Closing Sessions
In some instances, for example when a user logs out, all session data should be removed, and the session must be closed. Of course, it would be possible to loop through $_SESSION with foreach and then set each value to an empty string or null, but there is a quicker way: Call session_destroy(). After that, all data in the current session is destroyed, as the function name suggests.
Removing All Session Data (session_destroy.php)
<?php
session_start();
echo 'Before: <pre>';
print_r($_SESSION);
echo '</pre>After: <pre> ';
session_destroy();
print_r($_SESSION);
echo '</pre>';
?>
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