How to respond with json?

Question

PHP

Hello everyone)
There is a server in php
There is an ios application that expects a json response from the server
The server responds like this:
echo json_encode($data);
But
on ios the header comes that the answer is {text/html}
I understand that this echo is to blame
Tell me how to make it so that json comes, i.e. in the headers there should be {text/json}

Answer 1

mmm ... specify this same header() in the answer?
header('Content-Type: application/json');