In PHP, what are the drawbacks of storing excessive data in sessions, and how can this impact performance?

Storing excessive data in sessions can lead to increased memory usage and slower performance, as all session data is stored on the server side and needs to be retrieved for each request. To improve performance, only store essential data in sessions and avoid storing large amounts of information. 

// Limit the amount of data stored in sessions
$_SESSION['user_id'] = $user_id;
$_SESSION['username'] = $username;

Keywords

PHP sessions performance memory consumption scalability

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