javascript - best way to save sessionStorage before a header -


i want save sessionstorage item if rowcount happens 0, know shouldn't echoing before header, hence, please let me know best way set sessionstorage before headering on conditions. js , php, dont want use jquery. in advance !

                <?php                 $admin_table = "admin_table";                 $show_all_admins = "select * $admin_table";                 $show_all_admins_query = mysqli_query($conn, $show_all_admins);                 $rowcount = mysqli_num_rows($show_all_admins_query);                 if($rowcount == 0 ){                     mysqli_close($conn);                     echo'<script>sessionstorage.setitem("admin_sessn", "admins");</script>';                     header('location: http://localhost/littlesidegym.php');                     exit();                     }                 ?>

one option handle redirect in javascript instead of php

<script>     sessionstorage.setitem("admin_sessn", "admins");     window.location = 'http://localhost/littlesidegym.php'; </script>

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