What are the potential pitfalls of using cookies in PHP applications for storing user information?

Potential pitfalls of using cookies in PHP applications for storing user information include security risks such as cookie tampering, session hijacking, and sensitive data exposure. To mitigate these risks, sensitive user information should not be stored directly in cookies. Instead, use cookies to store a session identifier and store the actual user data securely on the server side. 

// Set a session identifier in a cookie
session_start();
$_SESSION['user_id'] = $user_id;
$session_id = session_id();
setcookie('session_id', $session_id, time() + (86400 * 30), '/');

// Store user data securely on the server side
$user_data = getUserData($user_id);
$_SESSION['user_data'] = $user_data;

Keywords

cookies PHP applications user information security vulnerabilities data leakage

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