PSR-0 style class with static methods to delete the SWIFT caches on comment approval.

ClearSwiftCacheCommentApproved.php

<?php
/**
 * PSR-0 style class with static methods to delete the SWIFT caches on comment approval.
 *
 * To make this PSR-4 add a namespace, and prefix Swift_Performance_Cache with a \
 * I think its much better that way and saves the much larger Class name.
 *
 * I've included the init at the bottom, but normally I would have that in a place with all
 * other calls so that they are easily visible, like the functions.php
 *
 * @Author Andrew Killen
 */

class ClearSwiftCacheCommentApproved {
    public static function init(){
        add_action('transition_comment_status', [__CLASS__ , 'approve_comments'], 10, 2);
    }

    /**
     * Will try to delete all caches if the Swift Plugin is installed and a comment is approved.
     *
     * @param string $new_status
     * @param string $old_status
     * @return void
     */
    function approve_comments($new_status, $old_status) {
        if($old_status != $new_status && $new_status == 'approved' && class_exists('Swift_Performance_Cache') ){            
            Swift_Performance_Cache::clear_all_cache();
            
        }
    }
}


ClearSwiftCacheCommentApproved::init();