将javascript数组发送到php Yii页面

I want to pass JavaScript array to PHP using ajax. the status in Network is 200 and everything is ok but i got erorr Here is the code. data is array:

$.ajax({
    type : "POST",
    url: '?r=site/mahsulat',
     dataType: "json",
        data : JSON.stringify({ 
        'arra' :arr
    }),

    success :  function(data) {
        alert(data);
      window.location = '?r=site/mahsulat' 
    },
    error : function (data){
        alert('Error');
    }