Disable XMLRPC API & Pingback for Wordpress

functions.php

/**
Disable XMLRPC API in Wordpress

This line of code does effectively the same thing as 
this plugin: https://wordpress.org/plugins/disable-xml-rpc/

NOTE: If you are using JetPack plugin, this will not work.

Add these lines to the functions.php file:
**/

add_filter(‘xmlrpc_enabled’, ‘__return_false’);

// Disable X-Pingback to header
add_filter( 'wp_headers', 'disable_x_pingback' );

function disable_x_pingback( $headers ) {
  unset( $headers['X-Pingback'] );
  return $headers;
}