Optimize WordPress. Remove unnecessary code from wp_head. Disable trackbacks and pings. Disable and remove comments on front-end and back-end. Remove oEmbed functionality. Disable emojis on front-end and remove the tinymce emoji plugin. Remove link tags in header. Remove jQuery Migrate #wordpress

optimize-wp.php

<?php

// Remove Unnecessary Code from wp_head
remove_action('wp_head', 'rsd_link');
remove_action('wp_head', 'wlwmanifest_link');
remove_action('wp_head', 'wp_generator');
remove_action( 'wp_head', 'wp_shortlink_wp_head');
remove_action('wp_head', 'start_post_rel_link');
remove_action('wp_head', 'index_rel_link');
remove_action('wp_head', 'adjacent_posts_rel_link');
remove_action( 'wp_head', 'feed_links', 2 );

//Remove JQuery migrate
function remove_jquery_migrate($scripts)
{
    if (!is_admin() && isset($scripts->registered['jquery'])) {
        $script = $scripts->registered['jquery'];
        
        if ($script->deps) { // Check whether the script has any dependencies
            $script->deps = array_diff($script->deps, array(
                'jquery-migrate'
            ));
        }
    }
}
add_action('wp_default_scripts', 'remove_jquery_migrate');

// Remove oEmbed
remove_action( 'wp_head', 'wp_oembed_add_discovery_links', 10 );
remove_action( 'wp_head', 'wp_oembed_add_host_js' );
remove_action('rest_api_init', 'wp_oembed_register_route');
remove_filter('oembed_dataparse', 'wp_filter_oembed_result', 10);

// Disable Trackbacks and Pings
add_action( 'pre_ping', 'c45_internal_pingbacks' );
add_filter( 'wp_headers', 'c45_x_pingback');
add_filter( 'bloginfo_url', 'c45_pingback_url') ;
add_filter( 'bloginfo', 'c45_pingback_url') ;
add_filter( 'xmlrpc_enabled', '__return_false' );
add_filter( 'xmlrpc_methods', 'c45_xmlrpc_methods' );

// Disable internal pingbacks
function c45_internal_pingbacks( &$links ) {
    foreach ( $links as $l => $link ) {
        if ( 0 === strpos( $link, get_option( 'home' ) ) ) {
            unset( $links[$l] );
        }
    }
}

// Disable x-pingback
function c45_x_pingback( $headers ) {
    unset( $headers['X-Pingback'] );
    return $headers;
}

// Remove pingback URLs
function c45_pingback_url( $output, $show='') {
    if ( $show == 'pingback_url' ) $output = '';
    return $output;
}

// Disable XML-RPC methods
function c45_xmlrpc_methods( $methods ) {
    unset( $methods['pingback.ping'] );
    return $methods;
}

// Disable and Remove Comments functions
add_action('admin_init', function () {
    // Redirect any user trying to access comments page
    global $pagenow;

    if ($pagenow === 'edit-comments.php') {
        wp_redirect(admin_url());
        exit;
    }

    // Remove comments metabox from dashboard
    remove_meta_box('dashboard_recent_comments', 'dashboard', 'normal');

    // Disable support for comments and trackbacks in post types
    foreach (get_post_types() as $post_type) {
        if (post_type_supports($post_type, 'comments')) {
            remove_post_type_support($post_type, 'comments');
            remove_post_type_support($post_type, 'trackbacks');
        }
    }
});

// Close comments on the front-end
add_filter('comments_open', '__return_false', 20, 2);
add_filter('pings_open', '__return_false', 20, 2);

// Hide existing comments
add_filter('comments_array', '__return_empty_array', 10, 2);

// Remove comments page in menu
add_action('admin_menu', function () {
    remove_menu_page('edit-comments.php');
});

// Remove comments links from admin bar
add_action('init', function () {
    if (is_admin_bar_showing()) {
        remove_action('admin_bar_menu', 'wp_admin_bar_comments_menu', 60);
    }
});

// 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' );
    add_filter( 'tiny_mce_plugins', 'disable_emojis_tinymce' );
    add_filter( 'wp_resource_hints', 'disable_emojis_remove_dns_prefetch', 10, 2 );
}
add_action( 'init', 'disable_emojis' );

// Filter function used to remove the tinymce emoji plugin.
function 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 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;
}

// Clean up output of stylesheet <link> tags
function clean_style_tag($input) {
  preg_match_all("!<link rel='stylesheet'\s?(id='[^']+')?\s+href='(.*)' type='text/css' media='(.*)' />!", $input, $matches);
  if (empty($matches[2])) {
    return $input;
  }
  // Only display media if it is meaningful
  $media = $matches[3][0] !== '' && $matches[3][0] !== 'all' ? ' media="' . $matches[3][0] . '"' : '';
  return '<link rel="stylesheet" href="' . $matches[2][0] . '"' . $media . '>' . "\n";
}
add_filter('style_loader_tag', 'clean_style_tag');

// Include optimize-wp.php in functions.php (optional)
if( file_exists( get_theme_file_path("/inc/optimize-wp.php") ) ) {
	include( get_theme_file_path("/inc/optimize-wp.php") );
}

?>