Create Login System in PHP with Validation

Create Login System in PHP with Validation

Simple login system in PHP and MySQL with validation. Here you will learn how to create a login in PHP and MySQL with server-side validation.

Here, we will explain how to create a login system in PHP. How you can validate user credentials (email id or password) on the server. Also, we will explain how you can validate data before logged using the MySQL database.

This tutorial helps you an easy way to implement a login system in PHP and MySQL with server-side validation.

Login System in PHP and MySQL

Just follow the few below steps and easily create a login system in PHP and MySQL with validation.

  • First Create a Database Connection File
  • Create Login Form In PHP
  • User Profile file

1. First Create a Database Connection File

In this step, you will create a file name db.php and update the below code into your file.

The below code is used to create a MySQL database connection in PHP. When we insert form data into MySQL database, there we will include this file:

<?php
    $servername='localhost';
    $username='root';
    $password='';
    $dbname = "my_db";
    $conn=mysqli_connect($servername,$username,$password,"$dbname");
      if(!$conn){
          die('Could not Connect MySql Server:' .mysql_error());
        }
?>

2. Create Login Form In PHP

In this step, we need to create a form, where we accept user email id and password. So you can create a login.php file and update the below code into your file.

The below code is used to show login form and authenticate the user with MySQL database in PHP.

<?php
session_start();

require_once "db.php";

if(isset($_SESSION['user_id'])!="") {
    header("Location: dashboard.php");
}

if (isset($_POST['login'])) {
    $email = mysqli_real_escape_string($conn, $_POST['email']);
    $password = mysqli_real_escape_string($conn, $_POST['password']);

    if(!filter_var($email,FILTER_VALIDATE_EMAIL)) {
        $email_error = "Please Enter Valid Email ID";
    }
    if(strlen($password) < 6) {
        $password_error = "Password must be minimum of 6 characters";
    }  

    $result = mysqli_query($conn, "SELECT * FROM users WHERE email = '" . $email. "' and password = '" . md5($password). "'");
    if ($row = mysqli_fetch_array($result)) {
        $_SESSION['user_id'] = $row['uid'];
        $_SESSION['user_name'] = $row['name'];
        $_SESSION['user_mobile'] = $row['mobile'];
        $_SESSION['user_email'] = $row['email'];
        header("Location: dashboard.php");
    } else {
        $error_message = "Incorrect Email or Password!!!";
    }
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Simple Login Form in PHP with Validation | Tutsmake.com</title>
     <link rel="stylesheet" type="text/css" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
</head>
<body>
    <div class="container">
        <div class="row">
            <div class="col-lg-10">
                <div class="page-header">
                    <h2>Login Form in PHP with Validation</h2>
                </div>
                <p>Please fill all fields in the form</p>
                <span class="text-danger"><?php if (isset($error_message)) echo $error_message; ?></span>
                <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">

                    <div class="form-group ">
                        <label>Email</label>
                        <input type="email" name="email" class="form-control" value="" maxlength="30" required="">
                        <span class="text-danger"><?php if (isset($email_error)) echo $email_error; ?></span>
                    </div>

                    <div class="form-group">
                        <label>Password</label>
                        <input type="password" name="password" class="form-control" value="" maxlength="8" required="">
                        <span class="text-danger"><?php if (isset($password_error)) echo $password_error; ?></span>
                    </div>  
                    
                    <input type="submit" class="btn btn-primary" name="login" value="submit">
                    <br>
                    You don't have account?<a href="registration.php" class="mt-3">Click Here</a>
                    
                    
                </form>
            </div>
        </div>     
    </div>
</body>
</html>

3. User Profile file

In this step, we need to create a new file name dashboard.php and update the below code into your file.

The below code used to show logged in user data.

<?php

    session_start();

    if(isset($_SESSION['user_id']) =="") {
        header("Location: login.php");
    }

?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>User Info Dashboard | Tutsmake.com</title>
    <link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
 
    <div class="container">
        <div class="row">
            <div class="col-lg-8">
                <div class="card">
                  <div class="card-body">
                    <h5 class="card-title">Name :- <?php echo $_SESSION['user_name']?></h5>
                    <p class="card-text">Email :- <?php echo $_SESSION['user_email']?></p>
                    <p class="card-text">Mobile :- <?php echo $_SESSION['user_mobile']?></p>
                    <a href="logout.php" class="btn btn-primary">Logout</a>
                  </div>
                </div>
            </div>
        </div>       
    </div>

</body>
</html>

Conclusion

In this tutorial, you have learned how to create a login system in PHP and MySQL database.

This is a very basic and easy example of creating a login form and authenticate the user to a MySQL database in PHP. In the next article, we will show you how you can create a login and registration application in PHP.

If you have any questions or thoughts to share, use the comment form below to reach us.

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