<?php
wp_enqueue_cdn( 'scrollto', 'http://cdnjs.cloudflare.com/ajax/libs/jquery-scrollTo/2.1.0/jquery.scrollTo.min.js', 'load_external_scrollto', 'load_local_scrollto' );
function wp_enqueue_cdn( $name, $get_the_url, $callback, $fallback ){
$transient_name = $name.'_is_up';
if( get_transient( $transient_name ) ){
$load_source = $callback;
}else{
$cdn_response = wp_remote_get( $get_the_url );
if( is_wp_error( $cdn_response ) || wp_remote_retrieve_response_code( $cdn_response ) != '200' ){
$load_source = $fallback;
}else{
set_transient( $transient_name, true, MINUTE_IN_SECONDS * 20 );
$load_source = $callback;
}
}
add_action('wp_enqueue_scripts', $load_source );
}
function load_external_scrollto() {
wp_register_script( 'scrollto', 'http://cdnjs.cloudflare.com/ajax/libs/jquery-scrollTo/2.1.0/jquery.scrollTo.min.js', array('jquery'), 3.3, true );
wp_enqueue_script( 'scrollto' );
}
function load_local_scrollto() {
wp_register_script( 'scrollto', get_stylesheet_directory_uri() . '/assets/jquery.scrollTo.min.js', __FILE__, array('jquery'), 3.3, true );
wp_enqueue_script( 'scrollto' );
}