Purge Multiple WordPress Caches in Ideal Order

fd_purge_all_cache.php

<?php

// Clears Page Cache at key moments, e.g., after plugin updates
// Importantly, it clears the page when WP Rocket clears cache
// If Cloudflare page caching is enabled, this clears the nginx page cache before Cloudflare's cache

add_action( 'before_rocket_clean_domain', 'fd_purge_all_cache', 10, 0 ); // Before WP Rocket Cache
add_action( 'upgrader_process_complete', 'fd_purge_all_cache', 10, 0 ); // After plugin updates
add_action( 'activated_plugin', 'fd_purge_all_cache', 10, 0 ); // After plugin activated, doesn't work?
add_action( 'deactivated_plugin', 'fd_purge_all_cache', 10, 0 ); // After plugin deactivated, broken?
add_action( 'switch_theme', 'fd_purge_all_cache', 10, 0 ); // After theme changed, untested


// Purge All Caches
function fd_purge_all_cache()
{

    // CSS Cache (Elementor)
    if ( class_exists( 'Elementor' ) ) {
        do_action( 'elementor/core/files/clear_cache' );
    }
    
    // Used CSS Cache (Perfmatters)
    if ( class_exists( 'Perfmatters\CSS' ) ) {
        Perfmatters\CSS::clear_used_css();
    }    
  
    // Object Cache
    if ( function_exists( 'wp_cache_flush' ) ) {
        wp_cache_flush();
    }
    
    // Page Cache (nginx)
    if ( function_exists( 'purge_all' ) ) {
        global $nginx_purger;
    
        if ( isset( $nginx_purger ) ) {
            $nginx_purger->purge_all();
        }
    }
    
    // Used CSS Cache (WP Rocket)
    wpr_clear_used_css();
}


// Clear Used CSS (WP Rocket)
function wpr_clear_used_css() {
    if ( defined( 'WP_ROCKET_VERSION' ) ) {
        // access rocket's injection container
        $container = apply_filters( 'rocket_container', null );
        // get the rucss subscriber from the container
        $subscriber = $container->get( 'rucss_admin_subscriber' );
        // call the truncate method.
        $subscriber->truncate_used_css();
    }
}

This clears the main caches that may get stuck while using Elementor with Nginx Page Caching, Object Caching, WP Rocket, Perfmatters, and Cloudflare. It's currently dependent on WP Rocket to clear Cloudflare's cache, and currently uses the Nginx Helper and GridPane Redis Object Cache plugins.