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get id by using slug

paste this function in function.php

function get_id_by_slug($page_slug) {
	$page = get_page_by_path($page_slug);
	if ($page) {
		return $page;
	} else {
		return null;
	}
}

example:
get_id_by_slug(‘about-us’);

get slug by id

global $post;
$slug = get_post( $post )->post_name;
echo $slug;
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