What are some best practices for managing data within PHP session arrays to avoid data loss?

When managing data within PHP session arrays, it's important to serialize complex data structures before storing them in the session to avoid data loss. This ensures that the data remains intact when retrieved from the session. Additionally, always remember to unserialize the data when accessing it from the session to restore the original structure.

// Serialize data before storing in session
$_SESSION['complex_data'] = serialize($complex_data);

// Unserialize data when accessing from session
$complex_data = unserialize($_SESSION['complex_data']);