gistfile1.txt

/*
 * Random display of properties option
 */

add_filter('propertyhive_default_search_results_orderby', 'change_default_order');
function change_default_order($orderby)
{
    return 'rand';
}

add_filter('propertyhive_results_orderby', 'add_random_to_sort_dropdown');
function add_random_to_sort_dropdown($options)
{
    $options['rand'] = 'Random';
    return $options;
}

add_filter('propertyhive_get_search_results_ordering_args', 'set_to_random_order');
function set_to_random_order($args)
{
    if (isset($_GET['orderby']) && $_GET['orderby'] === 'rand') {
        $args['orderby'] = 'rand';
        $args['meta_key'] = '';
    }

    return $args;
}

function wpb_seeded_random_order($orderby_statement, $query)
{
	if ( is_admin() )
	{
		return $orderby_statement;
	}
	
	if ( !$query->is_main_query() )
	{
		return $orderby_statement;
	}
	
	if ( !is_post_type_archive('property') )
	{
		return $orderby_statement;
	}
	
	if ( isset($_GET['orderby']) && $_GET['orderby'] != 'rand' )
	{
		// ordering by something else
		return $orderby_statement;
	}
	
	$seed = isset($_GET['rand_seed']) ? sanitize_text_field(intval($_GET['rand_seed'])) : rand(1, 999999);
	
	$_GET['rand_seed'] = $seed;
	
	return "RAND($seed)";
}
add_filter('posts_orderby', 'wpb_seeded_random_order', 10, 2);

add_filter('get_pagenum_link', 'preserve_rand_seed_in_pagination_links');
function preserve_rand_seed_in_pagination_links($link)
{
	if ( is_admin() )
	{
		return $link;
	}
	
	if ( !is_post_type_archive('property') )
	{
		return $link;
	}
	
	if ( isset($_GET['orderby']) && $_GET['orderby'] != 'rand' )
	{
		// ordering by something else
		return $link;
	}
	
	$rand_seed = isset($_GET['rand_seed']) ? intval($_GET['rand_seed']) : rand(1, 999999);

	// Add rand_seed to link
	$link = add_query_arg([
		//'orderby'    => 'rand',
		'rand_seed'  => $rand_seed,
	], $link);

    return $link;
}