Developer filter to generate thumbnails with the CloudFlare Image CDN

cloudflare_thumbnails.php

<?php
defined('MVC_FRAMEWORK') or die;

/**
 * Re-writes image URLs to the CloudFlare Image CDN
 * https://developers.cloudflare.com/images/about/
 */
function jreviews_cloudflare_cdn_thumbnails ($attr, $params = [])
{
    // Skip if thumbnails are not yet generated 
    if ( 
		false !== strpos($attr['src'], 'admin-ajax.php')
		||
		false !== strpos($attr['src'], 'com_jreviews')
	) {
        return $attr;
    }

    if ( false === strpos($attr['src'], 'thumbnail') )
    {
        return $attr;
    }
   	

    $width = !empty($attr['width']) ? $attr['width'] : 640;
   	
    $attr['src'] = str_replace(WWW_ROOT, WWW_ROOT."cdn-cgi/image/width={$width},quality=100,metadata=copyright,f=auto,fit=scale-down/", $attr['src']);
	
    // Replace '/thumbnail/' with '/original/' and remove thumbnail size
    $attr['src'] = preg_replace('/\/thumbnail\/[\s\S]+?\//', '/original/', $attr['src']);

    return $attr;
}

Clickfwd\Hook\Filter::add('image_attributes_before_render', 'jreviews_cloudflare_cdn_thumbnails', $priority = 5);

The filter allows modifying the local stored image URLs to load them from a different domain when using a CDN (e.g. CloudFlare)

To use this filter:

1. Upload the above file to jreviews_overrides/filters
2. Add the line below to jreviews_overrides/filter_functions.php, if you are not using filters yet, read the documentation on Getting Started with JReviews developer filters

require_once "cloudflare_thumbnails.php";

3. Check the available URL parameters from CloudFlare's documentation and make any changes you need.