How to get out of loop in json?

Question

JSON

Greetings.
There is this simple array traversal:
foreach ($cities as $city) {
if ($city['country_code'] == "$iata")
foreach ($city as $key => $value) {
$lat = $city ['coordinates']['lat'];
$lng = $city['coordinates']['lon'];
}
}
How to convert the result of the work to json?
{"lat":value,"lng":value}, {"lat":value,"lng":value}, etc.
It is clear that in the end using json_encode, but how exactly to pass the values?
Thank you.

Answer 1

var j = JSON.stringify(arr);