What are the potential risks of using browser data for session validation in PHP?

Storing session validation data in the browser can expose it to potential security risks such as session hijacking or manipulation. To mitigate these risks, it is recommended to store session validation data on the server side instead of relying solely on browser data. 

// Start a session
session_start();

// Generate a random token for session validation
$token = bin2hex(random_bytes(16));

// Store the token in the session data
$_SESSION['token'] = $token;

// Validate session by comparing token with session data
if ($_SESSION['token'] !== $_POST['token']) {
    // Invalid session, handle accordingly
}

Keywords

security risks session hijacking cross-site scripting data validation PHP cookies

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