = mysqli_connect($host, $db_username, $db_password, $db_name)or die("cannot connect"); 
?>

Replace DATABASE_USER, USER_PASSWORD, and DATABASE_NAME with your values.

The second file is register.php. This file will receive post data from Unity and insert a new user record into a database table.

register.php

<?php
	if(isset($_POST["email"]) && isset($_POST["username"]) && isset($_POST["password1"]) && isset($_POST["password2"])){
		$errors = array();
		
		$emailMaxLength = 254;
		$usernameMaxLength = 20;
		$usernameMinLength = 3;
		$passwordMaxLength = 19;
		$passwordMinLength = 5;
		
		$email = strtolower($_POST["email"]);
		$username = $_POST["username"];
		$password1 = $_POST["password1"];
		$password2 = $_POST["password2"];
		
		//Validate email
		if(preg_match('/\s/', $email)){
			$errors[] = "Email can't have spaces";
		}else{
			if(!validate_email_address($email)){
				$errors[] = "Invalid email";
			}else{
				if(strlen($email) > $emailMaxLength){
					$errors[] = "Email is too long, must be equal or under " . strval($emailMaxLength) . " characters";
				}
			}
		}
		
		//Validate username
		if(strlen($username) > $usernameMaxLength || strlen($username) < $usernameMinLength){
			$errors[] = "Incorrect username length, must be between " . strval($usernameMinLength) . " and " . strval($usernameMaxLength) . " characters";
		}else{
			if(!ctype_alnum ($username)){
				$errors[] = "Username must be alphanumeric";
			}
		}
		
		//Validate password
		if($password1 != $password2){
			$errors[] = "Passwords do not match";
		}else{
			if(preg_match('/\s/', $password1)){
				$errors[] = "Password can't have spaces";
			}else{
				if(strlen($password1) > $passwordMaxLength || strlen($password1) < $passwordMinLength){
					$errors[] = "Incorrect password length, must be between " . strval($passwordMinLength) . " and " . strval($passwordMaxLength) . " characters";
				}else{
					if(!preg_match('/[A-Za-z]/', $password1) || !preg_match('/[0-9]/', $password1)){
						$errors[] = "Password must contain atleast 1 letter and 1 number";
					}
				}
			}
		}
		
		//Check if there is user already registered with the same email or username
		if(count($errors) == 0){
			//Connect to database
			require dirname(__FILE__) . '/database.php';
			
			if ($stmt = $mysqli_conection->prepare("SELECT username, email FROM sc_users WHERE email = ? OR 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 */
						$stmt->bind_result($username_tmp, $email_tmp);

						/* fetch value */
						$stmt->fetch();
						
						if($email_tmp == $email){
							$errors[] = "User with this email already exist.";
						}
						else if($username_tmp == $username){
							$errors[] = "User with this name already exist.";
						}
					}
					
					/* close statement */
					$stmt->close();
					
				}else{
					$errors[] = "Something went wrong, please try again.";
				}
			}else{
				$errors[] = "Something went wrong, please try again.";
			}
		}
		
		//Finalize registration
		if(count($errors) == 0){
			$hashedPassword = password_hash($password1, PASSWORD_BCRYPT);
			if ($stmt = $mysqli_conection->prepare("INSERT INTO sc_users (username, email, password) VALUES(?, ?, ?)")) {
				
				/* bind parameters for markers */
				$stmt->bind_param('sss', $username, $email, $hashedPassword);
					
				/* 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.";
			}
		}
		
		if(count($errors) > 0){
			echo $errors[0];
		}else{
			echo "Success";
		}
	}else{
		echo "Missing data";
	}
	
	function validate_email_address($email) {
		return preg_match('/^([a-z0-9!#$%&\'*+-\/=?^_`{|}~.]+@[a-z0-9.-]+\.[a-z0-9]+)$/i', $email);
	}
?>

And the last file is login.php which will receive the credentials and check them against the sc_users table.

login.php

<?php
	if(isset($_POST["email"]) && isset($_POST["password"])){
		$errors = array();
		
		$email = $_POST["email"];
		$password = $_POST["password"];
		
		//Connect to database
		require dirname(__FILE__) . '/database.php';
		
		if ($stmt = $mysqli_conection->prepare("SELECT username, email, password FROM sc_users WHERE email = ? LIMIT 1")) {
			
			/* bind parameters for markers */
			$stmt->bind_param('s', $email);
				
			/* execute query */
			if($stmt->execute()){
				
				/* store result */
				$stmt->store_result();

				if($stmt->num_rows > 0){
					/* bind result variables */
					$stmt->bind_result($username_tmp, $email_tmp, $password_hash);

					/* fetch value */
					$stmt->fetch();
					
					if(password_verify ($password, $password_hash)){
						echo "Success" . "|" . $username_tmp . "|" .  $email_tmp;
						
						return;
					}else{
						$errors[] = "Wrong email or password.";
					}
				}else{
					$errors[] = "Wrong email or password.";
				}
				
				/* close statement */
				$stmt->close();
				
			}else{
				$errors[] = "Something went wrong, please try again.";
			}
		}else{
			$errors[] = "Something went wrong, please try again.";
		}
		
		if(count($errors) > 0){
			echo $errors[0];
		}
	}else{
		echo "Missing data";
	}
?>
  • Upload all 3 files to your public_html folder.

Step 4: Program Client Logic in Unity

Client logic will consist of a C# script that will post data to a PHP script.

