Untitled

<?php
      session_start();

   $db = mysqli_connect("localhost","root", "", "authentication");

   if (isset($_POST['regbtn'] )) {
    $username = mysql_real_escape_string($_POST['username']);
    $email = mysql_real_escape_string($_POST['email']);
    $password = mysql_real_escape_string($_POST['password']);
    $password2 = mysql_real_escape_string($_POST['password2']);

    if ($password == $password2) {
    $password = md5($password);
    $sql = "INSERT INTO users(username, email, password)
     VALUES('$usrname','$email','$password')";

     mysqli_query($db, $sql);

     $_SESSION['message']="You are now logged in";
     $_SESSION['username']= $username;
    header("location: home.php");


    }else{

            $_SESSION['message']="The two passwords do not match";


        }

         }

        ?>


      <!DOCTYPE html>
      <html>
         <head>
               <title> Registration</title>
               <link rel="stylesheet" type="text/css" href="style.css">
        </head>
      <body>

            <div class="header">
          <h1> Registration </h1>
      </div>
         <form method="post" action="register.php">
            <table>
              <tr>
                  <td> Username:</td>
                  <td><input type="text" name="username" class="textInput">
                </td>
                 </tr>
               <tr>
               <td> Email:</td>
             <td><input type="email" name="email" class="textInput"></td>
             </tr>
             <tr>
                 <td> Password:</td>
             <td><input type="password" name="password" class="textInput">
                 </td>
            </tr>
               <tr>
                <td> Confirm Password:</td>
                    <td><input type="password" name="password2"
         class="textInput"></td>
      </tr>
       <tr>
          <td></td>
        <td><input type="submit" name="regbtn" value="Register"></td>
      </tr>
    </table>


    </form>


     </body>
    </html>