WordPress Plugin: Disable Emojis

cdm-disable-emojis.php

<?php
/**
 * Plugin Name: Disable Emojis
 * Plugin URI: https://gist.github.com/chrisdavidmiles/7727d3c4b8b8967f87e6ff0338b8297c
 * Description: Disable the automatic emoji replacement in post content and prevent the use of the s.w.org emoji cdn on the site.
 * Author: Chris David Miles
 * Version: 0.1
 */


if ( ! defined( 'ABSPATH' ) )  die; 

// Remove dns prefetch of emojis
function disable_emojis_remove_dns_prefetch( $urls, $relation_type ) {
  if ( 'dns-prefetch' == $relation_type ) {
    $emoji_svg_url = apply_filters( 'emoji_svg_url', 'https://s.w.org/images/core/emoji/2/svg/' );
    $urls = array_diff( $urls, array( $emoji_svg_url ) );
  }
  return $urls;
}

// Remove the emoji extension from tinymce if it exists
function disable_emojis_tinymce( $plugins ) {
 if ( is_array( $plugins ) ) {
 return array_diff( $plugins, array( 'wpemoji' ) );
 } else {
 return array();
 }
}

//Remove emojis from posts, wp-admin, and everywhere else
function cdm_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', 'cdm_disable_emojis' );