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PHP Sessions

Sessions in PHP are used to store information about a user across multiple pages. Unlike cookies, session data is stored on the server, making it more secure.

Starting a Session

<?php
session_start(); // Start the session
?>

Explanation: This code snippet starts a session. It must be called before any output is sent to the browser.

Storing Session Variables

<?php
session_start();
$_SESSION["username"] = "JohnDoe"; // Store session variable
?>

Explanation: This example stores a session variable named username with the value JohnDoe.

Retrieving Session Variables

<?php
session_start();
if(isset($_SESSION["username"])) {
    echo "Username: " . $_SESSION["username"];
} else {
    echo "Username is not set.";
}
?>

Explanation: This example checks if the username session variable is set and retrieves its value. If not set, it displays a message indicating that.

Destroying a Session

<?php
session_start();
session_unset(); // Unset all session variables
session_destroy(); // Destroy the session
?>

Explanation: This example unsets all session variables and destroys the session.

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