How can PHP sessions be effectively managed to prevent data loss during page navigation?

To prevent data loss during page navigation with PHP sessions, it is important to ensure that session_start() is called at the beginning of each page where session data is needed. Additionally, session_write_close() should be called once session data has been updated to prevent race conditions. Lastly, make sure to properly serialize and unserialize complex data structures stored in session variables. 

<?php
session_start();

// Access session data
$_SESSION['user_id'] = 123;

// Update session data
$_SESSION['cart'] = serialize($cart);

// Close session write
session_write_close();
?>

Keywords

PHP sessions data loss page navigation session management session variables

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