PHP AND md5 (Opgelost)

<?PHP

	include 'mysql.php' ; 
	
	session_start();

		$username = $_POST['username'];
		$password = md5($_POST['password']);
		
		if (isset($username) && isset($password))
		{
		$query = mysql_query("SELECT * FROM leden WHERE username='$username' and password='$password'");
		
		$numrows = mysql_num_rows($query);
		
		 if ($numrows != 0)
		 {
		
		  while ($row = mysql_fetch_assoc($query))
		  {
		   $username = $_POST['username'];
		   $password = $_POST['password'];
		  }
		 
		  // check to see if they match!
		  if ($username&&$password)
		  {
		   echo "<center>You're in!<br><a href='member.php'>Click here</a> to enter the member page.</center> ";
		   $_SESSION['username'] = $username;
		  }
		 }
		 else 
		 {
		  echo "<center>That user doesn't exist or incorrect password!</center>";
		  exit;
		 }
		}
		else
		{ 
		 die("<center>Please enter and username and password!</center>");
		}
?>

<?PHP
 
	include 'mysql.php' ; 
 
	session_start();
 
		$username = $_POST['username'];
		$password = md5($_POST['password']);
 
		if (isset($username) && isset($password))
		{
		$query = mysql_query("SELECT * FROM leden WHERE username='$username' and password='$password'");
 
		$numrows = mysql_num_rows($query);
 
		 if ($numrows != 0)
		 {
 
		  while ($row = mysql_fetch_assoc($query))
		  {
		   $username = $_POST['username'];
		   $password = $_POST['password'];
		  }
 
		  // check to see if they match!
		  if ($username&&$password)
		  {
		   echo "<center>You're in!<br><a href='member.php'>Click here</a> to enter the member page.</center> ";
		   $_SESSION['username'] = $username;
		  }
		 }
		 else 
		 {
		  echo "<center>That user doesn't exist or incorrect password!</center>";
		  exit;
		 }
		}
		else
		{ 
		 die("<center>Please enter and username and password!</center>");
		}
?>