datatables search

Well, I needed some help .. I'm using datatables.

I have a search form that when clicking will search to run a php file, where I send parameters by search data, some fields can go in null.

The php file that goes to the database has the following structure

search.php

class dados{ public function getinfo($query,$key,$processo,$sigla,$datainicio,$datafim,$op)

}}

All right until here because I'm generating a json file. that I will read in the datatables this file, but it gets very slow and limited.

I'm already generating json.  I am trying to cede to the file but it does not load me the datatble of the .php file, what will it be?

 $('#pesquisa').dataTable( {        
           "processing": true,
                       "ajax":{
            url :"../../temp/pesquisa.php", // json datasource
            type: "post",