disable_emoji.php

function disable_wp_emojicons() {

    // all actions related to emojis
    remove_action( 'admin_print_styles', 'print_emoji_styles' );
    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_filter( 'wp_mail', 'wp_staticize_emoji_for_email' );
    remove_filter( 'the_content_feed', 'wp_staticize_emoji' );
    remove_filter( 'comment_text_rss', 'wp_staticize_emoji' );

    // filter to remove TinyMCE emojis
    add_filter( 'tiny_mce_plugins', 'disable_emojicons_tinymce' );
}
add_action( 'init', 'disable_wp_emojicons' );