Cách lấy header PHP nhận từ trình duyệt

Dòng mã dưới dùng để hiển thị header PHP nhận qua trình duyệt:

<?php print_r($_SERVER[URL]) ?>

hoặc

Ví dụ

$headers = getallheaders(); 
foreach($headers as $key => $val){ 
    echo $key . ': ' . $val . '
'; 
}

Kết quả

Host: www.websitename.com 
Content-Length: 180 
Cache-Control: max-age=0 
Origin: https://www.websitename.com 
Upgrade-Insecure-Requests: 1 
Content-Type: application/x-www-form-urlencoded 
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 
Referer: https://www.writephponline.com/ 
Accept-Encoding: gzip, deflate 
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8 
Cookie: _ga=GA1.2.118418268.1575911248; _gid=GA1.2.1794052867.1576852059