Accessing CSS and JS for views

You don't show how you assign a value to the variable $base_url.

Could it be that when you typed

Code:

<script type="text/javascript" src="<?php echo $base_url . "assets/js/mdb.min.js"?>"></script>

you really meant this?

Code:

<script type="text/javascript" src="<?php echo base_url("assets/js/mdb.min.js"); ?>"></script>