Use Repository Hosted jQuery for Wordpress

remote-jquery-for-wordpress.php

<?php
// Load jQuery from Google Lib
if( !is_admin()){
  $url = 'https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js';
  $test_url = @fopen($url,'r');
  if($test_url !== false) {
    function load_external_jQuery() {
      wp_deregister_script('jquery');
      wp_register_script('jquery', 'https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js', '', '', true );
      wp_enqueue_script('jquery');
    }
    add_action('wp_enqueue_scripts', 'load_external_jQuery');
  } else {
    function load_local_jQuery() {
      wp_deregister_script('jquery');
      wp_register_script( 'jquery', includes_url( '/js/jquery/jquery.js' ), false, '', true );
      wp_enqueue_script('jquery');
    }
  add_action('wp_enqueue_scripts', 'load_local_jQuery');
  }
}
?>