firefly-iii/app/controllers/ProfileController.php

<?php

class ProfileController extends BaseController
{

    public function index()
    {
        return View::make('profile.index');
    }

    public function changePassword()
    {
        return View::make('profile.change-password');
    }

    public function postChangePassword()
    {

        // old, new1, new2
        /** @noinspection PhpUndefinedFieldInspection */
        if (!Hash::check(Input::get('old'), Auth::user()->password)) {
            Session::flash('error', 'Invalid current password!');
            return View::make('profile.change-password');
        }
        if (strlen(Input::get('new1')) == 0 || strlen(Input::get('new2')) == 0) {
            Session::flash('error', 'Do fill in a password!');
            return View::make('profile.change-password');
        }
        if (Input::get('new1') == Input::get('old')) {
            Session::flash('error', 'The idea is to change your password.');
            return View::make('profile.change-password');
        }

        if (Input::get('new1') !== Input::get('new2')) {
            Session::flash('error', 'New passwords do not match!');
            return View::make('profile.change-password');
        }

        // update the user with the new password.
        $password = Hash::make(Input::get('new1'));
        /** @noinspection PhpUndefinedFieldInspection */
        Auth::user()->password = $password;
        /** @noinspection PhpUndefinedMethodInspection */
        Auth::user()->save();
        Session::flash('success', 'Password changed!');
        return Redirect::route('profile');
    }

}