Disable Emojis in WordPress

disable-emojis.php

/**
 * Disable the emoji's.
 */
function themeslug_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', 'themeslug_disable_emojis_tinymce' );
	add_filter( 'wp_resource_hints', 'themeslug_disable_emojis_remove_dns_prefetch', 10, 2 );
}
add_action( 'init', 'themeslug_disable_emojis' );

/**
 * Filter function used to remove the tinymce emoji plugin.
 */
function themeslug_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.
 */
function themeslug_disable_emojis_remove_dns_prefetch( $urls, $relation_type ) {
	if ( 'dns-prefetch' == $relation_type ) {
		// Strip out any URLs referencing the WordPress.org emoji location
		$emoji_svg_url_bit = 'https://s.w.org/images/core/emoji/';
		foreach ( $urls as $key => $url ) {
			if ( strpos( $url, $emoji_svg_url_bit ) !== false ) {
				unset( $urls[$key] );
			}
		}
	}

	return $urls;
}