jxxe/remove-meta-wordpress.php

## remove-meta-wordpress.php
<?php
// remove some meta tags from WordPress
remove_action('wp_head', 'wp_generator');
function remove_dns_prefetch( $hints, $relation_type ) {
    if ( 'dns-prefetch' === $relation_type ) {
        return array_diff( wp_dependencies_unique_hosts(), $hints );
    }

    return $hints;
}
remove_action ('wp_head', 'rsd_link');
remove_action( 'wp_head', 'wlwmanifest_link');
remove_action( 'wp_head', 'wp_shortlink_wp_head');

//remove json api capabilities
function remove_json_api () {

    // Remove the REST API lines from the HTML Header
    remove_action( 'wp_head', 'rest_output_link_wp_head', 10 );
    remove_action( 'wp_head', 'wp_oembed_add_discovery_links', 10 );

    // Remove the REST API endpoint.
    remove_action( 'rest_api_init', 'wp_oembed_register_route' );

    // Turn off oEmbed auto discovery.
    add_filter( 'embed_oembed_discover', '__return_false' );

    // Don't filter oEmbed results.
    remove_filter( 'oembed_dataparse', 'wp_filter_oembed_result', 10 );

    // Remove oEmbed discovery links.
    remove_action( 'wp_head', 'wp_oembed_add_discovery_links' );

    // Remove oEmbed-specific JavaScript from the front-end and back-end.
    remove_action( 'wp_head', 'wp_oembed_add_host_js' );

}
add_action( 'after_setup_theme', 'remove_json_api' );

//completely disable json api
function disable_json_api () {

  // Filters for WP-API version 1.x
  add_filter('json_enabled', '__return_false');
  add_filter('json_jsonp_enabled', '__return_false');

  // Filters for WP-API version 2.x
  add_filter('rest_enabled', '__return_false');
  add_filter('rest_jsonp_enabled', '__return_false');

}
add_action( 'after_setup_theme', 'disable_json_api' );

// Remove auto generated feed links
function my_remove_feeds() {
  remove_action( 'wp_head', 'feed_links_extra', 3 );
  remove_action( 'wp_head', 'feed_links', 2 );
}
add_action( 'after_setup_theme', 'my_remove_feeds' );

add_filter( 'wp_resource_hints', 'remove_dns_prefetch', 10, 2 );

//remove emoji scripts from head
remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
remove_action( 'wp_print_styles', 'print_emoji_styles' );
?>