Faster admin-ajax.php for WordPress AJAX actions

gistfile1.txt

<?php
define('DOING_AJAX', true);

if ( ! isset( $_POST['action'] ) )
    die('-1');

require_once('../../../../wp-load.php'); 

// headers for JSON
header('Content-Type: application/json');
send_nosniff_header();

// no cache
header('Cache-Control: no-cache');
header('Pragma: no-cache');


$action = esc_attr( trim( $_POST['action'] ) );

// security
$allowed_actions = array(
    'rapid_generate_license',
);

if ( in_array( $action, $allowed_actions ) ) {
    if ( is_user_logged_in() )
        do_action( 'wp_fast_ajax_' . $action );
    else
        do_action( 'wp_fast_ajax_nopriv_' . $action );
} else {
    die('-1');
} 
?>