I'm using sessionStorage successfully in a project, with one caveat: I can't eliminate the storage with the clear() operator, as documented.
I'm doing this when logging out of the administrative mode of my site, which involves clicking on a Log Out item in a list, like this:
<li><a href="admin_logout.php">Log Out</a></li>
The admin_logout.php file then destroys session variables, etc., and then redirects to the home page of the site. Its previous form, which works, is:
<?php
session_start();
session_destroy();
@header('Location:./');
exit;
?>
That all works fine. What I can't seem to integrate into the routine is clearing the sessionStorage. For the text of my admin_logout.php file, I've tried:
<?php
session_start();
?>
<script>
sessionStorage.clear();
</script>
<?php
session_destroy();
@header('Location:./');
exit;
?>
...as well as:
<?php
session_start();
echo '<script>';
echo 'sessionStorage.clear();';
echo '</script>';
session_destroy();
@header('Location:./');
exit;
?>
Perhaps pointing to the root cause is that when I've placed:
?>
<script>
alert("HELLO");
</script>
<?php
...within this script, the alert is never executed, yet everything else is. How can I invoke the <script> based sessionStorage.clear() operation to clear my session storage items within the routine listed above?
I think it's because you're redirecting on the server-side and the sessionStorage.clear() is happening on the client side. I believe you're redirecting before that gets a chance to run.