WordPress Sorting WP_QUERY results by multiple meta keys

WordPress WP_QUERY Meta Key Sorter

<?php
$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
		
$args = array( 
	'post_type'       => 'product',
	'posts_per_page'  => POSTS_PER_PAGE,
	'paged'           => $paged,
	'meta_query'      => array(
		'relation'    => 'AND',
		'price'    => array(
			'key'     => 'price',
			'type'    => 'NUMERIC',
			'compare' => 'EXISTS',
		),
		'rating'   => array(
			'key'     => 'rating',
			'type'    => 'NUMERIC',
			'compare' => 'EXISTS',
		),
	)
);

$sort = isset( $_GET['sort'] ) ? esc_attr( $_GET['sort'] ) : 'most-recent';	

switch( $sort ) 
{
	case 'most-recent':
		$args['orderby']  = array( 
			'date'   => 'DESC',
			'rating' => 'DESC'
		);
		break;
		
	case 'price-high':
		$args['orderby'] = array(
			'price'    => 'DESC',
			'rating' => 'DESC'
		);
		break;
		
	case 'price-low':
		$args['orderby'] = array(
			'price'    => 'ASC',
			'rating' => 'DESC'
		);
		break;
		
	case 'rating-high':
		$args['orderby'] = array(
			'rating' => 'DESC',
			'price'    => 'ASC'
		);
		break;
		
	case 'rating-low':
		$args['orderby'] = array(
			'rating' => 'ASC',
			'price'    => 'ASC'
		);
		break;
}

$results = new WP_Query( $args );
?>