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How does using sessions compare to using cookies for maintaining user login status in PHP?

Using sessions is generally more secure and convenient than using cookies for maintaining user login status in PHP. Sessions store user data on the server side, making it less vulnerable to tampering by the user. Additionally, sessions automatically handle the creation and management of session IDs, simplifying the process for developers.

php 
// Start a session
session_start();

// Set session variables
$_SESSION['user_id'] = $user_id;

// Check if user is logged in
if(isset($_SESSION['user_id'])) {
    // User is logged in
} else {
    // User is not logged in
}

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