index.php

<?php
    $connection = mysqli_connect("localhost", "root", "");
    $db = mysqli_select_db($connection,"eventon");

    if(isset($_POST['login'])){
        $query = "select * from users where email = '$_POST[email]' AND password = '$_POST[password]'";
        $query_run = mysqli_query($connection,$query);
        if(mysqli_num_rows($query_run)){
            while($row = mysqli_fetch_assoc($query_run)){
                echo "<script>
                window.location.href = 'user_dashboard.php';
                </script>";
            }
        }
        else{
            echo "<script>alert('Please Enter correct email id and password');
            window.location.href = 'index.php';
            </script>";
        }
    }    
?>
<!DOCTYPE html>
<html lang="en" dir="ltr">
    <head>
        <meta charset="utf-8">
        <title>EventON</title>
        <!-- Bootstrap files -->
        <link rel="stylesheet" type="text/css" href="bootstrap-4.4.1/css/bootstrap.min.css">
        <script src="bootstrap-4.4.1/js/bootstrap.min.js" charset="utf-8"></script>
        <!-- CSS File -->
        <link rel="stylesheet" href="css/style.css">
    </head>
    <body>
       <!-- Header section code start here -->
       <div class="row" id="header">
           <div class="col-md-4">
           </div>
           <div class="col-md-4">
               <h3>EventON</h3>
           </div>
           <div class="col-md-4">
           </div>
        </div>

        <!-- Login form code starts here -->
        <section id="login_form">
            <div class="row">
                <div class="col-md-4 m-auto block">
                    <center><h4>Login form</h4></center>
                    <form action="index.php" method="post">
                        <div class="form-group">
                            <label>Email ID:</label>
                                <input class="form-control" type="text" name="email" placeholder="Enter your email">
                        </div>
                        <div class="form-group">
                            <label>Password:</label>
                                <input class="form-control" type="password" name="password" placeholder="Enter your Password">
                        </div>
                        <button class="btn btn-primary" type="submit" name="login">Login</button> 
                    </form>
                    <a href="register.php">Click here to register</a>
                </div>
            </div>
        </section>        
     </body>
</html>
