What are the potential limitations of using cookies for storing user-specific data in PHP?

One potential limitation of using cookies for storing user-specific data in PHP is that they can be easily manipulated by users, leading to security risks such as data tampering or theft. To mitigate this risk, sensitive data should not be stored directly in cookies. Instead, a more secure approach would be to store a unique identifier in the cookie and associate the user-specific data with that identifier in a server-side session. 

// Set a unique identifier in the cookie
$unique_id = uniqid();
setcookie('user_id', $unique_id, time() + (86400 * 30), '/');

// Store user-specific data in a server-side session
$_SESSION[$unique_id] = [
    'username' => 'example_user',
    'email' => 'user@example.com'
];

Keywords

cookies limitations user-specific data PHP data storage

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