CDN Integration with Codeigniter

To integrate CodeIgniter PHP framework with CDN, kindly follow the steps below.

• To make the process seamlessly, we recommend to load URL Helper globally by setting it on application/config/autoload.php and include 'url' in the loader.

$autoload['helper'] = array('url');

• Moving next, on config file at application/config/config.php, create the CDN URL variable and in this example, we will be using cdn.onappcdn.com. Please replace with your CDN URL:

$config['base_url'] = 'https://www.example.com/';
$config['cdn_url'] = 'https://cdn.onappcdn.com/';

• Thirdly, you would need to extend the URL Helper by updating this following code:

$config['subclass_prefix'] = 'MY_';

and replacing with ext.

$config['subclass_prefix'] = 'ext.';

• Last but no least, create a new helper file on application/helpers/ext.url_helper.php by extending the base_url functions. It's rewrites all the specifies static contents to CDN URL:

<?php
function base_url($uri)
{
   $currentInstance =& get_instance();

   $cdnUrl = $currentInstance->config->item('cdn_url');

   $extensions = array('css', 'js', 'webp', 'jpg', 'jpeg', 'png', 'gif','pdf');
   $pathParts = pathinfo($uri);

   if (!empty($cdnUrl) && in_array($pathParts['extension'],$extensions)) {
       return $cdnUrl . $uri;
   }
   return $currentInstance->config->base_url($uri);
}
>

 You may also add in any other prefer static filetypes that are required on the code above.