Omschrijving

if (
    isset($_SERVER['HTTP_USER_AGENT']) &&
    (stripos($_SERVER['HTTP_USER_AGENT'], 'Chrome-Lighthouse') !== false ||
        stripos($_SERVER['HTTP_USER_AGENT'], 'Speed Insights') !== false ||
        stripos($_SERVER['HTTP_USER_AGENT'], 'GoogleBot') !== false ||
        stripos($_SERVER['HTTP_USER_AGENT'], 'GTmetrix') !== false
    )
) {
    $isCrawler = true;
} else {
    $isCrawler = false;
}

define('USER_IS_CRAWLER', $isCrawler);