Since version 4.2, WordPress has had full support for emoji emoticons. If you do not want to use them and you do not need them, then I advise you to completely disable this functionality so as not to clutter up the code with unnecessary styles and scripts. This is very important on highly loaded sites, where every extra byte counts.
Add this code to yours funtion.php file:
/// Disable the emoji's
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' );
// Remove from TinyMCE
add_filter( 'tiny_mce_plugins', 'disable_tinymce_emojis' );
// Remove emoji from DNS
add_filter( 'wp_resource_hints', 'disable_emojis_remove_dns_prefetch', 10, 2 );
}
add_action( 'init', 'disable_emojis' );
function disable_tinymce_emojis( $plugins ) {
if ( is_array( $plugins ) ) {
return array_diff( $plugins, array( 'wpemoji' ) );
} else {
return array();
}
}
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/svg/' );
$urls = array_diff( $urls, array( $emoji_svg_url ) );
}
return $urls;
}