What are the best practices for maintaining SESSION variables in PHP applications?

To maintain SESSION variables in PHP applications, it is important to ensure proper security measures are in place to prevent session hijacking or tampering. This includes using HTTPS, regenerating session IDs, and validating user input before storing it in the session. Additionally, it is recommended to unset or destroy session variables when they are no longer needed to free up server resources. 

// Start or resume session
session_start();

// Regenerate session ID to prevent session fixation
session_regenerate_id(true);

// Validate and sanitize user input before storing in session
$_SESSION['user_id'] = filter_var($_POST['user_id'], FILTER_SANITIZE_NUMBER_INT);

// Unset session variable when no longer needed
unset($_SESSION['user_id']);

Keywords

session variables security PHP functions data persistence session hijacking

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