  • Create a new script in Unity and name it SC_LoginSystem then paste the code below inside it:

SC_LoginSystem.cs

using System.Collections;
using UnityEngine;
using UnityEngine.Networking;

public class SC_LoginSystem : MonoBehaviour
{
    public enum CurrentWindow { Login, Register }
    public CurrentWindow currentWindow = CurrentWindow.Login;

    string loginEmail = "";
    string loginPassword = "";
    string registerEmail = "";
    string registerPassword1 = "";
    string registerPassword2 = "";
    string registerUsername = "";
    string errorMessage = "";

    bool isWorking = false;
    bool registrationCompleted = false;
    bool isLoggedIn = false;

    //Logged-in user data
    string userName = "";
    string userEmail = "";

    string rootURL = "http://YOUR_SITE.COM/"; //Path where php files are located

    void OnGUI()
    {
        if (!isLoggedIn)
        {
            if (currentWindow == CurrentWindow.Login)
            {
                GUI.Window(0, new Rect(Screen.width / 2 - 125, Screen.height / 2 - 115, 250, 230), LoginWindow, "Login");
            }
            if (currentWindow == CurrentWindow.Register)
            {
                GUI.Window(0, new Rect(Screen.width / 2 - 125, Screen.height / 2 - 165, 250, 330), RegisterWindow, "Register");
            }
        }

        GUI.Label(new Rect(5, 5, 500, 25), "Status: " + (isLoggedIn ? "Logged-in Username: " + userName + " Email: " + userEmail : "Logged-out"));
        if (isLoggedIn)
        {
            if (GUI.Button(new Rect(5, 30, 100, 25), "Log Out"))
            {
                isLoggedIn = false;
                userName = "";
                userEmail = "";
                currentWindow = CurrentWindow.Login;
            }
        }
    }

    void LoginWindow(int index)
    {
        if (isWorking)
        {
            GUI.enabled = false;
        }

        if (errorMessage != "")
        {
            GUI.color = Color.red;
            GUILayout.Label(errorMessage);
        }
        if (registrationCompleted)
        {
            GUI.color = Color.green;
            GUILayout.Label("Registration Completed!");
        }

        GUI.color = Color.white;
        GUILayout.Label("Email:");
        loginEmail = GUILayout.TextField(loginEmail);
        GUILayout.Label("Password:");
        loginPassword = GUILayout.PasswordField(loginPassword, '*');

        GUILayout.Space(5);

        if (GUILayout.Button("Submit", GUILayout.Width(85)))
        {
            StartCoroutine(LoginEnumerator());
        }

        GUILayout.FlexibleSpace();

        GUILayout.Label("Do not have account?");
        if (GUILayout.Button("Register", GUILayout.Width(125)))
        {
            ResetValues();
            currentWindow = CurrentWindow.Register;
        }
    }

    void RegisterWindow(int index)
    {
        if (isWorking)
        {
            GUI.enabled = false;
        }

        if (errorMessage != "")
        {
            GUI.color = Color.red;
            GUILayout.Label(errorMessage);
        }

        GUI.color = Color.white;
        GUILayout.Label("Email:");
        registerEmail = GUILayout.TextField(registerEmail, 254);
        GUILayout.Label("Username:");
        registerUsername = GUILayout.TextField(registerUsername, 20);
        GUILayout.Label("Password:");
        registerPassword1 = GUILayout.PasswordField(registerPassword1, '*', 19);
        GUILayout.Label("Password Again:");
        registerPassword2 = GUILayout.PasswordField(registerPassword2, '*', 19);

        GUILayout.Space(5);

        if (GUILayout.Button("Submit", GUILayout.Width(85)))
        {
            StartCoroutine(RegisterEnumerator());
        }

        GUILayout.FlexibleSpace();

        GUILayout.Label("Already have an account?");
        if (GUILayout.Button("Login", GUILayout.Width(125)))
        {
            ResetValues();
            currentWindow = CurrentWindow.Login;
        }
    }

    IEnumerator RegisterEnumerator()
    {
        isWorking = true;
        registrationCompleted = false;
        errorMessage = "";

        WWWForm form = new WWWForm();
        form.AddField("email", registerEmail);
        form.AddField("username", registerUsername);
        form.AddField("password1", registerPassword1);
        form.AddField("password2", registerPassword2);

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

            if (www.result != UnityWebRequest.Result.Success)
            {
                errorMessage = www.error;
            }
            else
            {
                string responseText = www.downloadHandler.text;

                if (responseText.StartsWith("Success"))
                {
                    ResetValues();
                    registrationCompleted = true;
                    currentWindow = CurrentWindow.Login;
                }
                else
                {
                    errorMessage = responseText;
                }
            }
        }

        isWorking = false;
    }

    IEnumerator LoginEnumerator()
    {
        isWorking = true;
        registrationCompleted = false;
        errorMessage = "";

        WWWForm form = new WWWForm();
        form.AddField("email", loginEmail);
        form.AddField("password", loginPassword);

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

            if (www.result != UnityWebRequest.Result.Success)
            {
                errorMessage = www.error;
            }
            else
            {
                string responseText = www.downloadHandler.text;

                if (responseText.StartsWith("Success"))
                {
                    string[] dataChunks = responseText.Split('|');
                    userName = dataChunks[1];
                    userEmail = dataChunks[2];
                    isLoggedIn = true;

                    ResetValues();
                }
                else
                {
                    errorMessage = responseText;
                }
            }
        }

        isWorking = false;
    }

    void ResetValues()
    {
        errorMessage = "";
        loginEmail = "";
        loginPassword = "";
        registerEmail = "";
        registerPassword1 = "";
        registerPassword2 = "";
        registerUsername = "";
    }
}

Replace http://YOUR_SITE.COM/ with your value (This should be a root path where you uploaded PHP files). Also, make sure to use https if your server has an SSL Certificate installed.

  • Create a new GameObject and name it LoginSystem
  • Attach to SC_LoginSystem to LoginSystem Object

Press Play then click Register to create a new account or provide credentials to log in.

We have a continuation of this tutorial on how to an online leaderboard, check it here.

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