javascript - sessionStorage.clear() not working -

i'm using sessionstorage in project, 1 caveat: can't eliminate storage clear() operator, documented.

i'm doing when logging out of administrative mode of site, involves clicking on log out item in list, this:

<li><a href="admin_logout.php">log out</a></li> 

the admin_logout.php file destroys session variables, etc., , redirects home page of site. previous form, works, is:

<?php session_start(); session_destroy(); @header('location:./'); exit; ?> 

that works fine. can't seem integrate routine clearing sessionstorage. text of admin_logout.php file, i've tried:

<?php session_start(); ?>  <script> sessionstorage.clear(); </script>  <?php session_destroy(); @header('location:./'); exit; ?> 

...as as:

<?php session_start();  echo '<script>'; echo 'sessionstorage.clear();'; echo '</script>';  session_destroy(); @header('location:./'); exit; ?> 

perhaps pointing root cause when i've placed:

?> <script> alert("hello"); </script> <?php 

...within script, alert never executed, yet else is. how can invoke <script> based sessionstorage.clear() operation clear session storage items within routine listed above?

i think it's because you're redirecting on server-side , sessionstorage.clear() happening on client side. believe you're redirecting before gets chance run.