$GET outside/parent page

This may be a bit confusing, but this is what I have so far.

I have a parent page, which uses JQuery.load() to load into it a child php page. This parent page has the url: localhost/piproject/roster.php?id=2

Inside of my child php page, I want to access that id#, however $_GET["id"] is null because the child page actually has it's own sub-url (not the technical term).

I want to have that child page refresh without affecting the parent page, so I am using setInterval() on my function which does the .load(). How can I achieve this functionality, and also be able to access the page id?


You can print the id into a javascript variable on the parent page.

    var pageId = <?= $_GET['id'] =>;   // integer
    var pageId = "<?= $_GET['id'] =>"; // string

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