Filter CPT by

admin-cpt-filter.php

// Add Hospital filter to CPTs (in admin)
// -------------------------------------------------------------
function restrict_people_by_hospital() {
	global $typenow;
	$taxonomy = 'hospital';
	if ($typenow == 'consultant') {
		$selected = isset($_GET[$taxonomy]) ? $_GET[$taxonomy] : '';
		$info_taxonomy = get_taxonomy($taxonomy);
		wp_dropdown_categories(array(
			'show_option_all' => __("All {$info_taxonomy->label}s"),
			'taxonomy' => $taxonomy,
			'name' => $taxonomy,
			'orderby' => 'name',
			'selected' => $selected,
			'show_count' => false,
			'hide_empty' => true,
		));
	};
}

add_action('restrict_manage_posts', 'restrict_people_by_hospital');

function id_conversion_for_hospitals($query) {
	global $pagenow;
	$taxonomy = 'hospital';
	$q_vars = &$query->query_vars;
	if($q_vars['post_type'] == 'consultant'):
		if ($pagenow == 'edit.php' && isset($q_vars[$taxonomy]) && is_numeric($q_vars[$taxonomy]) && $q_vars[$taxonomy] != 0) {
			$term = get_term_by('id', $q_vars[$taxonomy], $taxonomy);
			$q_vars[$taxonomy] = $term->slug;
		}
	endif;
}