Plugin to disable Wordpress Emoji functionality

disable-emojis.php

<?php
/*
Plugin Name:  Disable Emojis
Description:  Disable Wordpress emoji functionality
Version:      1.0.0
Author:       Lars Graubner
Author URI:   https://larsgraubner.com
License:      MIT License
*/

function disable_emojis() {
    remove_action('wp_head', 'print_emoji_detection_script', 7);
    remove_action('admin_print_scripts', 'print_emoji_detection_script');
    remove_action('wp_print_styles', 'print_emoji_styles');
    remove_action('admin_print_styles', 'print_emoji_styles');
    remove_filter('the_content_feed', 'wp_staticize_emoji');
    remove_filter('comment_text_rss', 'wp_staticize_emoji');
    remove_filter('wp_mail', 'wp_staticize_emoji_for_email');
    add_filter('tiny_mce_plugins', 'disable_emojis_tinymce');
    add_filter('wp_resource_hints', 'disable_emojis_remove_dns_prefetch', 10, 2);
}
add_action('init', 'disable_emojis');

/**
* Filter function used to remove the tinymce emoji plugin.
*
* @param array $plugins
* @return array Difference betwen the two arrays
*/
function disable_emojis_tinymce($plugins) {
    if (is_array($plugins)) {
        return array_diff($plugins, array('wpemoji'));
    } else {
        return array();
    }
}

/**
* Remove emoji CDN hostname from DNS prefetching hints.
*
* @param array $urls URLs to print for resource hints.
* @param string $relation_type The relation type the URLs are printed for.
* @return array Difference betwen the two arrays.
*/
function disable_emojis_remove_dns_prefetch($urls, $relation_type) {
    if ('dns-prefetch' == $relation_type) {
        /** This filter is documented in wp-includes/formatting.php */
        $emoji_svg_url = apply_filters('emoji_svg_url', 'https://s.w.org/images/core/emoji/2.3/svg/');

        $urls = array_diff($urls, array($emoji_svg_url));
    }

    return $urls;
}