old/application/views/admin/footer.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');
?>
<!-- footer content -->
<footer>
    <div class="pull-right">
        KingOfDog Admin Panel | &copy; <?= date('Y') ?> KingOfDog
    </div>
    <div class="clearfix"></div>
</footer>
<!-- /footer content -->
</div>
</div>

<script src="/assets/js/lib/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
<script src="/assets/js/lib/tinymce5/tinymce.min.js"></script>

<?php
    $scripts = [
        'lib/jquery.min.js',
        'lib/bootstrap-3.3.7.min.js',
        'lib/datatables.js',
        'lib/jquery.tagsinput.min.js',
        'lib/moment.min.js',
        'lib/bootstrap-datetimepicker.min.js',
        'fullcalendar/fullcalendar.min.js',
        'fullcalendar/lang/de.js',
        'lib/jquery.mCustomScrollbar.min.js',
        'custom.js'
    ];
    if(isset($additionalScripts)) {
        foreach ($additionalScripts as $additionalScript) {
            $scripts[] = $additionalScript;
        }
    }
    $scriptName = join(',', $scripts);
    $scriptName = base_url("combine.php?type=javascript&files=" . $scriptName);
?>

<script src="<?= $scriptName ?>"></script>

</body>
</html>