<!DOCTYPE html> <html> <body> <form method="post" action="https://www.cainiaomax.com/php/%3C?php%20echo%20$_SERVER%5B'PHP_SELF'%5D;?%3E"> Name: <input type="text" name="fname"> <input type="submit"> </form> <?php if ($_SERVER["REQUEST_METHOD"] == "POST") { // collect value of input field $name = $_POST['fname']; if (empty($name)) { echo "Name is empty"; } else { echo $name; } } ?> </body> </html>