codeigniter形式响应为json

In my codeigniter application I have a form in my views and I want to pass the responses received from this form in json format for further use. Can anyone guide me on steps to do the same please

This code might help

 $arr=['name'=>'Ankita','education'=>'Graduate'];

 $json=json_encode($arr);

 var_dump($json);

The result would be

string(40) "{"name":"Ankita","education":"Graduate"}"