A cookie is often used to identify a user. A cookie is a small file that the server embeds on the user's computer. Each time the same computer requests a page with a browser, it will send the cookie too.
Use the setcookie() function.
setcookie(name, value, expire, path, domain, secure, httponly);
Important: The setcookie() function must appear BEFORE the <html> tag.
Edit the code below and click Run to see the result live.