<?php

function ddAuthValidateCredentials($username = null, $password = null) {
    $user = $this->user_model->find($username);
    // Maybe your password is stored in plaintext (BAD) in the database.
    if ( $password == $user['password'] ) {
        return $user['user_id'];
    }
    return null;
}

function ddAuthValidateCredentials($username = null, $password = null) {
    $user = $this->user_model->find($username);
    // Maybe your password is encrypted in the database against a salt
    // for the user. In that case, crypt the password we received
    // with the user's salt and see if it matches.
    if ( crypt($password, $user['salt']) == $user['encrypted_password'] ) {
        return $user['user_id'];
    }
    return null;
}

?>