Updated:
This does not work because:
$myphpvar = "<script>document.write(localStorage.getItem('myjsvar'));</script>";
Your PHP variable now $myphpvarcontains:
<script>document.write(localStorage.getItem('myjsvar'));</script>
when you are echo, it looks like:
echo "<script>document.write(localStorage.getItem('myjsvar'));</script>"
Js, .
SQL: :
$sql="INSERT INTO `pending` (`id`, `myfield`) VALUES ('', '<script>document.write(localStorage.getItem('myjsvar'));</script>')";
localStorage URL PHP AJAX !
window.location.href = window.location.href+"?local="+localStorage.getItem('myjsvar'));