What Are Cookies in PHP?

Cookies are small text files saved in the browser. They store user information for a limited time. For example:

• A cookie can remember your login for the next time you visit.
• It can save the items you add to your cart in an online store.
• It can track your preferences like language or theme.

In PHP, cookies are handled with the setcookie() function.

How to Create Cookies

The basic syntax is:

setcookie(name, value, expire, path, domain, secure, httponly);

• name – The name of the cookie.
• value – The data stored inside the cookie.
• expire – Time (in seconds) after which the cookie will expire.
• path – The path where the cookie is available.
• domain – The domain where the cookie works.
• secure – If true, cookie works only with HTTPS.
• httponly – If true, cookie is accessible only through HTTP, not JavaScript.

Example: Creating a Cookie

<?php
setcookie("username", "Azad", time() + (86400 * 7), "/"); 
?>

This will create a cookie named username with the value Azad. It will last for 7 days.

How to Retrieve Cookies

To get the value of a cookie, use the $_COOKIE superglobal array:

<?php
echo $_COOKIE["username"];
?>

This will show the value stored in the cookie.

How to Delete a Cookie

Deleting a cookie is simple. Just set the expiry time in the past:

<?php
setcookie("username", "", time() - 3600, "/");
?>

This will remove the cookie.

Why Use Cookies in PHP?

• User Experience – They make websites more user-friendly.
• Personalization – Websites can show content based on saved preferences.
• Sessions – Useful in login systems and shopping carts.

Note: Never store sensitive data like passwords in cookies.

Best Practices for Cookies in PHP

1. Use cookies only when needed – Don’t overload users’ browsers.
2. Set expiry wisely – Short expiry for better security.
3. Use httponly and secure flags – Prevent security risks.
4. Respect privacy – Inform users about cookies (GDPR compliance).

Final Thoughts

Cookies in PHP are a simple yet powerful way to store information about users. With just a few lines of code, you can create, read, and delete cookies. They make your website smarter and improve user experience. But always use them responsibly and securely.