wp/app/themes/dwp/functions.php

<?php
// ############### require ################## //

//require get_stylesheet_directory() . '/inc/cust-func.php';

// ############### wp_head ################## //

remove_action('wp_head', 'index_rel_link' );
remove_action('wp_head', 'rel_canonical');
remove_action('wp_head', 'start_post_rel_link', 10);
remove_action('wp_head', 'adjacent_posts_rel_link_wp_head', 10);
remove_action('wp_head', 'wp_shortlink_wp_head', 10);
remove_action('wp_head', 'parent_post_rel_link', 10);
remove_action('wp_head', 'rsd_link');
remove_action('wp_head', 'wlwmanifest_link');
remove_action('wp_head', 'wp_generator');
remove_action('wp_head', 'feed_links_extra', 3 );
remove_action('wp_head', 'feed_links', 2 );
remove_action('wp_head', 'wp_oembed_add_discovery_links', 10);
remove_action('wp_head', 'wp_oembed_add_host_js', 10);
remove_action('wp_head', 'rest_output_link_wp_head', 10);
remove_action('template_redirect', 'rest_output_link_header', 11, 0);

function dwp_remove_wp_ver_css_js( $src ) {
    if ( strpos( $src, 'ver=' ) )
        $src = remove_query_arg( 'ver', $src );
    return $src;
}
add_filter( 'style_loader_src', 'dwp_remove_wp_ver_css_js', 9999 );
add_filter( 'script_loader_src', 'dwp_remove_wp_ver_css_js', 9999 );

add_filter( 'xmlrpc_enabled', '__return_false' );
add_filter( 'wp_headers', 'dwp_disable_x_pingback' );
function dwp_disable_x_pingback( $headers ) {
  unset( $headers['X-Pingback'] );
  return $headers;
}

// ###############  Emojis  ################## //
function dwp_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( 'emoji_svg_url', '__return_false' );
}
add_action( 'init', 'dwp_disable_emojis' );

// ###############  Emojis  ################## //
add_action( 'admin_menu', 'tc_remove_tools', 99 );
function tc_remove_tools() {
  global $menu;
  global $submenu;
	remove_menu_page( 'tools.php' );
	//remove_submenu_page('edit.php', 'edit-tags.php?taxonomy=category');
	remove_submenu_page('edit.php', 'edit-tags.php?taxonomy=post_tag');
  remove_menu_page('edit-comments.php');
  remove_submenu_page('admin.php', 'admin.php?page=newsletter_main_welcome');
}