PHP Sessions | asadmukhtar.info

PHP Sessions | asadmukhtar.info

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PHP Sessions 🛠️

A PHP session is a way to store information (variables) across multiple pages. Unlike cookies, session data is stored on the server, making it more secure.

How PHP Sessions Work?

1️⃣ A session starts using session_start().
2️⃣ Data is stored in the $_SESSION superglobal.
3️⃣ The data can be accessed across multiple pages.
4️⃣ The session ends when the user closes the browser or manually destroys it.

Starting a Session

Before using sessions, you must start them at the top of your script:

session_start(); // Must be called before any output

Storing Data in a Session

session_start();
$_SESSION["username"] = "JohnDoe"; 
$_SESSION["email"] = "john@example.com";
echo "Session variables are set.";

Accessing Session Data on Another Page

session_start();
echo "Welcome, " . $_SESSION["username"];

Destroying a Session

To delete all session data, use session_destroy():

session_start();
session_destroy();
echo "Session destroyed!";

🔹 If you only want to remove specific session variables, use unset():

unset($_SESSION["username"]);

Why Use Sessions?

✔ Secure (stored on the server) 🔐
✔ Stores large amounts of data 📦
✔ Used for user authentication and login systems 🔑

PHP sessions are essential for building dynamic and interactive web applications, ensuring users remain authenticated across multiple pages.