What are the potential pitfalls of storing multidimensional arrays in $_SESSION in PHP?

Storing multidimensional arrays in $_SESSION can lead to increased memory usage and slower performance, as the entire array must be serialized and deserialized on each request. To mitigate this, consider storing only the necessary data in $_SESSION and using a database or caching system for larger datasets. 

// Example of storing only necessary data in $_SESSION
$_SESSION['user_id'] = 123;
$_SESSION['user_name'] = 'John Doe';

Keywords

$_SESSION multidimensional arrays serialization session data loss memory consumption

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