Wordpress/wp-ajax.php

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<?php
/**
* Execute an AJAX action.
*
* To take full advantage of this file, call wp_ajaxurl(); in your theme
* or plugin while registering your front-end scripts. Doing so will make
* an ajaxurl variable available for use in javascripts. The ajaxurl
* variable will point to this file's absolute URL.
*
* In the admin area, an ajaxurl variable is always available, and points
* to wp-admin/admin-ajax.php instead.
*
* @since 3.0
*/
define('DOING_AJAX', true);
require_once('wp-load.php');
@header('Content-Type: text/html; charset=' . get_option('blog_charset'));
send_nosniff_header();
do_action('ajax_init');
$hook = !empty($_REQUEST['action']) ? 'ajax_' . $_REQUEST['action'] : false;
if ( empty($hook) || ! has_action($hook) ) {
status_header(400);
exit;
}
do_action($hook);
?>