Untitled

<?php
session_start();

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

 if( isset($_POST['register_btn']))
 {

 $username = mysqli_real_escape_string($_POST['username']);
 $email = mysqli_real_escape_string($_POST['email']);
 $password = mysqli_real_escape_string($_POST['password']);
 $password2 = mysqli_real_escape_string($_POST['password2']);

	 if ($password == $password2)
	 {
		 $password = md5($password);
		 $sql = "INSERT INTO users (username, email ,password) VALUES ('$username', '$email', '$password')";
		 mysqli_query($db, $sql);
		  $_SESSION['message'] = "You are now logged in" ;
		  $_SESSION['username'] = $username;
		  header("location: glowna.html");
	 }else
	 {
		 $_SESSION['message'] = "The two password do not match" ;


	 }
 }

?>


<!DOCTYPE html>
<html>
<head>
                   <title>rejestracja</title>
</head>
<body background="img/tlo.jpg">
<div class="header">
                  <h1>Rejestracja</h1>
</div>
        <form method="post" action="register.php">
<table>
      <tr>
	  <td>Nazwa użytkownika:</td>
	          <td><input type="text" name="username" class="textInput"></td>
	  </tr>
	  <tr>
	  <td>E-mail:</td>
	           <td><input type="email" name="email" class="textInput"></td>
	  </tr>
	  <tr>
	  <td>Hasło:</td>
	            <td><input type="password" name="password" class="textInput"></td>
	  </tr>

	  <tr>
	           <td>Potwierdź hasło:</td>
	  <td><input type="password" name="password2" class="textInput"></td>
	  </tr>

	  <tr>
	  <td></td>
	           <td><input type="submit" name="register_btn" value="Rejestruj"></td>
	  </tr>

</table>
</form>
</body>
</html>