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You can use array_map like this: $room_types = isset( $_POST['room_types'] ) ? (array) $_POST['room_types'] : array(); $room_types = array_map( 'esc_attr', $room_types ); // Replace esc_attr with your desire sanitization


You shouldn't be using WP_Query at all. The standard loop will automatically display the correct posts. while ( have_posts() ) : the_post(); endwhile;


You can use get_queried_object(), within that object you can get the slug or id.

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