disable-emoji.php

<?php
/**
 * Plugin Name: Disable Emoji
 * Plugin URI: https://github.com/felixarntz/felixarntz-mu-plugins
 * Description: Removes emoji script and related logic.
 * Author: Felix Arntz
 * Author URI: https://felix-arntz.me
 * License: GPLv2 or later
 * License URI: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * Text Domain: felixarntz-mu-plugins
 *
 * @package felixarntz-mu-plugins
 */

namespace Felix_Arntz\MU_Plugins;

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}

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( 'emoji_svg_url', '__return_false' );