[Smush] - Load site icon meta tags from CDN

wpmudev-smush-site-meta-icons-tags.php

<?php
/**
* Plugin Name: [Smush] - Add support for site icon meta tags
* Plugin URI: https://premium.wpmudev.org/
* Description: Extend existing functionality of Smush to support for site icon meta tags (as of 3.2.4)
* Author: Alessandro Kaounas @ WPMUDEV
* Author URI: https://premium.wpmudev.org/
* License: GPLv2 or later
*/

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

if ( ! class_exists( 'WPMUDEV_Smush_Site_Icon_Meta_Tags' ) ) {
    
    class WPMUDEV_Smush_Site_Icon_Meta_Tags {

        private static $_instance = null;

        public static function get_instance() {

            if( is_null( self::$_instance ) ){
                self::$_instance = new WPMUDEV_Smush_Site_Icon_Meta_Tags();
            }
            return self::$_instance;
            
        }

        private function __construct() {

            $this->init();
            $this->settings = WP_Smush_Settings::get_instance();

        }

        private function init(){
            
			if ( ! class_exists( 'WP_Smush' ) ) {
				return;
            }
            
            add_filter( 'site_icon_meta_tags', array( $this, 'wpmudev_site_icon_meta_tags' ) );

        }

        public function wpmudev_site_icon_meta_tags( $meta_tags ){

            $images = array();

            if ( get_site_icon_url() ) {

                if ( preg_match_all( '/(?:[href|content]=\[\'|"]?(http?s?:?\/\/[^"\']*\.(?:png|jpg|jpeg|gif))[\'|"]?)/is', implode( '', $meta_tags ), $images ) ) {
                    
                    foreach ( $images as $key => $value ) {

                        if( ! $key ){
                            continue;
                        }

                        foreach( $value as $image ){
                            $new_image = WP_Smush::get_instance()->core()->mod->cdn->generate_cdn_url( $image );
                            $meta_tags = str_replace( $image, $new_image, $meta_tags );
                        }

                    }

                }

            }

            return $meta_tags;

        }
      
	}
	
    if ( ! function_exists( 'WPMUDEV_Smush_Site_Icon_Meta_Tags' ) ) {
        
        function WPMUDEV_Smush_Site_Icon_Meta_Tags() {
            return WPMUDEV_Smush_Site_Icon_Meta_Tags::get_instance();
        };

        add_action( 'plugins_loaded', 'WPMUDEV_Smush_Site_Icon_Meta_Tags', 99 );

    }

}