Wordpress: Lightweight frontend-ajax alternative to admin-ajax.php

<?php /** * Lightweight frontend ajax alternative to admin-ajax.php * Modified from admin-ajax.php @ v4.4.1 * * @author Michael Niles <codepad@blindmikey.com> * @version 1.0.0 */ /** Executing AJAX process. */ define( 'DOING_AJAX', true ); /* * Optionally get even more lightweight and require only * what you need after wp-load.php * * https://core.trac.wordpress.org/browser/branches/3.4/wp-settings.php#L99 */ // define('SHORTINIT', true); /** * Load WordPress Bootstrap * assumes file is in theme root. Adjust as needed */ require_once( '../../../wp-load.php' ); // if SHORTINIT add your require_once()'s here /** Allow for cross-domain requests (from the frontend). */ send_origin_headers(); /** Require an action parameter */ if ( empty( $_REQUEST['action'] ) ) die( '0' ); /** Setup headers */ @header( 'Content-Type: text/html; charset=' . get_option( 'blog_charset' ) ); @header( 'X-Robots-Tag: noindex' ); /** Send a HTTP header to disable content type sniffing in browsers which support it. */ send_nosniff_header(); /** Set headers to prevent caching for browsers. */ nocache_headers(); /** * Optionally allow only specific actions */ /* $approved_actions = array( 'action_one', 'action_two', ); if( ! in_array( esc_attr( trim( $_REQUEST['action'] ) ), $approved_actions ) ) die( '0' ); */ /** Register Ajax calls. */ if ( is_user_logged_in() ) { do_action( 'wp_ajax_' . $_REQUEST['action'] ); } else { do_action( 'wp_ajax_nopriv_' . $_REQUEST['action'] ); } /** Default status */ die( '0' );