[SOLVED] login

Not trying to be blunt but considering your other questions here on the forum I believe you are not experienced enough to create a secure login.

PHP Code:

$this->db->where('username', $username);
$this->db->where('password', $password); 


For example, you are storing the password as plaintext in your database, this is bad practice. Always store a (salted) hash of the password and compare the hash of the user input to the stored hash.

I suggest you try to integrate an existing (and proven) solution like community auth or ion auth.