как вывести массив в php?

Пример

var filter;
filters['tour'] = $("#tour_id option:selected").val();
filters['countries'] = $("#country_id option:selected").val();
filters['regions'] = $("#region_id option:selected").val();

$.ajax({
url: 'output.php',
type: 'POST',
data:{
filters:['tour'],
filters:['regions'],
filters:['countries']
},
success: function(data) {
$('.contant').html(data);
}
});