Get Current Post ID in functions php, meta query filter

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You need to simply pass your current page with your ajax request.

Put this property on your “body” tag to be able to get this with JS in the future.

<body page-id="<?php get_the_ID(); ?>">

Find it in your JS

var page_id = $('body').attr("page-id")

Pass it along with your other “data”:

var data = {
   action : "my_ajax_filter_search",
   project_type : project_type,
   page_id: page_id
}