Create Constants in codeigniter
Store the values in constants .You don't need to load constants anywhere, they're automatically autoloaded by itself.
create a file in config-->constants.php
we just define the variables and call them when we actually need.
defined('facebook_link') OR define('facebook_link', 'Url');
defined('twitter_link') OR define('twitter_link', 'url');
defined('youtube_link') OR define('youtube_link', 'url');
Next step:
In View page call the variables
<li>
<a href="<?php echo facebook_link?>" target="_blank">
<i class="fab fa-facebook-f"></i>
</a>
</li>